{"id":1119,"date":"2015-09-28T16:07:26","date_gmt":"2015-09-28T23:07:26","guid":{"rendered":"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1119"},"modified":"2024-04-26T11:20:35","modified_gmt":"2024-04-26T18:20:35","slug":"myrtle-rust-puccinia-psidii-g-winter","status":"publish","type":"post","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1119","title":{"rendered":"Myrtle Rust: Puccinia psidii G. Winter"},"content":{"rendered":"
California Pest Rating for<\/strong><\/h5>\n
Puccinia psidii <\/em><\/strong>G. Winter<\/strong><\/h5>\n
(Myrtle Rust)<\/strong><\/h5>\n
Pest Rating: C<\/strong><\/h5>\n
\n
PEST RATING PROFILE<\/strong><\/h5>\n
Initiating Event: <\/strong><\/h5>\n

A review of the current pest rating of Myrtle Rust has been requested by certain counties due to the increased detection of the pathogen within California.\u00a0 Currently, Puccinia psidii<\/em> has a B rating.<\/p>\n

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

Background<\/span><\/strong>:\u00a0 In 1884, Winter first described the fungal rust pathogen, Puccinia psidii<\/em> from infected guava (Psidium guajava<\/em>), of the plant family Myrtaceae, in Brazil.\u00a0 Since then, several rust species described from infected members of Myrtaceae and named after the host they were detected on, are now considered synonyms of P. psidii<\/em>. This pathogen is also commonly known as guava rust, eucalyptus rust (in Florida, the Caribbean, and Central and South America), and ohi\u2019a rust (in Hawaii) after its respective host.\u00a0 In 2010, P. psidii<\/em> was detected in Australia (as Uredo rangelii<\/em>) on common myrtle and subsequently known as myrtle rust \u2013 a name which best fits P. psidii<\/em> as it \u201ccaptures the occurrence of the pathogen on a very wide host range including numerous genera and species of Myrtales\u201d (Roux et al<\/em>., 2013).<\/p>\n

There are several biological biotypes or races of Puccinia psidii <\/em>known to exhibit varying virulence on different hosts, environmental tolerances, sporulation characteristics, and spore survival (Glen et al.,<\/em> 2007).<\/p>\n

Puccinia psidii<\/em> is native to South and Central America, but since its original report, it has spread to several countries worldwide, including California, Florida and Hawaii in the USA.\u00a0 As a result of its spread, the pathogen is considered an important quarantine threat to many countries (Glen et al<\/em>., 2007). Puccinia psidii<\/em> was first reported in the USA in Florida in 1977, then in Hawaii in 2005 and in California in 2006.\u00a0 It is likely that the pathogen was present in California prior to 2006 and introduced from Florida through imported, diseased plants (Killgore & Heu, 2007; Marlatt & Kimbrough, 1979; Mellano, 2006).\u00a0 In 2011, the rust pathogen was first reported on Melaleuca quinquenervia <\/em>(paperbark) in a nursery in San Diego, California (Zambino & Nolan, 2011) but has now spread to outside environments and landscape (personal communications: Pat Nolan, plant pathologist, Department of Agriculture, Weights and Measures, County of San Diego, CA.)<\/em> Although the pathogen currently has a B rating that allows implementation of eradicative action in nurseries, this may not have always been implemented, thereby, providing a pathway of introduction and spread to outside environments.\u00a0 Furthermore, this rust \u2013 as well as many other rust pathogens \u2013 is very difficult to eradicate due to its ease of long distance dispersal and wide host range.\u00a0 Once established in a region it can and has spread rapidly to amenity plantings, commercial and native environments (CABI, 2015).<\/p>\n

