SOYBEAN INSECTS 



Clover root curculio larvae were observed damaging soybeans in Mason County this 

 past week. The small, grayish -white grub stage of this insect burrows into the 

 roots and kills the plants. There are no effective "rescue" treatments. The lar- 

 vae will finish feeding shortly, then pupate and emerge as grey snout beetles. 



These beetles often migrate into soybeans from adjacent alfalfa and clover fields 

 when these are plowed or cut. The beetles feed on the soybeans, eating notches in 

 the new leaves and gouging holes in the stems. A spray of toxaphene or carbaryl 

 fSevin) will provide control if needed. 



LIVESTOCK INSECTS 



House flies and stable flies are increasing in and around livestock barns and sheds. 

 These flies will be nuisances until late September or early October. Both species 

 spend the majority of their time resting on walls, ceilings, support posts, fences, 

 feed bunks, and other places and only a short time on the animals. Stable flies re- 

 duce beef or milk production by attacking the legs and bellies of animals where they 

 siphon blood, usually twice each day. House flies have little or no effect on pro- 

 duction, but are a general nuisance. 



Start control programs now, before house flies become too numerous. 



1. Practice good sanitation . Eliminate fly-breeding materials --such as manure, rot- 

 ting straw, wet hay, and feed- -as often as possible. Spreading this refuse where 

 it can dry makes it unsatisfactory for depositing eggs. When manure cannot be 

 spread frequently, cover the pile with black plastic sheets, held down with old 

 tires, sandbags, or other weights. 



2. Apply a barn spray to the point of run-off on the ceilings and walls of all live- 

 stock buildings . Also spot-spray outside around windows and doors and along fences 

 in the lot. The insecticides below are suggested for this purpose. 



Amount per 100 Length of 

 Insecticide gallons of water control 



*diazinon, 50-percent wettable powder . . 16 pounds 2 to 3 weeks 

 dimethoate (Cygon) , 23 -percent liquid 



concentrate 4 gallons 3 to 4 weeks 



fenthion (Baytex) , 45 -percent liquid . . 3 gallons 4 to 6 weeks 



Rabon, 50-percent wettable powder ... 16 pounds 2 to 4 weeks 

 Ravap, (Rabon plus dichlorvos) , liquid 



concentrate 4 gallons 2 to 4 weeks 



ronnel (Korlan) , 24 -percent liquid 



concentrate 4 gallons 1 to 2 weeks 



*Do not use in dairy barns or milk rooms. 



Use only ronnel or Rabon in poultry houses. All materials other than diazinon 

 are cleared for use in dairy, beef, swine, sheep, and horse barns. Cover feed 

 and water troughs before spraying. Do not spray animal s with these materials 

 at the dosages suggested. Remove animals before spraying the barns. Do not 

 spray the milk- storage room. 



