{"id":1955,"date":"2016-05-13T16:24:24","date_gmt":"2016-05-13T23:24:24","guid":{"rendered":"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1955"},"modified":"2026-04-16T09:49:20","modified_gmt":"2026-04-16T16:49:20","slug":"nematodes","status":"publish","type":"post","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1955","title":{"rendered":"Nematodes"},"content":{"rendered":"<h5>(Plant Parasitic Nematodes)<\/h5>\n<p>Nematodes (also called \u2018roundworms\u2019) are relatively small, multicellular, worm-like animals. They are found in almost every environmental niche imaginable, living free in soil, marine and freshwater habitats while feeding on bacteria, fungi, and nematodes, or as parasites of humans, insects, fish, larger animals and plants.<\/p>\n<p>Plant parasitic nematodes are abundant in many soils and may be feed on roots and other below ground plant tissue as external feeders while living outside a plant or penetrate and enter plant tissue to live and feed internally causing damage to plants. While most species of plant parasitic nematodes feed on below ground plant tissue, a relatively fewer number may inhabit and feed on above ground tissue. Billions of dollars in losses to agricultural crops due to damages caused by plant parasitic nematodes occur worldwide every year. California\u2019s agricultural industry could lose several hundred million dollars annually in crop losses if certain plant parasitic nematodes not known to occur or of limited occurrence in California would become widespread within the State.<\/p>\n<p><span style=\"font-size: 22px; font-weight: bold;\">PEST RATING PROPOSALS:<\/span><\/p>\n<h5><span style=\"color: #339966;\">\u21d2<\/span> NEMATODES:<\/h5>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14531\"><em>Pratylenchus pratensis <\/em>(de Man) Filipjev, 1936 Meadow nematode<\/a><br \/>\nCurrent Pest Rating: None<br \/>\n<strong>Proposed Pest Rating: A<\/strong><br \/>\n<span style=\"color: #ff0000;\">Comment Period: 04\/16\/2026 \u2013 05\/31\/2026<\/span><\/p>\n<p><span style=\"font-size: 22px; font-weight: bold;\">PEST RATINGS:<\/span><\/p>\n<h5><span style=\"color: #339966;\">\u21d2<\/span> Nematodes:<\/h5>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9251\">Anguina agrostis <\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9251\">(Steinbuch, 1799) Filipjev, 1936 Bent grass seed gall nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: B<\/strong><\/p>\n<p><em><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=3728\">Anguina funesta<\/a><\/em><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10440\"><em>Anguina pacificae <\/em>Cid del Prado Vera &amp; Maggenti 1984 Pacific shoot-gall nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=3446\"><em>Anguina tritici<\/em> | Wheat Seed gall nematode<\/a><br \/>\n<strong>Pest Rating: A\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8510\"><em><i>Aphelenchoides besseyi <\/i><\/em>Christie, 1942 (Allen, 1952) Strawberry summer crimp nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9109\"><em>Aphelenchoides fragariae<\/em> (Ritzema &#8211; Bos, 1891) Christie, 1932 Strawberry crimp nematode, Strawberry spring dwarf nematode, Foliar nematode<\/a><br \/>\n<strong>Pest Rating: C <\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14412\"><em>Aphelenchoides oryzae<\/em> Yokoo, 1948<\/a><br \/>\nRice leaf nematode<strong><br \/>\nPest Rating: B<br \/>\n<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6947\"><em>Aphelenchoides ritzemabosi <\/em>(Schwartz, 1911) Steiner &amp; Buhrer 1932<\/a><br \/>\n<strong>Pest Rating: C\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/strong><\/p>\n<p><a href=\"http:\/\/wp.me\/p5l8vQ-b4\">Asian Citrus Root-knot Nematodes<\/a><br \/>\n<strong>Pest Rating: \u00a0A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7903\"><em>Belonolaimus longicaudatus <\/em>Rau, 1958\u00a0Sting nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11615\"><i>Bitylenchus maximus<\/i> (Allen, 1955) Siddiqi, 1986 Stunt nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><em><a href=\"http:\/\/wp.me\/p5l8vQ-jo\">Bursaphelenchus coccophilus\u00a0<\/a><\/em><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13227\"><em>Bursaphelenchus mucronatus <\/em>Mamiya and Enda, 1979 pine wood nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8871\"><em>Bursaphelenchus xylophilus<\/em> (Steiner &amp; Bruhrer, 1934) Nickle, 1970 Pine wilt disease<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9143\"><em>Cactodera