{"id":1226,"date":"2015-10-19T15:40:29","date_gmt":"2015-10-19T22:40:29","guid":{"rendered":"http:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1226"},"modified":"2024-04-26T11:18:37","modified_gmt":"2024-04-26T18:18:37","slug":"melampsoridium-hiratsukanum-s-ito-ex-hirats-f-alder-rust","status":"publish","type":"post","link":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1226","title":{"rendered":"Melampsoridium hiratsukanum S. Ito ex Hirats. f., (Alder Rust)"},"content":{"rendered":"
California Pest Rating<\/strong><\/h5>\n
Melampsoridium hiratsukanum<\/em><\/strong> S. Ito ex Hirats. f.,<\/strong><\/h5>\n
(Alder Rust)<\/strong><\/h5>\n
Pest Rating: \u00a0C<\/h5>\n
\n
PEST RATING PROFILE<\/strong><\/h5>\n
Initiating Event: <\/strong><\/h5>\n

The pest rating of Alder Rust has been raised by certain counties and related nurseries due to its increased spread within California.\u00a0 Currently, Melampsoridium hiratsukanum<\/em> has a temporary Q rating that is herein reconsidered for a permanent rating.<\/p>\n

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

Background<\/strong>:<\/u>\u00a0 Three Melampsoridium<\/em> species are reported as causing foliar rust on alder (Alnus<\/em> spp.) namely, M. alni, M. betulinum and M<\/em>. hiratsukanum<\/em>. Confusion has existed on the distinct identity of the species as all three are morphologically similar.\u00a0 This confusion has caused doubt about the authenticity of many older records.\u00a0 However, since the late 1990s, the use of DNA analysis has confirmed the identities of the three species. Melampsoridium hiratsukanum<\/em> belongs to the family Pucciniastraceae in the order Pucciniales. \u00a0The species was first described on Manchurian alder (A.hirsuta<\/em>) from Hokkaido in Japan in 1927.<\/p>\n

Disease cycle:<\/strong> <\/u>\u00a0Melampsoridium hiratsukanum<\/em> is a heteroecious rust that produces two different fruiting bodies (uredinia and telia) on the leaves of its main host alder (Alnus<\/em> spp.) and two different fruiting bodies (spermagonia and aecia) on its alternate host larch (Larix<\/em> sp.).\u00a0 On alder, the fungal species forms uredinia which give rise to urediniospores.\u00a0 These spores are produced repeatedly and form the major stage for reproduction and dispersal.\u00a0 Urediniospores are the only spores that re-infect their same host plant repeatedly.\u00a0 Later, the pathogen produces the sexual, overwintering fruiting body structure or telia which give rise to thick-walled teliospores.\u00a0 During the following spring, teliospores germinate forming a basidium which produces haploid basidiospores.\u00a0 Basidiospores may infect young needles of larch (Larix<\/em> spp.) and develop to form spermogonia – which form pycniospores or spermatia and receptive hyphae.\u00a0 Following fertilization of spermatia and compatible receptive hyphae, dikaryotic mycelium is produced which forms aecia that produce aeciospores. Aeciospores may infect alder but not other larch or Larix<\/em> spp. On infection, aeciospores produce more dikaryotic mycelium that this time forms uredinia that produce urediniospores thereby completing the life cycle.<\/p>\n

The fungal pathogen may also exhibit a shortcut life cycle especially where the alternate aecial host (Larix <\/em>spp.<\/em>) is not present.\u00a0 In such situations, the life cycle of the pathogen is completed on alder alone without the need of the alternate host and is therefore, reproduces and spreads only through the production of urediniospores.\u00a0 Such may be the situation with the occurrence of the disease on alder plants in California nurseries.\u00a0 The pathogen has not been reported on an alternate host in California.\u00a0 It is likely that the urediniospores re-infect fresh alder leaves thereby enabling their survival and perpetuating the disease through a rapid build-up of inoculum. \u00a0Such a shortcut life cycle is known for many rust fungi with alternate hosts and is assumed to occur in Austria and Hungary (NOBANIS, 2007; Szabo, 2002).<\/p>\n

