{"id":5314,"date":"2018-04-30T14:12:50","date_gmt":"2018-04-30T21:12:50","guid":{"rendered":"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=5314"},"modified":"2018-06-22T12:52:38","modified_gmt":"2018-06-22T19:52:38","slug":"weevil-dryophthorus-homoeorhynchus-perkins","status":"publish","type":"post","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=5314","title":{"rendered":"Weevil | Dryophthorus homoeorhynchus Perkins"},"content":{"rendered":"
California Pest Rating for\u00a0<\/strong><\/h5>\n
Dryophthorus homoeorhynchus <\/em><\/strong>Perkins: weevil<\/strong><\/h5>\n
Coleoptera: Dryopthoridae<\/strong><\/h5>\n
Pest Rating: C<\/strong><\/h5>\n

\u00a0<\/strong><\/p>\n

\n
PEST RATING PROFILE<\/h5>\n
Initiating Event: <\/strong><\/h5>\n

Dryophthorus homoeorhynchus <\/em>is currently Q-rated.\u00a0 A permanent pest rating proposal is required to support an official pest rating.<\/p>\n

History & Status: <\/strong><\/h5>\n

Background:<\/u><\/strong> \u00a0<\/em>This beetle is black in color, elongate, and 4.5-6 mm in length.\u00a0 The species has a short rostrum (\u201cbeak\u201d) (Perkins, 1900).\u00a0 Larvae of all species of Dryophthorus<\/em>, including D. homoeorhynchus<\/em>, apparently feed on rotting plant material, primarily wood.\u00a0 Dryophthorus homoeorhynchus<\/em> is reported to feed on decomposing Chrysodracon<\/em> species (Dracaenaceae) in Hawaii (Swezey, 1931; Swezey, 1954; Wagner et al., 2005).\u00a0 Other species in the genus are reported to feed on rotting hardwood and conifer wood, and at least one species has been reported to feed on rotting tree fern fronds (Hawaiian Entomological Society, 1928; O\u2019Brien, 1997).<\/p>\n

Worldwide Distribution<\/u><\/strong>:<\/u><\/strong>\u00a0 This beetle is native to, and is only known to occur in Hawaii.\u00a0 The species has been reported from Hawaii, Oahu, Maui, and Molokai islands (Natural Resources Conservation Service, 2009; Swezey, 1954).<\/p>\n

Official Control:<\/u><\/strong> This beetle is not known to be under official control anywhere.<\/p>\n

California Distribution: <\/u><\/strong>\u00a0This beetle is not known to be present in California (Symbiota Collections of Arthropods Network).<\/p>\n

California Interceptions:<\/u><\/strong>\u00a0 This beetle was intercepted on pineapple from Hawaii in February 2004 (California Department of Food and Agriculture).<\/p>\n

The risk Dryophthorus homoeorhynchus <\/em>wo<\/em>uld pose to California is evaluated below.<\/p>\n

Consequences of Introduction:<\/strong><\/h5>\n

1) Climate\/Host Interaction:<\/strong> Dryophthorus homoeorhynchus<\/em> is only known to occur in Hawaii. If this beetle requires the climate found in its current area of distribution, then only a small portion of California would offer a similar suitable climate.\u00a0 \u00a0At least one species in the family Dracaenaceae, Dracaena draco<\/em>, is grown as an outdoor plant in California and could possibly serve as a host plant for homoeorhynchus<\/em>.\u00a0 Due to the apparent climate restrictions, it appears unlikely that this beetle could become established in more than a small portion of California.\u00a0 Therefore, D. homoeorhynchus <\/em>receives a Low (1)<\/span> <\/strong>in this category.<\/p>\n

\u2013 Low (1) Not likely to establish in California; or likely to establish in very limited areas.<\/strong><\/span><\/p>\n

\u2013 Medium (2) may be able to establish in a larger but limited part of California.<\/p>\n

\u2013 High (3) likely to establish a widespread distribution in California.<\/p>\n