cacti<\/em> (Filipjev &amp; Schuurmans Stekhoven, 1941 Krall &amp; Krall, 1978 Cactus cyst nematode)<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6394\"><em>Criconemoides (syn. Criconemella<\/em> De Grisse and Loof<em> 1965), <\/em>Taylor 1936<\/a><br \/>\n<strong><span style=\"color: #000000;\">Pest Rating: C\u00a0<\/span><\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2649\"><em>Ditylenchus destructor<\/em> Thourne, 1945<\/a><br \/>\n<strong>Pest Rating:\u00a0A<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=5680\"><em>Ditylenchus dipsaci<\/em> (K\u00fchn, 1857) Filipjev, 1936<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8729\"><em>Dolichodorus heterocephalus<\/em> Cobb, 1914 Cobb&#8217;s awl nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8508\"><i>Globodera pallida<\/i> (Stone 1973) Behrens Pale cyst nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8502\"><i>Globodera rostochiensis<\/i> Wollenweber 1923 Golden nematode<\/a><br \/>\n<strong>Pest Rating: A\u00a0<\/strong><\/p>\n<p><a href=\"http:\/\/wp.me\/p5l8vQ-wJ\"><em>Helicotylenchus<\/em> spp.<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=382\"><em>Helicotylenchus multicinctus<\/em><\/a><br \/>\n<strong>Pest Rating: \u00a0B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9046\"><em>Hemicriconemoides chitwoodi <\/em> Esser, 1960 Sheathoid nematode<\/a><br \/>\n<strong>Pest Rating: C\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9094\"><em>Hemicriconemoides spp. <\/em>Chitwood &amp; Birchfield, 1957 Sheathoid nematodes<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><em><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2749\">Hemicycliophora arenaria<\/a><\/em><br \/>\n<strong>Pest Rating: B\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8257\"><em><i>Heterodera australis <\/i><\/em>Subbotin, Sturhan, Rumpenhorst &amp; Moens, 2002 Australian cereal cyst nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8151\"><em><i>Heterodera avenae <\/i><\/em>Wollenweber, 1924 European cereal cyst nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=3576\"><em>Heterodera carotae<\/em> Jones, 1950<\/a><br \/>\n<strong>Pest Rating: B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=12649\"><em>Heterodera ciceri <\/em>Vovlas, Greco &amp; Di Vito, 1985 Chickpea cyst nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11619\"><i>Heterodera cruciferae <\/i>Franklin, 1945 Cabbage cyst nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9615\"><em>Heterodera fici <\/em>Kirjanova, 1954 Fig cyst nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8232\"><i>Heterodera filipjevi <\/i>(Madzhidov, 1981) Stelter, 1984 Filipjev&#8217;s cereal cyst nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8486\"><i>Heterodera glycines<\/i> Ichinohe, 1952 Soybean cyst nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13703\"><em>Heterodera latipons <\/em>Franklin, 1969 Mediterranean cereal cyst nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8932\"><em>Heterodera mani<\/em> Mathews, 1971 Rye grass cyst nematode<\/a><br \/>\n<strong>Pest Rating: B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11043\"><em>Heterodera schachtii\u00a0<\/em>A. Schmidt, 1871 Sugarbeet cyst nematode\u00a0<\/a>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<strong>Pest Rating: C<br \/>\n<\/strong><\/p>\n<p><strong>\u00a0<\/strong><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8352\"><i>Heterodera sturhani <\/i>Subbotin 2015 Sturhan cereal cyst nematode<\/a>\u00a0<i><br \/>\n<\/i><strong>\u00a0Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11771\"><i>Heterodera trifolii <\/i>Goffart, 1932 clover cyst nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8664\"><i>Heterodera ustinovi\u00a0<\/i>Kirjanova, 1969 Ustinov&#8217;s grass cyst nematode<\/a> <i><br \/>\n<\/i><strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6412\"><em>Hirschmanniella belli <\/em>Sher 1968<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6416\"><em>Hirschmanniella diversa <\/em>Sher 1968<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13450\"><em>Hirschmanniella oryzae<\/em> (van Breda de Haan, 1902) Luc &amp; Goodey,1964 rice root nematode<\/a><br \/>\n<strong>Pest Rating: A\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14216\"><em>Hoplolaimus floridensis <\/em>Subbotin et al., 2025<\/a><br \/>\nFlorida lance nematode<br \/>\n<strong>\u00a0Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9852\"><em>Hoplolaimus