BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 3 
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Insect resistance to insecticides 35 
Extensive search for insecticides capable of controlling resistant 
house flies 35 
Insect metabolism of DDT apparently not primary factor in re- 
sistance 35 
Chlordane-resistant roaches tested 36 
Physiological data on insects tabulated 36 
Cereal and forage insects 36 
Grasshopper control and research 36 
Upsurge in range grasshoppers predicted 36 
Extensive rangeland programs completed 37 
Two sprays on marginal areas may give adequate grasshopper 
control in wheat 38 
Grasshopper diseases identified 38 
Good initial grasshopper kills obtained with several insecticides. 38 
Mormon cricket control 39 
Mormon crickets controlled in five western States 39 
Three new toxicants tested in Mormon cricket bait 39 
Cutworms 39 
Cooperative work with wheat develops hessian fly-resistant strains.- 39 
Insecticides tested against corn earworm 39 
Resistance of corn to corn earworm 40 
European corn borer research 40 
Corn strains tested for corn borer resistance 40 
New insecticides effective against corn borer 40 
Parasites aid in control of European corn borer 41 
Insect-proof selfing bag benefits sorghum breeders 41 
Entomologists test cereal grains for resistance to greenbugs 41 
Cultural and insecticidal controls effective against brown wheat mite_ 42 
Four insect vectors may be involved in transmission of wheat yellow 
streak mosaic 42 
Practical control measures sought for legume pests 43 
Alfalfa selections excel in resistance to pea aphid 44 
Sugarcane borer infestations reduced by use of resistant varieties 44 
Introduced sugarcane borer parasites released 44 
Start made toward biological control of wheat stem sawfly 44 
Physiological resistance to wheat stem sawfly apparent in one wheat 
variety 45 
Truck-crop and garden insects 45 
Potato psyllids traced to southern breeding grounds 45 
Sweetpotato weevil control 45 
Several insecticides effective in controlling sugar-beet root maggot 46 
Experiments concluded on effects of insecticides on tobacco rotations.. 46 
Residual effects of insecticides on subsequent tobacco crops studied. _ 46 
Parathion drench controls green June beetle in tobacco beds 47 
TDE recommended for control of horn worms on tobacco 47 
DMC promising for cyclamen mite control on some greenhouse plants. 48 
Multipurpose dust mix for roses sought 48 
Develop soaking treatments for tulip bulb aphid 48 
Chlordane soil treatment prevents ant reinfestation for several weeks. 48 
Several treatments give satisfactory narcissus bulb fly control 48 
Quick kill of Mexican bean beetles obtained with several insecticides.. 49 
Insecticides control cabbage aphid 49 
Recommended procedures reduce pickleworm injury 49 
Treatments for onion maggots increase onion seed yields 49 
New insecticides evaluated for pea aphid and pea weevil control 50 
Green peach aphids show signs of insecticide resistance 50 
Further studies needed on Systox as potato aphid control 50 
Wireworm control effective for several years 51 
Improved feeder devised for duster 51 
Spray equipment evaluated for pea aphid control 51 
Complex airplane spray distribution patterns confirmed 52 
Aerial spray application controls black bean aphid 52 
Washes tested for removing insects from harvested vegetables 52 