Disease cycle<\/strong><\/span>: <\/u>\u00a0Puccinia psidii<\/em> is considered to complete its life cycle on the same host (autoecious), having an incomplete lifecycle. The suggestion that the pathogen is heteroecious with an unknown aecial host is considered doubtful (Glen et al., 2007).\u00a0\u00a0\u00a0\u00a0 With the exception of spermagonia, all other spore states are produced on the same host.\u00a0 Urediniospores are produced abundantly under natural conditions, but the production of teliospores and basidiospores are comparatively rare and spermagonia and aeciospores are unknown. \u00a0\u00a0\u00a0Under favorable conditions of humidity and temperature, urediniospores present on host germinate to penetrate the tissue through stomata.\u00a0 As the fungus grows, uredinia (fruiting structures) are formed and urediniospores are produced in abundance.\u00a0\u00a0 Disease development is favored by low temperatures of about 20\u00b0C, high relative humidity (80%) at night and high levels of airborne urediniospores.\u00a0 On rose apple (Syzygium jambos<\/em>) in Brazil, rust epidemics incidence and severity were dependent on the duration of leaf wetness over 90% or leaf wetness periods greater than 6 hours and nocturnal temperature between 18 and 22\u00b0C (Blum and Dianese, 2001; CABI, 2015; Tessman et al.,<\/em> 2001).<\/p>\n

Dispersal and spread<\/em>: Rust spores are wind-dispersed over long distances. \u00a0Long and short distance spread is through rust-contaminated planting material, nursery stock, cuttings, flowers, timber, wood packaging, equipment, tools, and human clothing\/contact.\u00a0 Foraging honey bees, bats, and birds in contact with rust spores have vectored the pathogen to uninfected host plants (Carnegie et al.,<\/em> 2010).\u00a0 Under sub-optimal conditions, the pathogen can remain in non-symptomatic plants for 4-6 weeks before symptoms are visible, thereby enabling undetected spread to non-infected regions (Carnegie & Lidbetter, 2012)<\/p>\n

Hosts:<\/em>\u00a0 Several genera and species belonging to the order Myrtales, in the family Myrtaceae. The natural and experimental global host list for Puccinia psidii<\/em> includes 445 species in 73 genera and 16 tribes of the family Myrtaceae.\u00a0 However, a large proportion of these hosts are known only as experimental hosts (CABI, 2015).\u00a0 Primary hosts include genera and species of: Agonis flexuosa <\/em>(willow myrtle), Eucalyptus <\/em>spp., E. dunnii, E. globulus, E. gracilis, Eugenia <\/em>spp., Eugenia uniflora <\/em>(Surinam cherry), Melaleuca spp., Melaleuca quinquenervia <\/em>(paperbark), Metrosideros polymorpha <\/em>(ohi\u2019a), Myrtus communis <\/em>(myrtle), Pimenta <\/em>spp., Pimenta dioica <\/em>(allspice), Psidium <\/em>spp., Psidium guajava <\/em>(guava), Syzygium jambos <\/em>(Malabar plum), S. samarangense <\/em>(wax apple), Rhodonyrtus tomentosa<\/em> (rose myrtle) (CABI, 2015; EPPO, 2015).\u00a0 Other hosts are also included in the genera of Myrtaceae: Actinostemon<\/em>, Asclepias<\/em>, Callistemon<\/em>, Calycorectes<\/em>, Campomanesia<\/em>, Jambosa<\/em>, Marlierea<\/em>, Metrosideros, Myrcia<\/em><\/em>, Myrciaria<\/em>, Myrceugenia,<\/em> Pseudomyrcianthes<\/em>, Psidiopsis<\/em>, and Syzygium (Farr & Rossman, 2015).<\/em><\/p>\n