galeatus<\/em> (Cobb, 1913) Filipjev &amp; Schuurmans Stekh Lance nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14237\"><em>Hoplolaimus seinhorsti <\/em>Luc, 1958 Lance nematode<\/a><span style=\"color: #ff0000;\"><br \/>\n<\/span><strong>\u00a0Rating: A<\/strong><span style=\"color: #ff0000;\"><br \/>\n<\/span><\/p>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9039\">Longidorus africanus <\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9039\">Merny, 1966 Needle nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"http:\/\/wp.me\/p5l8vQ-bQ\"><em>Longidorus elongatus: <\/em>Needle nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: \u00a0B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14400\"><em>Longidorus macrosoma <\/em>Hooper, 1961 needle nematode<\/a><strong><br \/>\nPest Rating: A<br \/>\n<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11802\"><i>Longidorus orientalis <\/i>Loof, 1982 Needle nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10641\"><em>Meloidogyne arenaria <\/em>(Neal) Chitwood, 1949 Peanut root-knot nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><span style=\"color: #ff0000;\">\u00a0<\/span><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=12613\"><em>Meloidogyne artiellia<\/em> Franklin (1961) British root-knot nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><span style=\"color: #ff0000;\">\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7031\"><em>Meloidogyne chitwoodi <\/em>Golden, O&#8217;Bannon, Santo &amp; Finley, 1980 Columbia root-knot nematode<\/a><br \/>\n<strong>Pest Rating: B\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2376\"><em>Meloidogyne enterolobii<\/em> Yang and Eisenback, 1983.<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11688\"><i>Meloidogyne fallax <\/i>Karssen, 1996 False Columbia root-knot nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=5666\"><em>Meloidogyne floridensis<\/em> Handoo et al., 2004<\/a><br \/>\n<strong>Pest Rating: A <\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14189\"><em>Meloidogyne graminicola <\/em>Golden &amp; Birchfield 1965 Rice root-knot nematode<\/a><strong><br \/>\nPest Rating: A<br \/>\n<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13579\"><em>Meloidogyne graminis <\/em>(Sledge &amp; Golden) Whitehead 1968 Grass root-knot nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6686\"><em>Meloidogyne hapla <\/em>Chitwood, 1949 Northern Root-Knot Nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: C\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8635\"><i>Meloidogyne haplanaria <\/i>Eisenback et al. 2003 Texas peanut root-knot nematode<\/a><i><br \/>\n<\/i><strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9297\"><em>Meloidogyne hispanica\u00a0<\/em>Hirschmann 1986 Seville root-knot nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8300\"><i>Meloidogyne incognita <\/i>(Kofoid &amp; White, 1919) Chitwood 1949 Southern root-knot nematode<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11182\"><i>Meloidogyne javanica <\/i>(Treub, 1885) Chitwood, 1949 Javanese root-knot nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11804\"><i>Meloidogyne mali<\/i> Itoh, Oshima &amp; Ichinohe 1969 apple root-knot nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6436\"><em>Meloidogyne marylandi <\/em>Jepson and Golden, 1987<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=12880\"><em>Meloidogyne minor<\/em> Karssen et al. 2004<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11323\"><i>Meloidogyne naasi<\/i> Franklin 1965 Barley root knot nematode<\/a><br \/>\n<strong>Pest Rating: B<\/strong><\/p>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9257\">Meloidogyne paranaensis <\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9257\">Carneiro et al. 1996 Parana coffee root-knot nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6399&amp;preview=true\"><em>Merlinius <\/em>spp. (Allen 1955) Siddiqi, 1970<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C\u00a0<\/strong><\/span><\/p>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7781\">Mesocriconema (Macroposthonia) xenoplax <\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7781\">(Raski)<\/a><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7781\"> Loof &amp; de Grisse 1989 ring nematode<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13480\"><em>Nacobbus aberrans<\/em> (Thorne, 1935) Thorne &amp; Allen, 1944 (sensu lato) False