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Stripe rust on wheat in Nebraska,USA

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Publish time: 12th June, 2015      Source: A ProMED-mail post<http://www.cnchemicals.com/;
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Stripe rust on wheat in Nebraska,USAStripe rust on wheat in Nebraska,USA" title="Share this link on Facebook">A ProMED-mail post<http://www.cnchemicals.com/;ProMED-mail is a program of theInternational Society for Infectious Diseases <http://www.cnchemicals.com/rg>Date: Wed 10 Jun 2015Source: Midwest Producer [edited]<http://www.midwestproducer.com/news/crop/severe-levels-of-stripe-rust-found-in-wheat-fields-across/article_14c043c8-0fb5-11e5-a18a-cbf066ecae6c.html>A survey of wheat fields in southeast, south central, and southwest Nebraska showed severe levels of stripe rust. In some fields, 100 percent of foliage was yellow and covered with rust pustules, with only the stems and heads retaining green color. In some fields rust had advanced to the [late] stage where teleospores form.Many of the fields with severe stripe rust were not sprayed with fungicide or were sprayed too late. Further west and north, stripe rust was not as severe as in the southeast or south central, but its development was picking up speed. Fields that were sprayed had little or no rust.The overall estimated yield loss due to stripe rust will not be known until later in the growing season. However, in the severely affected fields surveyed, 40 to 50 percent yield loss is expected. In some fields severely diseased before the beginning of grain fill, higher losses are expected.Weather conditions continue to favor stripe rust development and spread. It is too late to treat fields that are severely affected.[Byline: S. Wegulo, T. Adesemoye, R. Klein]--Communicated by:ProMED-mail<promed@promedmail.org>[Stripe rust (also called yellow rust) of cereals is caused by the fungus _Puccinia striiformis_ (previously var. _striiformis_ or _tritici_). The disease affects wheat, some barley varieties, triticale, and a number of wild grasses. It causes yellow leaf stripes, loss of plant vigour, and stunting of plants with yield losses of 40 to 100 per cent in wheat.Spores are wind dispersed in several cycles during the cropping season. Grasses and volunteer crop plants may generate a "green bridge," providing inoculum for the next crop cycle. Disease monitoring is important so timely action can be taken to limit the spread of the pathogen as well as build-up of inoculum. Disease management may include the use of resistant varieties, fungicide applications and control of pathogen reservoirs.New pathogen strains with increased virulence and additional fungicide resistances have been reported in recent years from wheat-growing areas worldwide. Monitoring and resistance breeding programmes have been established in different regions for early detection of new rust strains and to attempt to stay ahead of pathogen evolution.In the report above, it is unclear why farmers neglected to apply preventative fungicide sprays in the areas surveyed. The current outbreak is, therefore, not surprising and cannot be attributed to a new fungal strain.MapsUSA:<http://www.mapsofworld.com/usa/usa-state-and-capital-map.html>Nebraska:<http://www.mapsofworld.com/usa/states/nebraska/nebraska-map.html>PicturesStripe rust symptoms on wheat:<http://www.grdc.com.au/uploads/images/Stripe%20rust%20Colin%20Wellings%20ACRCP.JPG>,<http://www.plantmanagementnetwork.org/pub/php/brief/2005/stripe/image/wheat3.jpg>and<http://www.uky.edu/Ag/GrainCrops/Images/7/7.11.jpg>Ryegrass with stripe rust:<http://www.science.oregonstate.edu/bpp/Plant_Clinic/images/ryegrass_stripe%20rust.jpg>and<http://plant-pest-advisory.rutgers.edu/wp-content/uploads/2013/09/photo-15-e1378922274640.jpg>LinksInformation on wheat stripe rust:<http://pnw-ag.wsu.edu/smallgrains/Stripe%20Rust.html>,<http://www.ars.usda.gov/Main/docs.htm?docid=9918&pf=1&cg_id=0> and <http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0006/158964/stripe-rust-in-wheat.pdf>Stripe rust management:<http://www.grdc.com.au/uploads/documents/striperustmgt.pdf> and <http://www.ipm.ucdavis.edu/PMG/r730100511.html>_P. striiformis_ life cycle:<http://www.nature.com/ncomms/2013/131023/ncomms3673/images/ncomms3673-f1.jpg>Stripe rust global tracking service:<http://rusttracker.cimmyt.org/?page_id=9>Stripe rust, current USA state updates via:<http://www.ars.usda.gov/Main/docs.htm?docid=9757>_P. striiformis_ taxonomy and synonyms:<http://www.indexfungorum.org/Names/NamesRecord.asp?RecordID=227064>and<http://www.speciesfungorum.org/Names/SynSpecies.asp?RecordID=227064>- Mod.DHAA HealthMap/ProMED-mail map can be accessed at:<http://healthmap.org/promed/p/229>.][See Also:Stripe rust, wheat - Pakistan, Mexico 20150530.3396665 Stripe rust, wheat - India: (JK) 20150323.32478752014----Stripe rust, cereals - France 20140616.2543141 Stripe rust, wheat - Spain: (CL) Warrior strain 20140523.2489629 Undiagnosed rust, wheat - Pakistan: (KP) 20140321.2346029 Stripe rust, wheat - UK: Warrior strain, alert 20140122.2224928 Stripe rust, wheat - India: (PB, HR) 20140109.21626932013----Stripe rust, wheat - India: (PB) 20130118.15038582012----Stripe rust, wheat & triticale - Switzerland 20121004.1322743 Stem & stripe rusts, wheat: double resistance breeding20120831.1274190Stripe rust, triticale - Denmark: new strain susp 20120426.1114329 Leaf & stripe rusts, wheat - UK: new strains 20120208.1036727 Stripe rust, wheat - India: update 20120122.10179732011----Barley diseases - India: (JK) survey 20111201.3497 Stripe rust, barley - Australia: (NS) 20111103.3270 Stripe rust & foot rot, wheat - USA, UK 20110713.2109 Stripe rust, wheat - India, UK: spread 20110404.1042 Stripe rust, wheat - UK: (England), Claire strain 20110304.0705 Fungal diseases, cereals - Australia: (eastern, south) alert20110218.0531Stripe rust, wheat - India: (PB) 20110211.0469 and older items in the archives]More news from: ISID (International Society for Infectious Diseases)Website: http://www.cnchemicals.com/rgPublished: June 12, 2015The news item on this page is copyright by the organization where it originatedFair use notice