Symptoms and damage potential<\/em>:\u00a0 Symptoms vary depending on the host species, level of susceptibility within a host species and age of host leaf. \u00a0Actively growing, young leaves, stems, and shoot tips, also fruit, sepals, and flowers are susceptible to P. psidii <\/em>infection.\u00a0 Initial symptoms of rust infections appear two to four days after infection as tiny chlorotic specks that develop into 0.1-0.5 mm-diameter spots or pustules (uredinia).\u00a0 Uredinia occur in groups on leaves (commonly on the underside, but not always), on stems, flowers and fruit.\u00a0 After a few days, these pustules erupt due to the production of bright yellow to orange-yellow urediniospores.\u00a0 The infected area or spots expand and multiple pustules merge over time.\u00a0 Older lesions have purple margins on leaves and shoots of many Eucalyptus<\/em>, Melaleuca<\/em> and Callistemon<\/em> hosts.\u00a0 Infected plant tissue becomes necrotic. If left untreated, disease-affected plants result in deformed leaves, heavy defoliation of branches, stunted growth, dieback, and eventually, death (CABI, 2015; Glen et al<\/em>., 2007).<\/p>\n

Puccinia psidii<\/em> can cause significant losses to economically important young tree crops, such as, Eucalyptus<\/em> spp., and other environmental trees in Myrtaceae \u2013 including myrtle and paperbark.\u00a0 Severe disease infections on foliage, inflorescences, and young succulent fruits can seriously impact guava production causing defoliation, death of shoot tips, and mummified fruit (Glen, et al<\/em>., 2007; Hernandez, 2006).\u00a0 80-100% loss of guava production was been reported in Brazil (CABI, 2015).<\/p>\n

Worldwide Distribution<\/u><\/strong>: Asia<\/em>: China, Japan; Africa<\/em>: South Africa; North America:<\/em> Mexico, USA; Central America and Caribbean:<\/em> Costa Rica, Cuba, Dominica, Dominican Republic, Guatemala, Jamaica, Panama, Puerto Rico, Trinidad and Tobago, United States Virgin Islands and British Virgin Islands; South America:<\/em> Argentina, Brazil, Colombia, Ecuador, Paraguay, Uruguay, Venezuela; Oceania:<\/em> Australia, New Caledonia.\u00a0\u00a0 Records of the absence of Puccinia psidii<\/em> from India and Taiwan are considered unreliable (CABI, 2015; EPPO, 2015).<\/p>\n

In the USA, Puccinia psidii<\/em> is considered an invasive species that has been reported from Florida, Hawaii, and California (CABI, 2015).<\/p>\n

Official Control<\/u><\/strong>: Puccinia psidii<\/em> has recently been made federally actionable for imports destined for Hawaii, however, domestic shipments are not affected (CABI, 2015).\u00a0 Puccinia psidii<\/em> is on the Harmful Organism List for the following countries: Mexico, Morocco, Nambia, New Zealand, South Africa, and Vietnam (USDA-PCIT, 2015).\u00a0 In 2007, it was declared a Quarantine pest in Jordan (EPPO, 2015).\u00a0 Currently, P. psidii<\/em> is a B-rated pathogen in California.<\/p>\n

California Distribution<\/u><\/strong>:\u00a0 Puccinia psidii <\/em>has been detected in nursery stock in Contra Costa, Orange, San Diego, San Francisco, Santa Barbara, Santa Clara, and Santa Cruz Counties.<\/p>\n

California Interceptions<\/u><\/strong>: Puccinia psidii<\/em> has been detected in several interceptions of infected nursery stock shipped from Hawaii and Florida.<\/p>\n

The risk Myrtle Rust would pose to California is evaluated below.<\/p>\n

Consequences of Introduction:\u00a0 <\/strong><\/h5>\n

1) Climate\/Host Interaction<\/strong>: Evaluate if the pest would have suitable hosts and climate to establish in California. Score:<\/p>\n

– Low (1) not likely to establish in California; or likely to establish in very limited areas
\n\u2013 Medium (2)<\/strong> may be able to establish in a larger but limited part of California<\/span>
\n\u2013 High (3) <\/span>likely to establish a widespread distribution in California.<\/p>\n

Risk is Medium (2)<\/span>:\u00a0 <\/em><\/strong>The Myrtle rust pathogen is already established in California and is suspected to be present wherever Myrtaceae host plants are grown in nurseries and natural environments.\u00a0 These environments include mainly coastal counties.<\/em><\/p>\n