root-knot nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9519\"><em>Nanidorus spp. <\/em>Siddiqi, 1974 Stubby root nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6425\"><em>Paratrichodorus minor<\/em> (Colbran, 1956) Siddiqi, 1974<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C\u00a0 \u00a0<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6408\"><em>Paratrichodorus porosus<\/em> (Allen, 1957) Siddiqi, 1974<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C\u00a0<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6389\"><em>Paratrichodorus<\/em> spp. (Siddiqi 1974) and <em>Trichodorus<\/em> spp. (Cobb 1913)<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=3199\"><em>Paratylenchus<\/em> spp. Micoletzky, 1922<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><em><a href=\"http:\/\/wp.me\/p5l8vQ-gn\">Pratylenchus alleni\u00a0<\/a><br \/>\n<\/em><strong>Pest Rating: \u00a0A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=12390\"><i>Pratylenchus brachyurus <\/i>(Godfrey, 1929) Filipjev &amp; Schuurmans-Stekhoven, 1941 smooth-headed lesion nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2208\"><em>Pratylenchus coffeae\u00a0<\/em><\/a><br \/>\n<strong>Pest Rating: B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11822\"><i>Pratylenchus crenatus<\/i> Loof 1960 Root lesion nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7889\"><em>Pratylenchus hippeastri<\/em> (Inserra et al., 2007) Amaryllis lesion nematode<\/a><br \/>\n<strong>Pest Rating: B <\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13889\"><em>Pratylenchus loosi <\/em>Loof, 1960 Tea lesion nematode<\/a><strong><br \/>\nPest Rating: A<br \/>\n<\/strong><\/p>\n<p><em><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1436\">Pratylenchus neglectus<\/a><\/em><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11740\"><i>Pratylenchus penetrans <\/i>(Cobb, 1917) Filipjev &amp; Schuurmans Stekhoven, 1941 Cobb\u2019s lesion nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10770\">Pratylenchus scribneri <\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10770\">Steiner, 1943 Scribner&#8217;s root-lesion nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: C\u00a0<\/strong><\/p>\n<p><em><a href=\"http:\/\/wp.me\/p5l8vQ-wL\">Pratylenchus thornei<\/a><\/em><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9600\"><em>Pratylenchus vulnus <\/em>Allen &amp; Jensen, 1951 walnut root lesion nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=12466\"><em>Pratylenchus zeae<\/em> Graham, 1951 Corn lesion nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6442\"><em>Punctodera punctata<\/em> (Thorne, 1928) Mulvey &amp; Stone, 1976<\/a><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C\u00a0\u00a0<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6404\"><em>Quinisulcius <\/em>spp. Siddiqi 1971<\/a><br \/>\n<span style=\"color: #ff0000;\"><strong><span style=\"color: #000000;\">Pest Rating: C\u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/strong><\/span><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2687\"><em>Radopholus similis<\/em> (Cobb, 1893) Thorne, 1949<\/a><br \/>\n<strong>Pest Rating:\u00a0A<\/strong><\/p>\n<p><em><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1434\">Rotylenchulus reniformis<\/a><\/em><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13485\"><em>Rotylenchulus parvus <\/em>(Williams) Sher 1961<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=11359\"><i>Rotylenchus robustus <\/i>(de Man, 1876) Filipjev, 1936 Spiral nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2607\"><em>Scutellonema<\/em> spp. Cobb, 1913<\/a><br \/>\n<strong>Pest Rating: C\u00a0 \u00a0<\/strong><\/p>\n<p><a href=\"http:\/\/wp.me\/p5l8vQ-wN\"><em>Tylenchorhynchus<\/em> spp.<\/a><br \/>\n<strong>Pest Rating: C\u00a0<\/strong><\/p>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10796\">Tylenchulus semipenetrans<\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10796\"> (Cobb, 1913) Citrus nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6906\"><em>Xiphinema americanum <\/em>Cobb, 1913 American dagger nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=12529\"><em>Xiphinema bakeri <\/em>Williams, 1961 Baker\u2019s dagger nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10780\">Xiphinema basiri <\/a><\/em><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=10780\">Siddiqi, 1959 dagger nematode<\/a><em><br \/>\n<\/em><strong>Pest Rating: A<\/strong><\/p>\n<p><span