Tuesday, June 4, 2013

Warning, Armyworms Spotted in Pastures!

Doug Johnson, Extension Entomologist, University of Kentucky

Fig. 1. Armyworm

Capture of armyworm (AW) in the IPM pheromone baited traps still remains below average. Nevertheless, this does NOT mean that there are no AWs around. While economically important populations of AW are not (yet) a wide spread problem this year, the fact remains there certainly are infested fields. The question becomes which fields are infested with an economically important population size? There is only one way to know that, and that is to scout. We do know that AW feeding on pasture grass has been reported from Butler Co. and I expect, that if one looks, infested fields will be found in other areas.

Fig. 2. Fall Armyworm
Do not confuse armyworm with fall armyworm or for that matter beet armyworm, army cutworm etc. These common names can be misleading as they sound similar but represent completely different insect species, whose ’ common features are only that they often move in large masses (hence the descriptor “Army” worm) and they feed on similar plants,generally grasses such as pastures, and large grasses such as wheat, corn, sorghum, and millet.

Most often confused in Kentucky are armyworm and fall armyworm. Armyworm also called “True armyworm” is a spring pest for Kentucky and most of the eastern U.S. It overwinters as far north as Tennessee and probably southern Kentucky, then migrates northward in the warm months. Fall armyworm (FAW) is a late summer to fall pest in Kentucky. This is due to its’ inability to tolerate cold weather, requiring it to overwinter in Texas, usually south Texas, then migrate to Kentucky and northward in the warmer months. During our current time of year armyworm is the threat to pastures, wheat and corn.



Generally speaking, by this time of year, wheat is close enough to harvest that armyworm are not going to do much economic damage UNLESS they are clipping heads. Head clipping and worm feeding on the Flag and F1 leaves is the only really important damage. Control is generally warranted in wheat if 16 armyworms per four square-foot sample are found. If control is necessary, products may be found in ENT-47, Insecticide Recommendations for Small Grains (Barley, Oats, Wheat)- 2013.

Pastures could be damaged, but if growing conditions are reasonable, pastures will usually outgrow major damage. Thresholds are not well established but if an infestation does occur especially as pasture is being cut for hay, the producer should keep an eye on the regrowth. If satisfactory regrowth is occurring, and predicted weather is suitable for pasture growth, control may be avoided. If an insecticide application is warranted, products may be found in ENT-17, Insecticide Recommendations for Alfalfa, Clover and Pastures -2013. If animals are on the field, producers / applicators are cautioned to check the product label to determine if animals have to be removed from the field before application and if so, for how long.

NOTE: Do not confuse these insects with Eastern Tent caterpillar (ETC). Eastern Tent caterpillar is associated with Mare Reproductive Loss Syndrome but these two armyworms are NOT associated with this syndrome.

This year because of our long period of planting, corn may be the major plant at risk of armyworm. In addition, very late planting especially in far west Kentucky could lead to problems with Fall armyworm (but more on that story later). However, most producers are planting corn products that contain transgenic “B.t.” insect toxins. Most of these products will have good protection from armyworm. If you are planting a product that allows Refuge in a Bag (RIB) you might only notice armyworms if you see damage on the 5-10% scattered Refuge plants (those without the B.t. toxin). If you are planting a product that requires a block refuge (non- B.t. plants) or for other non-B.t. containing corn like certain food grade corns or sweet corn, you should be scouting for armyworm now! If control is warranted, corn insecticides may be found in ENT-16, Insecticide Recommendations for Corn-2013.

Insecticide Recommendations may be obtained from your County Extension Office or on line at:
http://pest.ca.uky.edu/EXT/Recs/welcomerecs.html

10 comments:

  1. Very interesting to read this article. I would like to thank you for the efforts you had made for writing this awesome article.onlinesignsupplies.co.uk |

    tartanarmymessageboard.co.uk |

    mikestoanelighting.co.uk |

    workplace-wellness.co.uk |

    thumbswood.co.uk |

    oldfieldrealty.co.uk |

    utilitysearches.co.uk |

    bizzybooker.co.uk |

    restaurantrecruit.co.uk |

    vetequip.co.uk |

    ReplyDelete
  2. One neat thing about being the first company to purchase the trucks is that Robichaud is pretty much involved in any design changes that may be made to the vehicle. visit website

    ReplyDelete
  3. 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,toms.com, 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,ralphlauren.com,polo outlet,ralph lauren polo, oakley sunglass, swarovski crystal

    ReplyDelete
  4. oakley sunglasses,cheap oakley,cheap oakley sunglasses,oakley sunglasses cheap,oakley outlet,oakley sunglasses outlet,oakley vault,oakleys,oakley.com,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,raybans.com,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,lulu.com,lululemon.com, 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

    ReplyDelete