2) Known Pest Host Range<\/strong>: Evaluate the host range of the pest. Score:<\/p>\n

– Low (1) has a very limited host range
\n\u2013\u00a0Medium (2) has a moderate host range
\n\u2013 High (3)<\/strong> has a wide host range.<\/span><\/p>\n

Risk is High (3)<\/span>:\u00a0 <\/em><\/strong>Puccinia psidii has a wide host range of over 400 species within the plant family Myrtaceae. \u00a0However, a large proportion of these hosts are experimental ones.\u00a0 Main hosts included in several genera listed under \u201chosts\u201d in the above text.\u00a0 While several strains of the pathogen are known to exist, exhibiting different virulence and host specificities, at least one strain attacking <\/em>Melaleuca quinquenervia (paperbark) is known to occur in outdoor environments in California.\u00a0 Planted Melaleuca is common in coastal southern California.\u00a0 Other Myrtaceae hosts present in the State, such as Eucalyptus, may also be at risk although the rust pathogen has not been reported on Eucalyptus in California.<\/em><\/p>\n

3) Pest Dispersal Potential<\/strong>: Evaluate the natural and artificial dispersal potential of the pest. Score:<\/p>\n

– Low (1) does not have high reproductive or dispersal potential
\n\u2013 Medium (2) has either high reproductive or dispersal potential
\n\u2013 High (3) <\/strong>has both high reproduction and dispersal potential.<\/span><\/p>\n

Risk is High (3)<\/span>: <\/em><\/strong>Puccinia psidii has high reproduction and dispersal potential via its windblown spores that are capable of being transmitted by strong winds over distances of several hundred kilometers.\u00a0 Also they may be spread over long distances via infected nursery stock, cuttings, flowers, timber, wood packaging, equipment, tools, and human clothing\/contact.\u00a0 Other agents of spread include foraging honey bees, bats, and birds in contact with rust spores.\u00a0 Under sub-optimal conditions, the pathogen can remain in non-symptomatic plants for 4-6 weeks before symptoms are visible, thereby enabling undetected spread to non-infected regions.\u00a0 The pathogen has already spread from nursery sites to outdoor natural environments within California.<\/em><\/p>\n

4) Economic Impact<\/strong>: Evaluate the economic impact of the pest to California using the criteria below. Score:<\/p>\n

A. \u00a0 The pest could lower crop yield.
\nB. \u00a0 The pest could lower crop value (includes increasing crop production costs).
\nC. \u00a0 The pest could trigger the loss of markets (includes quarantines).
\nD. \u00a0 The pest could negatively change normal cultural practices.
\nE. \u00a0 The pest can vector, or is vectored, by another pestiferous organism.
\nF. \u00a0 The organism is injurious or poisonous to agriculturally important animals.
\nG. \u00a0 The organism can interfere with the delivery or supply of water for agricultural uses.<\/p>\n

– Low (1) causes 0 or 1 of these impacts
\n\u2013 Medium (2) causes 2 of these impacts
\n\u2013 High (3)<\/strong> causes 3 or more of these impacts.<\/span><\/p>\n

Risk is High (3)<\/span>: <\/em><\/strong>The presence of <\/em>Puccinia psidii in California is already a quarantine issue for exports of Myrtaceae hosts destined for Hawaii, as well as an actionable concern to some other non Myrtle rust-infected countries. Furthermore, rust infections could result in lowered crop value, yield and altered cultural practices in nursery grown plants.\u00a0 The fungus can be vectored to non-infected hosts by insects and larger animals contaminated with spores. <\/em><\/p>\n

5) Environmental Impact<\/strong>: Evaluate the environmental impact of the pest on California using the criteria below.<\/p>\n

A. \u00a0 The pest could have a significant environmental impact such as lowering biodiversity, disrupting natural communities, or changing ecosystem processes.
\nB. \u00a0 The pest could directly affect threatened or endangered species.
\nC. \u00a0 The pest could impact threatened or endangered species by disrupting critical habitats.
\nD. \u00a0 The pest could trigger additional official or private treatment programs.
\nE. \u00a0 The pest significantly impacts cultural practices, home\/urban gardening or ornamental plantings.<\/p>\n

