Wednesday, March 23, 2011

Wheat Soil-Borne Mosaic Virus Prevalent

The following is in the Kentucky Pest News from Don Hershman  

By Don Hershman

Over the past few weeks, we have been getting questions about fields that look similar to Fig. 1.  Initially, we thought the problem was related to nitrogen deficiency in areas of fields that were subject to water saturation. In some cases, inadequate availability and/or uptake of nitrogen may be the culprit. However, we have since determined that most of the fields exhibiting patches of stunted and yellowed plants are most likely affected by Wheat Soil-borne Mosaic Virus (WSBMV).  We have come to this conclusion based on samples from symptomatic fields that have tested positive for WSBMV using a very reliable antibody-based diagnostic test known as ELISA.  

Fig. 1.   Wheat field exhibiting areas of plant yellowing caused by Wheat Soil-borne Mosaic Virus.

WSBMV is transmitted to wheat by a very common soil-borne fungus, Polymyxa graminis. P. graminis itself does not harm wheat.  WSBMV symptoms first appear as crops begin to “green up” in late February to early March.  Leaves of affected plants exhibit a mild green to prominent yellow mosaic pattern (Fig. 2). Infected leaves may be somewhat elongated and have rolled edges; tillering of plants may be reduced.  Symptoms tend to fade as the weather warms up, but in severe cases plants will be permanently stunted. Symptoms caused WSBMV can occur throughout fields, but are usually most severe in poorly drained or low areas. This is because infection of seedlings by P. graminis is favored by high soil moisture.  
​The extent of yield loss caused by WSBMV depends on how much of the crop is affected and the severity of symptomatic plants.  In mild cases, yield effects will be barely noticeable.  However, if symptomatic areas persist and make up a significant portion of the field’s surface area, yield losses may be substantial.  Part of the dilemma at this time is the difficulty in knowing if affected fields should be destroyed and replanted to corn or soybean, or maintained in wheat.  With considerable financial resources yet to be spent on wheat this spring, as well as the cost of replanting, this is no small decision.  Unfortunately, there is no sure way to determine how much yield loss will be caused by WSBMV in affected fields.  However, fields like the one shown in Fig. 1 would be a good candidate for replanting.  

Fig. 2. Symptoms in wheat leaves caused by Wheat Soil-borne Mosaic Virus.

Decisions to manage WSBMV must be made in the fall, before planting.  The best and most consistent results are achieved by planting wheat varieties that are resistant to WSBMV (or “soil-borne viruses”). Delaying planting operations past the “Hessian fly-free date” in the fall can also help by limiting the extent of fall infections.  Fields with persistent WSBMV problems may be helped by improving internal and surface drainage of fields.          


  1. Thanks very much for the share & keep posting such an informative articles. I'm looking forward to your blog. Thanks! Teenager auto insurance

  2. very have provided very useful tips for Mosaic Virus treatment. keep posting!

  3. This topic has been something I have been looking into for a few hours and your post is one of the best I have read.rn-ds-partnership |