2) Known Pest Host Range: <\/strong>Dryophthorus homoeorhynchus<\/em> is only known to feed on the genus Chrysodracon<\/em>. Therefore, it receives a Low (1)<\/span><\/strong> in this category.<\/p>\n

\u2013 Low (1) has a very limited host range.<\/strong><\/span><\/p>\n

\u2013 Medium (2) has a moderate host range.<\/p>\n

\u2013 High (3) has a wide host range.<\/p>\n

3) Pest Dispersal Potential:<\/strong> The biology of homoeorhynchus<\/em> is poorly known.\u00a0 The beetle is assumed to fly. \u00a0Therefore, it receives a Medium (2)<\/span><\/strong> in this category.<\/p>\n

\u2013 Low (1) does not have high reproductive or dispersal potential.<\/p>\n

\u2013 Medium (2) has either high reproductive or dispersal potential.<\/strong><\/span><\/p>\n

\u2013 High (3) has both high reproduction and dispersal potential.<\/p>\n

4) Economic Impact:<\/strong> This beetle is only known to feed on dead plant material, as are all other members of the genus.\u00a0 Negative economic impacts are unlikely if this beetle became established in California.\u00a0 The species apparently feeds on decomposing plant material, not freshly-cut wood, and is known to be restricted to plants in the family Dracaenaceae, therefore there is little risk to timber. Therefore, it receives a Low (1)<\/span><\/strong> in this category.<\/p>\n

Economic Impact:<\/p>\n

A. The pest could lower crop yield.<\/p>\n

B. The pest could lower crop value (includes increasing crop production costs).<\/p>\n

C. The pest could trigger the loss of markets (includes quarantines).<\/p>\n

D. The pest could negatively change normal cultural practices.<\/p>\n

E. The pest can vector, or is vectored, by another pestiferous organism.<\/p>\n

F. The organism is injurious or poisonous to agriculturally important animals.<\/p>\n

G. The organism can interfere with the delivery or supply of water for agricultural uses.<\/p>\n

Economic Impact Score: 1<\/span><\/strong><\/p>\n

\u2013 Low (1) causes 0 or 1 of these impacts.<\/strong><\/span><\/p>\n

\u2013 Medium (2) causes 2 of these impacts.<\/p>\n

\u2013 High (3) causes 3 or more of these impacts.<\/p>\n

5) Environmental Impact:<\/strong> Negative environmental impacts of this species if it became established in California appear minimal. The species feeds on dead plant material, and it appears to be restricted to a family of plants, the Dracaenaceae, that do not include any native California species.\u00a0 Therefore, it receives a Low (1)<\/span><\/strong> in this category.<\/p>\n

Evaluate the environmental impact of the pest on California using the criteria below.<\/p>\n

Environmental Impact:<\/p>\n

A. The pest could have a significant environmental impact such as lowering biodiversity, disrupting natural communities, or changing ecosystem processes.<\/p>\n

B. The pest could directly affect threatened or endangered species.<\/p>\n

C. The pest could impact threatened or endangered species by disrupting critical habitats.<\/p>\n

D. The pest could trigger additional official or private treatment programs.<\/p>\n

E. The pest significantly impacts cultural practices, home\/urban gardening or ornamental plantings.<\/p>\n

Environmental Impact Score: 1<\/p>\n

\u2013 Low (1) causes none of the above to occur.<\/strong><\/span><\/p>\n

\u2013 Medium (2) causes one of the above to occur.<\/p>\n

\u2013 High (3) causes two or more of the above to occur.<\/p>\n

Consequences of Introduction to California for Dryophthorus homoeorhynchus<\/em>: Low (6)<\/span><\/strong><\/h5>\n

Add up the total score and include it here.<\/p>\n

\u2013Low = 5-8 points<\/strong><\/p>\n

\u2013Medium = 9-12 points<\/p>\n

\u2013High = 13-15 points<\/p>\n

6) Post Entry Distribution and Survey Information:<\/strong> Dryophthorus homoeorhynchus<\/em> is not known to occur in California. \u00a0It receives a Not established (0)<\/span> <\/strong>in this category.<\/p>\n

\u2013Not established (0) Pest never detected in California, or known only from incursions.<\/strong><\/span><\/p>\n