style=\"color: #ff0000;\">\u00a0<\/span><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13272\"><em>Xiphinema brasiliense <\/em>Lordello, 1951 Dagger nematode<\/a><br \/>\n<strong>\u00a0Pest Rating: A<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13509\"><span style=\"color: #ff0000;\">\u00a0<\/span><em>Xiphinema californicum <\/em>Lamberti &amp; Bleve-Zacheo, 1969<br \/>\nCalifornia dagger nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9631\"><em>Xiphinema chambersi <\/em>Thorne, 1939 Chambers\u2019 dagger nematode<\/a><br \/>\n<strong>Pest Rating: B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7894\"><em>Xiphinema diversicaudatum<\/em> (Micoletzky, 1927), Thorne, 1939\u00a0European dagger nematode<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<p><em><a href=\"http:\/\/wp.me\/p5l8vQ-ji\">Xiphinema index<\/a><br \/>\n<\/em><strong>Pest Rating: B<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13726\"><em>Xiphinema pachtaicum (<\/em>Tulaganov, 1938) Kirjanova, 1951 Dagger nematode<\/a><span style=\"color: #ff0000;\"><br \/>\n<span style=\"color: #000000;\"><strong>Pest Rating: C<\/strong><\/span>\u00a0 \u00a0<\/span><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13554\"><em>Xiphinema rivesi<\/em> Dalmasso 1969 Dagger nematode<\/a><br \/>\n<strong>Pest Rating: C<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9904\"><em>Xiphinema setariae\u00a0<\/em>Luc 1958 (syn.\u00a0<em>Xiphinema vulgare\u00a0<\/em>Tarjan, 1964) dagger nematode\u00a0<\/a><br \/>\n<strong>Pest Rating: A<\/strong><\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>(Plant Parasitic Nematodes) Nematodes (also called \u2018roundworms\u2019) are relatively small, multicellular, worm-like animals. They are found in almost every environmental niche imaginable, living free in soil, marine and freshwater habitats while feeding on bacteria, fungi, and nematodes, or as parasites of humans, insects, fish, larger animals and plants. Plant parasitic nematodes are abundant in many &hellip; <a href=\"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1955\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Nematodes<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1117,"featured_media":2007,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[333],"tags":[],"class_list":["post-1955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ratings"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/05\/nematodes-featured-image.jpg?fit=1038%2C588&ssl=1","jetpack_sharing_enabled":false,"jetpack_shortlink":"https:\/\/wp.me\/p5l8vQ-vx","jetpack-related-posts":[{"id":2029,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2029","url_meta":{"origin":1955,"position":0},"title":"Helicotylenchus spp.  Steiner, 1945","author":"Admin","date":"June 2, 2016","format":false,"excerpt":"California Pest Rating for Helicotylenchus spp.\u00a0 Steiner, 1945 \u00a0Pest Rating: C\u00a0 \u00a0 PEST RATING PROFILE Initiating Event: During the 1950-60s, several species of plant parasitic nematodes were given a \u2018D\u2019 rating as they were regarded as parasites, predators or organisms of little or no economic importance that did not require\u2026","rel":"","context":"In &quot;Nematodes&quot;","block_context":{"text":"Nematodes","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=27"},"img":{"alt_text":"helicotylenchus spp.","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/5440548-helicotylenchus_Jonathan-D-Eisenback_VirginiaPolytechnicInstitute-and-StateUniv_Bugwood.org_1.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/5440548-helicotylenchus_Jonathan-D-Eisenback_VirginiaPolytechnicInstitute-and-StateUniv_Bugwood.org_1.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/5440548-helicotylenchus_Jonathan-D-Eisenback_VirginiaPolytechnicInstitute-and-StateUniv_Bugwood.org_1.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/5440548-helicotylenchus_Jonathan-D-Eisenback_VirginiaPolytechnicInstitute-and-StateUniv_Bugwood.org_1.jpg?resize=700%2C400 2x"},"classes":[]},{"id":2033,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2033","url_meta":{"origin":1955,"position":1},"title":"Tylenchorhynchus spp.  Cobb, 1913","author":"Admin","date":"June 2, 2016","format":false,"excerpt":"California Pest Rating for Tylenchorhynchus spp.