Score the pest for Environmental Impact:<\/p>\n

– Low (1) causes none of the above to occur
\n\u2013 Medium (2)<\/strong> causes one of the above to occur<\/span>
\n\u2013 High (3) causes two or more of the above to occur.<\/p>\n

Risk is <\/em><\/strong><\/span>Medium (2)<\/span>:<\/em><\/strong>\u00a0 <\/em><\/strong>Puccinia psidii infections could affect growth of hosts within Myrtaceae. There are several species within Myrtaceae which are listed as endangered and may potentially by threatened by the fungus.\u00a0 However, reports of Myrtle rust affecting these other host plants established in outdoor environments in California is currently not known.\u00a0 <\/em><\/p>\n

Consequences of Introduction to California for Myrtle\u00a0Rust:<\/strong><\/h5>\n

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

Low = 5-8 points
\nMedium = 9-12 points
\nHigh<\/strong> = 13-15 points<\/span><\/p>\n

Total points obtained on evaluation of consequences of introduction to California = 13 (High)<\/span>.<\/strong><\/p>\n

6) Post Entry Distribution and Survey Information<\/strong>: Evaluate the known distribution in California. Only official records identified by a taxonomic expert and supported by voucher specimens deposited in natural history collections should be considered. Pest incursions that have been eradicated, are under eradication, or have been delimited with no further detections should not be included. (Score)<\/p>\n

-Not established (0) Pest never detected in California, or known only from incursions.
\n-Low (-1) Pest has a localized distribution in California, or is established in one suitable climate\/host area (region).
\n-Medium (-2) Pest is widespread in California but not fully established in the endangered area, or pest established in two contiguous suitable climate\/host areas.
\n–High (-3)<\/span><\/strong> 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

Evaluation is High (-3)<\/span>.\u00a0 <\/em><\/strong>Puccinia psidii has been detected in nursery stock in Contra Costa, Orange, San Diego, San Francisco, Santa Barbara, Santa Clara, and Santa Cruz Counties.\u00a0 It has also been detected in outdoor environments in San Diego County as well as suspected to have spread to outdoor environments of the above listed counties. \u00a0\u00a0<\/em><\/p>\n

Final Score:<\/h5>\n

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

Final Score: <\/em><\/strong><\/span>\u00a0Score of Consequences of Introduction \u2013 Score of Post Entry Distribution and Survey Information = 10 (Medium)<\/span>.<\/strong><\/em><\/p>\n

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

Puccinia psidii<\/em> is a quickly spreading rust pathogen that is very difficult to eradicate manly due to its ease of long distance dispersal and broad host range.\u00a0 It is already established in outdoor environments within the State.\u00a0 More information on its parasitism of different plant species in California will increase current knowledge of host range and further strengthen its proposed rating.<\/p>\n

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

Based on the evidence provided above the proposed rating for Puccinia psidii<\/em> is C.<\/strong><\/p>\n

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

B<\/strong>lum L. E. B., and J. C. Dianese .\u00a0 2001.\u00a0 Patterns of urediniospores release and development of rose apple rust. Pesquisa Agropecuaria Brasileira <\/em>36<\/strong>: 845\u2013850.<\/p>\n

C<\/strong>arnegie, A. J. and J. R. Lidbetter.\u00a0 2012.\u00a0 Rapidly expanding host range for Puccinia psidii<\/em> sensu lato in Australia. Australasian Plant Pathology, 41(1):13-29. http:\/\/www.springerlink.com\/content\/w8538 mu25rh72870\/fulltext.html<\/a>.<\/p>\n

