Gl ee 
Miss. Biology and Control of Insects Affecting Dairy and Beef 
Cattle. Cattle lice--to investigate the efficiency of insecti- 
cidally impregnated back rubbers for lice control on cattle. 
Horn flies--to (1) improve the efficiency of back rubbers and 
remove hazards resulting from the use of a too harmful chemical 
on these devices for horn fly control on cattle; (2) determine 
the favorable conditions, such as those of weather, affecting a 
large horn fly population build-up; and (3) determine if horn 
flies are becoming resistant to chlorinated hydrocarbons and 
organic phosphate insecticides; Horse and deer flies--To evaluate 
the effectiveness of promising insecticides for horse and deer 
fly control, and investigate the possible use of repellents as a 
means of protecting livestock from the attacks of these pests. 
Cattle grubs--to (1) investigate host resistance among cattle to 
grub infestations; and ('2) develop a technique for infesting 
bull calves with young larvae dissected from slaughtered animals, 
as systemic research for cattle grut control would proceed much 
more rapidly if a larvae-infesting method of calves would be 
perfected. 
Ent. HH=6 
Mo. Biological Investigations and Control of the Stable Fly, 
Horse Flies, and House Flies As Animal Pests. Investigation of 
Improved Methods of Control of Mange Mites, Cattle Grubs and 
Screw Worms. To determine (1) role natural competitive factors 
play in control or lack of control of house flies with baits and 
baited sprays; (2) more attractive materials for use in house fly 
baits; (3) relative efficiency of Diazinon as residual spray and 
Diazinon as baited spray or dust in house fly control; and (4) under 
what pasture and herd conditions micro-sprayers will operate and 
control horse and horn flies most efficiently and economically. 
Ent. 46 
Mont. Biclogy and Control of Mosquitoes in Montana. To (1) study 
biology, habits, and distribution of mosquito species in Montana 
as related to their environment; and (2) use this information in 
finding economical methods for controlling mosquitoes where they 
present a health and nuisance problem to man and domestic animals. 
Zool., Ent. 4i M.S. 886 Coop. HEW-USPHS 
Nebr. Biology, Ecology and Control of the Stable Fly. To determine 
biology and ecology of stable fly, a pest of livestock and develop 
more practical measures for its control. 
Ent. 442 