\u2013Low (-1) Pest has a localized distribution in California, or is established in one suitable climate\/host area (region).<\/p>\n

\u2013Medium (-2) Pest is widespread in California but not fully established in the endangered area, or pest established in two contiguous suitable climate\/host areas.<\/p>\n

\u2013High (-3) Pest has fully established in the endangered area, or pest is reported in more than two contiguous or non-contiguous suitable climate\/host areas.<\/p>\n

Final Score:<\/strong><\/h5>\n

7) The final score is<\/strong> the consequences of introduction score minus the post entry distribution and survey information score: Low (6)<\/span><\/strong><\/p>\n

Uncertainty:<\/strong><\/h5>\n

Dryophthorus <\/em>homoeorhynchus<\/em> may be able to tolerate cooler temperatures than are present in its native distribution.\u00a0 If this is the case, the species could become established over a greater portion of California if suitable plant material is present.\u00a0 The beetle may also be able to feed on plants in families other than Dracaenaceae.\u00a0 Feeding on living plant tissue, however, has not been reported in Hawaii and apparently all species in the genus Dryophthorus<\/em> feed on dead, rotting plant tissue.<\/p>\n

Conclusion and Rating Justification:<\/strong><\/h5>\n

Dryophthorus homoeorhynchus<\/em> is a tropical\/subtropical beetle that feeds on dead plants in the family Dracaenaceae, and it is a member of a genus that is apparently restricted to dead, rotting plant material.\u00a0 This beetle appears to pose no threat, economic or environmental, to California.\u00a0 For these reasons, a \u201cC<\/strong>\u201d rating is justified.<\/p>\n

\n
References: <\/strong><\/h5>\n

California Department of Food and Agriculture.\u00a0 Pest and damage record database.\u00a0 Accessed March 22, 2018. https:\/\/pdr.cdfa.ca.gov\/PDR\/pdrmainmenu.aspx<\/a><\/p>\n

Hawaiian Entomological Society.\u00a0 1928.\u00a0 January 6, 1927; notes and exhibitions.\u00a0 Proceedings of the Hawaiian Entomological Society.\u00a0 7: 1-31.<\/p>\n

Natural Resources Conservation Service.\u00a0 2009.\u00a0 At-risk species and habitats lists.\u00a0 Biology Technical Note.\u00a0 22: 1-403.<\/p>\n

O\u2019Brien, C.W.\u00a0 1997.\u00a0 A catalog of the Coleoptera of America north of Mexico.\u00a0 Family: Curculionidae.\u00a0 Subfamilies: Acicnemidinae, Cossoninae, Rhytirrhininae, Molytinae, Petalochilinae, Trypetidinae, Dryophthorinae, Tachygoninae, Thecesterninae.\u00a0 United States Department of Agriculture.\u00a0 48 pp.<\/p>\n

Perkins, R.C.L.\u00a0 1900.\u00a0 II.\u00a0 Coleoptera Rhyncophora, Proterhinidae, Heteromera and Cioidae.\u00a0 117-270 in\u00a0\u00a0 (D. Sharp, ed.) Fauna Hawaiiensis.\u00a0 Cambridge University Press.\u00a0 London.\u00a0 579 pp.<\/p>\n

Swezey, O.H.\u00a0 1931.\u00a0 Some new records of insects on Molokai.\u00a0 Proceedings of the Hawaiian Entomological Society.\u00a0 7: 485-488.<\/p>\n

Swezey, O.H.\u00a0 1954.\u00a0 Forest entomology in Hawaii. \u00a0Bernice P. Bishop Museum Special Publication.\u00a0 44: 1-265.<\/p>\n

Symbiota Collections of Arthropods Network.\u00a0 Accessed March 20, 2018.\u00a0http:\/\/scan1.acis.ufl.edu<\/a><\/p>\n

Wagner, W.L., Herbst, D.R., and Lorence, D.H.\u00a0 2005.\u00a0 Flora of the Hawaiian Islands.\u00a0 Accessed March 20, 2018. http:\/\/botany.si.edu\/pacificislandbiodiversity\/hawaiianflora\/index.htm<\/a><\/p>\n