\u00a0 Cobb, 1913 Pest Rating: C\u00a0 \u00a0 PEST RATING PROFILE Initiating Event: During the 1950-60s, several species of plant parasitic nematodes were given a \u2018D\u2019 rating as they were regarded as parasites, predators or organisms of little or no economic importance that did not require\u2026","rel":"","context":"In &quot;Nematodes&quot;","block_context":{"text":"Nematodes","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=27"},"img":{"alt_text":"stunt nematode: symptoms, stunting of corn seedling","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/1524089-stunt-nematode_symptoms-stunting-of-corn-seedling-NorthCarolinaUniv-bugwood.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/1524089-stunt-nematode_symptoms-stunting-of-corn-seedling-NorthCarolinaUniv-bugwood.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/1524089-stunt-nematode_symptoms-stunting-of-corn-seedling-NorthCarolinaUniv-bugwood.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/06\/1524089-stunt-nematode_symptoms-stunting-of-corn-seedling-NorthCarolinaUniv-bugwood.jpg?resize=700%2C400 2x"},"classes":[]},{"id":2607,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=2607","url_meta":{"origin":1955,"position":2},"title":"Scutellonema spp.  Cobb, 1913","author":"Admin","date":"September 21, 2016","format":false,"excerpt":"California Pest Rating for Scutellonema spp.\u00a0 Cobb, 1913 Pest Rating: C\u00a0 \u00a0 PEST RATING PROFILE Initiating Event: During the 1950-60s, several species of plant parasitic nematodes were given a \u2018D\u2019 rating as they were regarded as parasites, predators or organisms of little or no economic importance that did not require\u2026","rel":"","context":"In &quot;Nematodes&quot;","block_context":{"text":"Nematodes","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=27"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3199,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=3199","url_meta":{"origin":1955,"position":3},"title":"Paratylenchus spp.  Micoletzky, 1922","author":"Admin","date":"January 11, 2017","format":false,"excerpt":"California Pest Rating for Paratylenchus spp.\u00a0 Micoletzky, 1922 Pest Rating: C\u00a0 \u00a0 PEST RATING PROFILE Initiating Event: During the 1950-60s, several species of plant parasitic nematodes were given a \u2018D\u2019 rating as they were regarded as parasites, predators or organisms of little or no economic importance that did not require\u2026","rel":"","context":"In &quot;Nematodes&quot;","block_context":{"text":"Nematodes","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=27"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5680,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=5680","url_meta":{"origin":1955,"position":4},"title":"Ditylenchus dipsaci (K\u00fchn, 1857) Filipjev, 1936","author":"Admin","date":"August 2, 2018","format":false,"excerpt":"California Pest Rating for Ditylenchus dipsaci (K\u00fchn, 1857) Filipjev, 1936 Pest Rating: C \u00a0 PEST RATING PROFILE Initiating Event:\u00a0 None. The current rating and status of Ditylenchus dipsaci in California are re-evaluated. History & Status: Background:\u00a0 During the 1920s, the stem and bulb nematode was one of the earliest nematodes\u2026","rel":"","context":"In &quot;C-Rated&quot;","block_context":{"text":"C-Rated","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=671"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1436,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1436","url_meta":{"origin":1955,"position":5},"title":"Pratylenchus neglectus","author":"Admin","date":"January 5, 2016","format":false,"excerpt":"California Pest Rating for Pratylenchus neglectus (Rensch, 1924) Filipjev & Schuurmans-Stekhoven, 1941 Pest Rating: C \u00a0 PEST RATING PROFILE Initiating Event: During the 1950-60s, several species of plant parasitic nematodes were given a \u2018D\u2019 rating as they were regarded as parasites, predators or organisms of little or no economic importance\u2026","rel":"","context":"In &quot;Nematodes&quot;","block_context":{"text":"Nematodes","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=27"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/posts\/1955","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/users\/1117"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1955"}],"version-history":[{"count":235,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/posts\/1955\/revisions"}],"predecessor-version":[{"id":14559,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/posts\/1955\/revisions\/14559"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/media\/2007"}],"wp:attachment":[{"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}