    prepaybank |

    calleija |

    dontdothedodo |

    intelligentformulation |

    caphe-vn |

    futrets |

    auction-expert |

    sail-lizziemay |

    dubai-realestate |

    scottishpoet |

  4. nike shoes, Cheap Jordans,Cheap Jordan Shoes,Cheap Air Max,Cheap Free Run Shoes,nike shoes,nike outlet,nike factory,nike store,nike factory outlet,nike outlet store,cheap nike shoes,nike sneakers, toms outlet, toms outlet,tom shoes,toms shoes outlet,tom shoes,toms wedges,cheap toms,, air jordan, air jordan,jordan shoes,cheap jordans,air jordans,jordan retro,air jordan shoes,jordans,jordan 11,jordan xx9,jordan 6,new jordans,retro jordans,jordan retro 11,jordan 5,air jordan 11,jordans for sale,jordan 4,jordan 1,jordan future,jordan 3,jordan 12,michael jordan shoes,air jordan retro, cheap jordans, cheap jordans,cheap jordan shoes,cheap jordan,cheap jordans for sale,jordans for cheap,jordan shoes,jordans,air jordan,jordan retro,jordan 11,jordan xx9,jordan 6,new jordans,air jordans,retro jordans,jordan retro 11,jordan 5,air jordan 11,jordans for sale,jordan 4,jordan 1,jordan future,jordan 3,jordan 12,michael jordan shoes,air jordan shoes,air jordan retro, jordan retro, jordan retro,jordan shoes,air jordan,air jordans,retro jordans,air jordan retro,jordans,jordan 11,jordan xx9,jordan 6,new jordans,cheap jordans,jordan retro 11,jordan 5,air jordan 11,jordans for sale,jordan 4,jordan 1,jordan future,jordan 3,jordan 12,michael jordan shoes,air jordan shoes, air max 90, air max 90,nike air max 90,air max 95,air max 2014,air max 2013,air max 1,nike air max,air max,nike air max 2014,airmax,nike air max 2013, air max 95, air max 95,nike air max 95,air max 90,nike air max 90,air max 2013,nike air max,air max,air max 2014,nike air max 2014,airmax,nike air max 2013, nike free 5.0, nike free 5.0, nike free trainer 5.0,nike free run 5.0,free running 2,nike free run,nike free,free running,nike running shoes,nike free trainer,free runs,free run 5.0, omega watches, omega watches,omega watch,replica watches,rolex watches,replica omega watches,rolex,watches for men,watches for women,rolex watches for sale,rolex replica,rolex watch,cartier watches,rolex submariner,fake rolex,rolex replica watches,replica rolex, ralph lauren outlet, ralph lauren outlet,ralph lauren outlet online,polo ralph lauren outlet,polo ralph lauren outlet online,polo ralph lauren,ralph lauren,polo ralph,polo shirts,,polo outlet,ralph lauren polo, oakley sunglass, swarovski crystal

  5. oakley sunglasses,cheap oakley,cheap oakley sunglasses,oakley sunglasses cheap,oakley outlet,oakley sunglasses outlet,oakley vault,oakleys,,sunglasses outlet,cheap sunglasses,oakley prescription glasses,fake oakleys,oakley glasses,oakley store,fake oakley,oakley sale,cheap oakleys,discount oakley sunglasses, ray ban sunglasses, Ray Ban Sunglasses,Ray Ban Outlet,Ray Ban Sale,Cheap Ray Bans,Cheap Ray Ban Sunglasses,ray ban sunglasses outlet,ray ban,rayban,ray bans,ray-ban,raybans,ray ban wayfarer,ray-ban sunglasses,,rayban sunglasses,cheap ray ban, burberry, burberry,burberry outlet,burberry outlet online,burberry factory outlet,burberry sale,burberry handbags, chanel bags, chanel bags,chanel handbags,chanel sunglasses,chanel outlet,chanel purses,chanel handbags official site, coach outlet store, coach outlet,coach outlet store,coach outlet store online,coach outlet stores,coach factory outlet,coach factory,coach factory online,coach factory outlet online,coach outlet online, chaussures louboutin, louboutin,louboutin pas cher,christian louboutin,louboutin chaussures,louboutin soldes,chaussure louboutin,chaussures louboutin,chaussure louboutin pas cher,louboutin france, sac michael kors, michael kors,sac michael kors,michael kors sac,michael kors pas cher,sac michael kors pas cher,michael kors france, north face outlet, north face outlet,the north face,north face,the north face outlet,north face jackets,north face jackets clearance,northface, yoga pants, yoga pants,lululemon,lululemon outlet,lululemon athletica,lululemon addict,lulu lemon,,, beats by dre, beats by dre,beats headphones,beats audio,beats by dr dre,beats by dre headphones,dr dre,dre beats,beats by dr,dr dre beats,dre headphones,beats by dr. dre,cheap beats, ferragamo, ferragamo,salvatore ferragamo,ferragamo shoes,ferragamo outlet,salvatore ferragamo outlet,ferragamo belts,ferragamo belt,ferragamo outlet, nike blazer, nike blazer,blazer nike,nike blazer pas cher,Chaussures Nike Blazer,Nike Blazer Femme, nike air force, swarovski