Browse on keywords: insect hessian fly
Search results on 07/22/18
6499. Smith, Larry. May 1990. Hessian fly.. Farm Scene, UI Nez Perce Co. Extension newsletter.
Infestations of Hessian fly in the PNW have largely been restricted to the irrigated areas. Wheat is the preferred host for the insect. There are usually 2 spring generations, thus making spring wheat more susceptible to damage. Oats are not infested, and barley and rye suffer little damage. The fly feeds on the juices of the stem tissue at the crown of young plants or above the nodes on jointed plants. Tiller development can be reduced by feeding. Economic grain losses can occur if more than 20% of tiller are infested. Crop loss has been found to increase where wheat, mostly spring wheat, is seeded into wheat stubble or reduced tillage. Tillage operations which bury residue prevent emergence of the fly. Resistant varieties of spring wheat are available, and Wakanz, WPB906R and WPB926 have shown yield increases of up to 65% over susceptible lines. Tables on field results of variety screening are included.