C<\/strong>arnegie, A. J., J. R. Lidbetter, J. Walker, M. A. Horwood, L. Tesoriero, M. Glen, and M. J. Priest.\u00a0 2010.\u00a0 Uredo rangelii,<\/em> a taxon in the guava rust complex, newly recorded on Myrtaceae in Australia. Australasian Plant Pathology, 39(5):463-466. http:\/\/www.publish.csiro.au\/nid\/39.htm<\/a>.<\/strong><\/p>\n

E<\/strong>PPO.\u00a0 \u00a02015.\u00a0 Puccinia psidii<\/em> (PUCCPS).\u00a0 PQR database.\u00a0 Paris, France: European and Mediterranean Plant Protection Organization. \u00a0http:\/\/www.newpqr.eppo.int<\/a><\/p>\n

F<\/strong>arr, D. F. and A. Y. Rossman, Fungal databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA.\u00a0 Retrieved August 24, 2015 from http:\/\/nt.ars-grin.gov\/fungaldatabases\/<\/a>.<\/p>\n

G<\/strong>len, M., A. C. Alfenas, E. A. V. Zauza, M. J. Wingfield and C. Mohammed.\u00a0 <\/strong>2007.\u00a0 Puccinia psidii<\/em>: a threat to the Australian environment and economy \u2013 a review.\u00a0 Australasian Plant Pathology, 36: 1-16.<\/p>\n

H<\/strong>ernandez, J. R.\u00a0\u00a0 2015.\u00a0 Invasive fungi, Puccinia psidii<\/em>.\u00a0 Systematic Mycology and Microbiology Laboratory, ARS. USDA.\u00a0 27 February 2006. Retrieved July 30, 2015, from \/sbmlweb\/fungi\/index.cfm .<\/p>\n

K<\/strong>illgore, E. M. and R. A. Heu. \u00a02007. \u00a0A rust disease on ‘Ohi’a, Puccinia psidii <\/em>Winter. New Pest Advisory 05-04 (Updated December 2007). Honolulu, Hawaii, USA: Hawaii Department of Agriculture. http:\/\/www.hawaiiag.org\/hdoa\/npa\/npa05-04-ohiarust.pdf<\/a><\/p>\n

M<\/strong>arlatt, R. B. and J. W. Kimbrough. \u00a01979. \u00a0Puccinia psidii<\/em> on Pimenta dioica<\/em> in south Florida. Plant Disease Reporter, 63(6):510-512.<\/a><\/p>\n

M<\/strong>ellano, V. \u00a02006. \u00a0Rust on myrtle found in San Diego County. Healthy Garden-Healthy Home. University of California Cooperative Extension Retail Nursery Newsletter, 1:3<\/p>\n

R<\/strong>oux,\u00a0 J., I. Greyling, T. A. Coutinho, M. Verleur, M. J. Wingfield.\u00a0 2013. The Myrtle rust pathogen, Puccinia psidii<\/em>, discovered in Africa. IMA Fungus, 4(1):155-159. http:\/\/www.imafungus.org\/Issue\/41\/24.pdf<\/a>.<\/p>\n

T<\/strong>essmann, D. J., J. C. Dianese, A. C. Miranda, and L. H. R. Castro.\u00a0 2001. \u00a0Epidemiology of a Neotropical rust (Puccinia psidii)<\/em>: periodical analysis of the temporal progress in a perennial host (Syzygium jambos<\/em>). Plant Pathology <\/em>50<\/strong>, 725\u2013731. doi: 10.1046\/j.1365-3059.2001.00646.x<\/p>\n

U<\/strong>SDA-PCIT.\u00a0 2015.\u00a0 United States Department of Agriculture, Phytosanitary Certificate Issuance & Tracking System (PCIT). https:\/\/pcit.aphis.usda.gov\/PExD\/faces\/ViewPExD.jsp<\/a> .<\/p>\n

Z<\/strong>ambino, P. J., and P. A. Nolan.\u00a0 2011.\u00a0 First report of rust caused by Puccinia psidii<\/em> on paperbark, Melaleuca quinquenervia<\/em>, in California.\u00a0 Plant Disease, 95:1314. http:\/\/dx.doi.org\/10.1094\/PDIS-05-11-0436<\/a>.<\/p>\n

