4 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE, 1952 
Cotton insects —Continued Pa ee 
I osecticidea for cot ton insects screened at Texas laboratory 56 
Light bollwonn damage to cotton crop 56 
Cotton aphids easily controlled 57 
< 'ut ton flea hopper unusually scarce 57 
■; ive cont rols developed for a variel \ of cotton insects 57 
Fundamental properties of cotton insecticides studied 58 
Systemic chemicals tested againsl cotton aphid and spider mites 59 
Insects affecting man 59 
Developmenl of insecticide resistance complicates mosquito control. - 59 
icides effective in controlling fire ants . 60 
• - affecting animals 60 
New approach to screw-worm control being tested in the field 60 
Dips evaluated foi control of cattle ticks 61 
Improved sprays for controlling flies affecting Livestock sought 61 
Radio isotopes used to study house fly dispersal and insecticidal resist- 
a ; ice 62 
Agricultural products tested as fly attractants 62 
Rotenone still most effective control for cattle grubs 62 
Efficacious control for mites and lice affecting poultry found 62 
Studies of toxieolomcal effects of insecticides on animals intensified. _ 63 
Insecticide investigations 64 
Best methods for residual-type spray applications studied. 64 
insecticidal vapors utilized in airplane disinsectization 64 
Nerve ganglia of house fly isolated in insecticide resistance -todies 64 
New compounds tried against house flies 65 
Toxicity of insecticides 65 
Dairy cows absorb very little insecticide from treated alfalfa hay 65 
( !hemistry of insecticide- 65 
Allethrin-related compounds synthesized and tested 65 
Vction of parathion in sod determined 66 
fnsecticidal properties of schradan studied 66 
//< liopsis yields several toxic substances 66 
No translocation in tomatoes of parathion residues in soil 66 
Spray deposits by different applicators analyzed 67 
Persistence of soil insect icides observed 67 
DDT soil content increased in sprayed orchards 67 
Insecticidal residues analyzed ^ 67 
Ethylene dibromide to be field tested for Engelmann spruce beetle 
control 68 
Aerosol formulation- tested for Licensing »>s 
V not her aerosol developed for greenhouse use 68 
improved aerosol valve designed 68 
New filtering units for respirators developed 69 
Methods of dispersing lindane vapors compared 69 
Analyses made of peanuts following cotton treated with benzene hexa- 
chloride 69 
isolation ol essential ingredient in gypsy moth lure attempted 69 
'i' plant quarantine activities 70 
Fifty thousand unauthorized airborne plant shipments intercepted 70 
Destructive pests intercepted at ports of entry 70 
Australian- and New Zealand-bound planes given predeparture clear- 
ance at Hawaii . 71 
Point-of-origin inspection of Holland-grown bulbs inaugurated 71 
Major revam] ing oi plant quarantin ■- and regulations under wa\ 72 
Increase in plants and plant products c< rtified for export 72 
Heavilj infested plane treated al Honolulu 72 
ish potatoes found ttod< 72 
;i ins peel ion 7:> 
Japai 73 
1 rap scouting detects be. -tie spread 73 
tended to inclu le < ~< "^ 
Airplanes treate I to l< stroj hitchhiki - 71 
. plant materia] certified . 74 
I xtensive foliage and soil treatments at isolated infestations 74 
■ i treatments effective for man} years. 74 
DDT and other insectii luall} lost from soils 75 