\n
Author:<\/h5>\n

Kyle Beucke, 1220 N Street, Room 221, Sacramento, CA, 95814, 916-403-6741; plant.health[@]cdfa.ca.gov.<\/p>\n

Responsible Party:<\/strong><\/h5>\n

Jason Leathers, 2800 Gateway Oaks, Sacramento CA 95833, (916) 654-1211, plant.health[@]cdfa.ca.gov<\/p>\n

\n
Comment Period:* CLOSED<\/span><\/h5>\n

4\/30\/18 \u2013 6\/14\/18<\/p>\n

\n
*NOTE:<\/span><\/h5>\n

You must be registered and logged in to post a comment. \u00a0If you have registered and have not received the registration confirmation, please contact us at\u00a0plant.health[@]cdfa.ca.gov.<\/p>\n

\n
Comment Format:<\/h5>\n

\u2666 \u00a0Comments should refer to the appropriate California Pest Rating Proposal Form subsection(s)\u00a0being commented on, as shown below.<\/p>\n

Example Comment:
\n<\/strong>Consequences of Introduction: \u00a01. Climate\/Host Interaction:\u00a0[Your comment that relates to \u201cClimate\/Host Interaction\u201d here.<\/em>]<\/p>\n

\u2666 \u00a0Posted comments will not be able to be viewed immediately.<\/p>\n

\u2666 \u00a0Comments may not be posted if they:<\/p>\n

Contain inappropriate language which is not germane to\u00a0the pest rating proposal;<\/p>\n

Contains defamatory, false, inaccurate, abusive, obscene, pornographic,\u00a0sexually oriented, threatening, racially offensive, discriminatory or illegal\u00a0material;<\/p>\n

Violates agency regulations prohibiting sexual harassment or other forms\u00a0of discrimination;<\/p>\n

Violates agency regulations prohibiting workplace violence, including threats.<\/p>\n

\u2666 \u00a0Comments may be edited prior to posting to ensure they are entirely germane.<\/p>\n

\u2666 \u00a0Posted comments shall be those which have been approved in content and posted to the\u00a0website to be viewed, not just submitted.<\/p>\n