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

John J. Chitambar, Primary Plant Pathologist\/Nematologist, California Department of Food and Agriculture, 3294 Meadowview Road, Sacramento, CA 95832. Phone: 916-262-1110, plant.health[@]cdfa.ca.gov.<\/p>\n

\n

Final Pest Rating: \u00a0C<\/h3>\n
\n

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

California Pest Rating for Puccinia psidii G. Winter (Myrtle Rust) Pest Rating: C PEST RATING PROFILE Initiating Event: A review of the current pest rating of Myrtle Rust has been requested by certain counties due to the increased detection of the pathogen within California.\u00a0 Currently, Puccinia psidii has a B rating. History & Status: Background:\u00a0 … Continue reading Myrtle Rust: Puccinia psidii G. Winter<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1117,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_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},"jetpack_post_was_ever_published":false},"categories":[8,4],"tags":[191,190],"class_list":["post-1119","post","type-post","status-publish","format-standard","hentry","category-fungi","category-plant-pathology","tag-myrtle-rust","tag-puccinia-psidii"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5l8vQ-i3","jetpack-related-posts":[{"id":1856,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1856","url_meta":{"origin":1119,"position":0},"title":"Puccinia kuehnii (W. Kr\u0171ger) E. J. Butler 1914","author":"Admin","date":"April 14, 2016","format":false,"excerpt":"California Pest Rating for Puccinia kuehnii (W. Kr\u0171ger) E. J. Butler 1914 Pest Rating: \u00a0C PEST RATING PROFILE Initiating Event: On February 9, 2016, USDA\u2019s Animal and Plant Health Inspection Service (APHIS) notified the CDFA that the rust pathogen, Puccinia kuehnii was added on February 2, 2016, to their \u2018List\u2026","rel":"","context":"In "Fungi"","block_context":{"text":"Fungi","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=8"},"img":{"alt_text":"Puccinia rusts. Photo credit: Cesar Calderon, USDA APHIS PPQ. 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Dietel (Rust) Pest Rating: D\u00a0 PEST RATING PROFILE Initiating Event: Recently, the USDA NPAG (New Pest Advisory Group) reported and evaluated the detection of Puccinia crepidis-japonicae in Gainesville, Florida, thereby, marking the first record of this pathogen in the USA.\u00a0 Subsequently, the risk\u2026","rel":"","context":"In "Fungi"","block_context":{"text":"Fungi","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=8"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":13949,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=13949","url_meta":{"origin":1119,"position":2},"title":"Puccinia carthami Corda (Syn = Puccinia calcitrapae var. centaureae) safflower rust","author":"Heather Martin","date":"June 30, 2025","format":false,"excerpt":"California Pest Rating Profile for Puccinia carthami Corda (Syn = Puccinia calcitrapae var. centaureae) safflower rust Pest Rating: C Comment Period:\u00a006\/30\/2025 through 08\/14\/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,\u2026","rel":"","context":"In "Ratings"","block_context":{"text":"Ratings","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=333"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":7555,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7555","url_meta":{"origin":1119,"position":3},"title":"Puccinia pentstemonis Peck 1885 Penstemon rust","author":"Heather.Martin","date":"September 18, 2020","format":false,"excerpt":"California Pest Rating for Puccinia pentstemonis Peck 1885 Penstemon rustPest Rating: C download pest rating *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 "C-Rated"","block_context":{"text":"C-Rated","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?cat=671"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":7718,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=7718","url_meta":{"origin":1119,"position":4},"title":"Puccinia pelargonii-zonalis Doidge 1926 Rust of pelargonium","author":"Heather.Martin","date":"October 26, 2020","format":false,"excerpt":"California Pest Rating for Puccinia pelargonii-zonalis Doidge 1926 Rust of pelargoniumPest Rating: C DOWNLOAD PEST RATING *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. 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