Dispersal and spread<\/em>:\u00a0 Alder may be infected by aeciospores, or as discussed above for California, it may be infected with urediniospores produced in other alder plants.\u00a0 Also, it may survive as mycelium infecting buds or with urediniospores.\u00a0 The rust fungus spreads from plant to plant mainly by windblown spores.\u00a0 Urediniospores are formed repeatedly and in abundance and may be transmitted over several hundred kilometers by strong winds and then washed down by rain on to host plants that are readily infected.\u00a0 Aeciospores are also capable of long distance dispersal.\u00a0 Over the past 10 years, the introduction and rapid spread of the pathogen in Europe was most likely due mainly to dry airborne spores, although specific distances have not been reported (Lane et al<\/em>., 2013).\u00a0 Infected nursery stock or plantings also provide a means for long distance spread of the pathogen which is capable of surviving in bud scales in dormant buds.<\/p>\n

Hosts:<\/em>\u00a0 Alder (Alnus <\/em>spp.), Black, European or common alder (Alnus glutinosa<\/em>), Manchurian alder (A. hirsuta<\/em>), Grey or Speckled alder (A. incana<\/em>), Red alder (A. rubra<\/em>) (EPPO, 2014), white alder (A. rhombifolia<\/em>) (Blomquist et al<\/em>., 2014); Larch (Larix<\/em> spp.), Dahurian larch (L. gmelinii<\/em>), <\/em>Siberian larch (L. russica<\/em>) (EPPO, 2014) and White or Downy birch (Betula pubescens<\/em>) (Lane et al<\/em>., 2013).\u00a0 Experimental hosts: European larch (L. decidua<\/em>), <\/em>Tamarack or American larch (L. laricina<\/em>) (Lane et al<\/em>., 2013).<\/p>\n

Symptoms and damage potential<\/em>:\u00a0 Infected white alder leaves exhibit numerous small orange-yellow uredinia pustules on the lower leaf surfaces, with corresponding yellow to orange spots on the upper surface.\u00a0 Later, leaves turn dark brown and curl inwards with the production of telia.\u00a0 Infected leaves often turn yellow, die and sometimes drop prematurely. The disease causes considerable damage to alder foliage in late summer causing them to be easily distinguished from a distance.\u00a0 Repeated infections can cause defoliation and crown thinning leading to tree death (Lane et al<\/em>., 2013).<\/p>\n

Worldwide Distribution<\/u><\/strong>:\u00a0Records of the detection of M. hiratsukanum<\/em> prior to 2005 may be dubious due to taxonomic difficulty that existed in distinguishing it from other closely related species, viz. M. alni<\/em> and M. betulinum <\/em>without using molecular analysis.\u00a0 Many records prior to 2005 may have been of M. betulinum<\/em> (Lane et al<\/em>., 2013).\u00a0 Nevertheless, it is probable that M. hiratsukanum<\/em> originated in Eastern Asia and has spread to temperate regions of Europe and North America.\u00a0 Reliable records of the global distribution of M. hiratsukanum<\/em> (EPPO, 2014) include:<\/p>\n

Asia<\/em>: China, Japan, Nepal (Adhikari & Manandha, 1989; EPPO, 2014)<\/p>\n

Europe<\/em>: Austria, Czech Republic, Estonia, Finland, France, Germany, Hungary, Italy, Latvia, Lithuania, Norway, Poland, Romani, Russia, Slovakia, Switzerland, Turkey, Ukraine, UK.<\/p>\n

North America<\/em>: Canada, USA (California and Oregon:\u00a0 Bloomquist et al<\/em>., 2014; Pscheidt & Ocamb, 2013).\u00a0 Most likely, it is widespread in nurseries of western US coastal states (Blomquist 2014: pers. comm<\/em>.)<\/p>\n

Official Control<\/u><\/strong>: Currently, there are no reports of official control imposed against Melampsoridium hiratsukanum<\/em>.<\/p>\n