\n

Pest Rating: C<\/strong><\/h3>\n

 <\/p>\n

\n

Posted by ls\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

California Pest Rating for\u00a0 Dryophthorus homoeorhynchus Perkins: weevil Coleoptera: Dryopthoridae Pest Rating: C \u00a0 PEST RATING PROFILE Initiating Event: Dryophthorus homoeorhynchus is currently Q-rated.\u00a0 A permanent pest rating proposal is required to support an official pest rating. History & Status: Background: \u00a0This beetle is black in color, elongate, and 4.5-6 mm in length.\u00a0 The species … Continue reading Weevil | Dryophthorus homoeorhynchus Perkins<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":325,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"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":[671,15,5],"tags":[],"class_list":["post-5314","post","type-post","status-publish","format-standard","hentry","category-c-rated","category-coleoptera","category-entomology"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5l8vQ-1nI","jetpack-related-posts":[{"id":1954,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1954","url_meta":{"origin":5314,"position":0},"title":"Insects, Mites & Earthworms","author":"Admin","date":"May 13, 2016","format":false,"excerpt":"Insects and mites are related in that their skeletons are on the outside (Phyllum: Arthropoda), but differ in that adult insects have six legs and adult mites have eight.\u00a0 Both groups can be beneficial, neutral or destructive to their environment.\u00a0 Like nematodes, they can cause yearly losses in the billions\u2026","rel":"","context":"In "Ratings"","block_context":{"text":"Ratings","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=333"},"img":{"alt_text":"Insects and Mites Banner","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/05\/insects-and-mites-featured-image.jpg?fit=1038%2C588&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/05\/insects-and-mites-featured-image.jpg?fit=1038%2C588&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/05\/insects-and-mites-featured-image.jpg?fit=1038%2C588&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2016\/05\/insects-and-mites-featured-image.jpg?fit=1038%2C588&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":6582,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=6582","url_meta":{"origin":5314,"position":1},"title":"Ceratapion basicorne (Illiger): a weevil coleoptera: apionidae","author":"Kyle Beucke","date":"November 12, 2019","format":false,"excerpt":"California Pest Rating Profile for Ceratapion basicorne (Illiger): a weevil Pest Rating: D download pest rating profile *NOTE: You must be registered and logged in to post a comment. If you have registered and have not received the registration confirmation, please contact us at permits[@]cdfa.ca.gov. Posted by ka","rel":"","context":"In "Coleoptera"","block_context":{"text":"Coleoptera","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5636,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=5636","url_meta":{"origin":5314,"position":2},"title":"Twobanded Japanese Weevil | Pseudocneorhinus bifasciatus","author":"Karen Olmstead","date":"July 25, 2018","format":false,"excerpt":"Figure 1: Pseudcneorhinus bifasciatus (Photo: Judy Gallagher) California Pest Rating for Name: Pseudocneorhinus bifasciatus Roelofs (twobanded Japanese weevil) Synonym: Callirhopalus bifasciatus (Roelofs) Order: Coleoptera Family: Curculionidae Pest Rating: A PEST RATING PROFILE Initiating Event: Pseudocneorhinus bifasciatus is currently Q-rated.\u00a0 A permanent pest rating proposal is required to support an official\u2026","rel":"","context":"In "A-Rated"","block_context":{"text":"A-Rated","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=669"},"img":{"alt_text":"Twobanded Japanese Weevil","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/Section3162\/wp-content\/uploads\/2018\/07\/twobanded-Japanese-weevil-PRP-195x300.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3824,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=3824","url_meta":{"origin":5314,"position":3},"title":"Sri Lankan Weevil | Myllocerus undecimpustulatus undatus","author":"Javaid Iqbal","date":"July 7, 2017","format":false,"excerpt":"California Pest Rating for Myllocerus undecimpustulatus undatus: Sri Lankan weevil Coleoptera: Curculionidae Pest Rating: A \u00a0 PEST RATING PROFILE Initiating Event: Myllocerus undecimpustulatus undatus has been rated A by CDFA. Due to recent interceptions in California, a pest rating proposal is required. History & Status: Background: Myllocerus undecimpustulatus undatus\u00a0Marshall, the\u2026","rel":"","context":"In "Coleoptera"","block_context":{"text":"Coleoptera","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":8919,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=8919","url_meta":{"origin":5314,"position":4},"title":"Anthonomus rubi (Herbst): strawberry blossom weevil","author":"Kyle Beucke","date":"September 15, 2021","format":false,"excerpt":"California Pest Rating Profile for Anthonomus rubi (Herbst): strawberry blossom weevilPest Rating: A download pest rating profile *NOTE You must be registered and logged in to post a comment. If you have registered and have not received the registration confirmation, please contact us at permits[@]cdfa.ca.gov. Posted by tn","rel":"","context":"In "A-Rated"","block_context":{"text":"A-Rated","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=669"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":14069,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=14069","url_meta":{"origin":5314,"position":5},"title":"Anthonomus testaceosquamosus Linell: Hibiscus bud weevil","author":"Kyle Beucke","date":"August 22, 2025","format":false,"excerpt":"California Pest Rating Profile for Anthonomus testaceosquamosus Linell: Hibiscus bud weevil Pest Rating: A Comment Period:\u00a008\/22\/2025 \u2013 10\/06\/2025 Download Pest Rating Profile *NOTE You must be registered and logged in to post a comment. If you have registered and have not received the registration confirmation, please contact us at permits[@]cdfa.ca.gov.\u2026","rel":"","context":"In "A-Rated"","block_context":{"text":"A-Rated","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=669"},"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\/5314","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\/325"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5314"}],"version-history":[{"count":7,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/posts\/5314\/revisions"}],"predecessor-version":[{"id":5519,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=\/wp\/v2\/posts\/5314\/revisions\/5519"}],"wp:attachment":[{"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5314"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5314"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5314"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}