ANNUAL RKPORTS OF DEPARTMENT OF AGRICULTURE, 1953 
Cotton insects — Continued Pape 
lioll weevil damage relatively light 15 
Stalk destruction important in boll weevil control 15 
spray combinations effective against many cotton insects 16 
Search on for new chemicals to control cotton insects 16 
Insecticides field-evaluated against boll weevil 17 
Satisfactory bollworm control obtained with several sprays 17 
Extra spray required to control migrating cotton fleahoppers 18 
Insect problems in irrigated cotton areas 18 
Sprays give good initial and residual control of thrips on cotton 19 
Unusually heavy spider mite infestations in cot ton 19 
Forest insects 19 
Ponderosa pine susceptibility to beetle attack depicted by foliage 
color 19 
Available soil moisture closely associated with bark beetle attack 20 
New epidemic of Engelmann spruce beetle in northern Rockies 20 
Simplified Engelmann spruce beetle spray fulfills expectations 20 
Trap trees may be useful in Engelmann spruce beetle control 20 
Two nematodes found parasitizing Engelmann spruce beetle 21 
Pacific Northwest has its worst epidemic of Douglas-fir beetle 21 
Bark beetle ground-survey methods improved 21 
Same recommendations continue for black turpentine beetle control., 22 
Residual sprays toxic to western pine beetle 22 
Artificial virus infection highly lethal to European pine sawfly 22 
Tent caterpillars absolved in wild black cherry destruction 22 
Treated wood still termite-proof after twenty years 22 
Soil poisons developed for termite protection 23 
Termite treatment developed for wallboard and insulation panels 23 
Spray reduces feeding of Dutch elm disease vector 23 
Special device converts helicopter to an airborne mist blower 23 
Highly atomized aerial spray gives most uniform distribution 24 
Dyed cards used to check sufficiency of aerial spray deposits 24 
Benefits of airplane spraying for spruce budworm control persist 24 
Insects affecting man 24 
Mosquitoes tested for insecticide resistance 24 
Insecticides highly effective in destroying imported fire ant colonies. _ 25 
Heptachlor effective against sand flies in Florida 26 
Insecticides tested against salt-marsh mosquitoes 26 
Orlando facilities expanded 26 
Insects affecting livestock 26 
Various insecticides tested against livestock pests 26 
Injections of insecticides into animals to control insect pests 27 
Screw-worm sterilization studies continued 28 
Toxicology of insecticides 28 
Methoxychlor-sprayed hay safelv fed to dairy cows 28 
Toxicological effects of insecticides on livestock Investigated 29 
Geese most Buseeptible to aldrin and toxaphene 30 
CS-708 studied bs a dairy barn spray. 30 
Dieldrin-treated fly strips safe for dairy barn use 31 
Chemical Btudies of insecticides 31 
bructural change in molecule detoxifies affinin si 
Synthetic organic compounds tested as insecticides. si 
Lindane formulations and analysis improved si 
Synergists for allethrin evaluated 
AerOSOl formulas licensed , 83 
ithion purification process patented 82 
Three manufacturers now producing Bureau-synthesized Insecticide.. 32 
Crops analysed for insecticide residues . 82 
( Sorrosivs properties of aerosol Bpray eliminated M 
Three-hour exposure to lindane vapor kills nonresistant house flies . 34 
■ rimental aerosol valves tested _ 84 
New-type respirators tested againsl poisonous aerosols M 
Prospective Insecticide diluents examined 35 