California Distribution<\/u><\/strong>:\u00a0 Melampsoridium hiratsukanum<\/em> is most likely widespread on alders in California nurseries (Blomquist 2014:<\/em> pers. comm.<\/em>). The pathogen has been in California since 1931 and a first published report was issued in 2014 of its detection in white alder from a nursery in Santa Cruz County (Blomquist et al<\/em>., 2014).\u00a0 However, disease symptoms on trees caused by the pathogen have not been found in California wild lands \u2013 mainly due to the absence to high moisture conditions necessary for the perpetuation of the disease in its natural habitat.<\/p>\n

California Interceptions<\/u><\/strong>:\u00a0 The pathogen has been in California since in the 1931 as evident by a sample that was submitted to the Federal Herbarium in Beltsville, MD.\u00a0 However, this sample had been misidentified, and later, when it was correctly identified the revised identification was never published. \u00a0The pathogen has also been found in several locations in California Central Valley.<\/p>\n

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

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

\u00a01) Climate\/Host Interaction<\/span>: <\/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.<\/p>\n

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

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

Risk is High (3)<\/span>:\u00a0 <\/em><\/strong>Melampsoridium hiratsukanum<\/em> is already established and suspected to be widely distributed wherever alder is grown in California nurseries.\u00a0 The pathogen has not been found in California wild lands.<\/p>\n

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

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

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

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

Risk is Low (1)<\/span>: <\/em><\/strong>The host range is mainly limited to alder and larch trees. Only a few records of its occurrence on birch are from Europe (U.K.).\u00a0 In California, the pathogen has only been found on alder.\u00a0\u00a0 \u00a0\u00a0<\/strong><\/em><\/p>\n

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

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

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

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

Risk is High (3)<\/span>: <\/em><\/strong>Alder Rust has high reproduction and dispersal potential via 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<\/em><\/p>\n

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

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

– Medium (2)<\/strong> causes 2 of these impacts.<\/span><\/p>\n

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

Risk is Medium (2)<\/span>: <\/em><\/strong>Trees infected with <\/em>Melampsoridium hiratsukanum could cause significant loss of foliage, thereby generally reducing their yield and value in nursery productions.<\/em><\/p>\n

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

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

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

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

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

Risk is <\/em><\/strong>Medium (2)<\/span>:<\/em><\/strong> Alder rust has been in California since 1931, although the pathogen was misidentified.\u00a0 Although it is difficult to find nursery alder trees that are not infected with the pathogen, according to Dr. Cheryl Blomquist (CDFA, pers. comm.), this rust pathogen has not been found in the wild lands, and no significant impact to California\u2019s environment has been reported.\u00a0 Nevertheless, it may cause significant concern for home\/urban gardens or ornamental settings. <\/em><\/p>\n

Consequences of Introduction to California for Alder Rust:<\/strong><\/h5>\n

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

-Low = 5-8 points<\/p>\n

–Medium<\/strong> = 9-12 points<\/span><\/p>\n

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

Total points obtained on evaluation of consequences of introduction to California = 11 (Medium)<\/span>.<\/strong><\/p>\n

6) Post Entry Distribution and Survey Information<\/span>:<\/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.<\/p>\n

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

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

-High (-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

Evaluation is Medium (-2)<\/span>.\u00a0 <\/em><\/strong>Melampsoridium hiratsukanum is widespread in California nurseries, but has not been detected in wild lands.<\/em><\/p>\n

Final Score:<\/h5>\n

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

Final Score: <\/em><\/strong>\u00a0Score of Consequences of Introduction \u2013 Score of Post Entry Distribution and Survey Information =<\/strong> 8.<\/strong><\/span><\/em><\/p>\n

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

\u00a0<\/strong>While Melampsoridium hiratsukanum<\/em> has been in California since 1931, it was not possible to distinguish it from M. alni<\/em> and M. betulinum<\/em> based on morphology alone.\u00a0 The latter two species have been reported earlier from California.\u00a0\u00a0 It may well be those earlier detections are, in fact, M. hiratsukanum <\/em>which have yet to be molecularly differentiated.\u00a0 If this is determined to be so, then it will only strengthen the proposed C rating for this pathogen, as also will its detection in California\u2019s wild land habitats.<\/p>\n

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

Based on the evidence provided above the proposed rating for Alder Rust is C.<\/strong><\/p>\n

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

A<\/strong>grios, G. N.\u00a0 2005.\u00a0 Plant Pathology Fifth Edition.\u00a0 Elsevier Academic Press, USA.\u00a0 922 p.<\/p>\n

B<\/strong>lomquist, C. L., H. J. Scheck, J. Haynes, P. W. Woods and J. Bischoff.\u00a0 2014.\u00a0 First published report of rust on white alder caused by Melampsoridium hiratsukanum<\/em> in the United States.<\/p>\n

E<\/strong>PPO.\u00a0 \u00a02014.\u00a0 Melampsoridium hiratsukanum<\/em> (MELDHI).\u00a0 PQR database.\u00a0 Paris, France: European and Mediterranean Plant Protection Organization. \u00a0http:\/\/www.newpqr.eppo.int<\/a>.<\/p>\n

L<\/strong>ane, C., S. Matthews Berry and H. Anderson.\u00a0 2013.\u00a0 Rapid pest risk analysis for Melamsoridium hiratsukanum<\/em>.\u00a0 The Food & Environment Research Agency, Version 3, March, 2013.<\/p>\n

N<\/strong>OBANIS.\u00a0 2007.\u00a0 Melampsoridium hiratsukanum<\/em>.\u00a0 NOBANIS \u2013 Invasive Alien Species Fact Sheet.\u00a0 http:\/\/www.nobanis.org\/files\/factsheets\/Melampsoridium_hiratsukanum.pdf<\/a>.<\/p>\n

P<\/strong>scheidt, J. W. and C. M. Ocamb.\u00a0 2013.\u00a0 Pacific Northwest Plant Disease Management Handbook.\u00a0 URL: pnwhandbooks.org\/plantdisease\/node\/2616.<\/p>\n

S<\/strong>zabo, I.\u00a0 2002.\u00a0 First report of Melampsoridium hiratsukanum<\/em> on common alder in Hungary.\u00a0 Plant Pathology, 51:804.<\/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

\u00a0Pest Rating: \u00a0C<\/h3>\n
\n

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

California Pest Rating Melampsoridium hiratsukanum S. Ito ex Hirats. f., (Alder Rust) Pest Rating: \u00a0C PEST RATING PROFILE Initiating Event: The pest rating of Alder Rust has been raised by certain counties and related nurseries due to its increased spread within California.\u00a0 Currently, Melampsoridium hiratsukanum has a temporary Q rating that is herein reconsidered for … Continue reading Melampsoridium hiratsukanum S. Ito ex Hirats. f., (Alder Rust)<\/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_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":[214,46,213,45],"class_list":["post-1226","post","type-post","status-publish","format-standard","hentry","category-fungi","category-plant-pathology","tag-alder-rust","tag-fungi-2","tag-melampsoridium-hiratsukanum","tag-plant-pathogen"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5l8vQ-jM","jetpack-related-posts":[{"id":9114,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=9114","url_meta":{"origin":1226,"position":0},"title":"Pucciniastrum actinidiae Hirats. f. 1952 Rust of kiwifruit","author":"Heather.Martin","date":"October 27, 2021","format":false,"excerpt":"California Pest Rating for Pucciniastrum actinidiae Hirats. f. 1952 Rust of kiwifruitPest Rating: A DOWNLOAD PEST RATING *NOTE You must be registered and logged in to post a comment. 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If you have registered and have not received the registration confirmation,\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":[]},{"id":1006,"url":"https:\/\/blogs.cdfa.ca.gov\/Section3162\/?p=1006","url_meta":{"origin":1226,"position":2},"title":"Phytophthora siskiyouensis Reeser & E. M. Hansen, 2008","author":"Admin","date":"June 1, 2015","format":false,"excerpt":"California Pest Rating for Phytophthora siskiyouensis Reeser & E. M. 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