2 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE, 1 
Fruit and nut insects — Continued Page 
New orie \ 5 
1 .-, 
er raiticides t< itrus red mite 16 
Physiological -tud> of red scale disci Hi 
ited to chemically baited traps __. 17 
( hemical t reat nun' of nursery stock 17 
Quick* r vapor-heal process for citrus fruit -n ri 17 
More tree-owner participation in Hall scale control 17 
Truck-crop and Is 
ination probl tms of cann< rs studied 18 
Sue;" potato wee >] 19 
( ui ly top di as in beans reduced by killing beet !• afhoppi n 
10 
Control of beel leafhopper on sugj r I 20 
leafhoppi 3ociated curly top • :< mtrolled o 
loups I 21 
i treatment effective against seed-corn maggot 21 
insecticides control cabbage looper 22 
mplications in control of aphids on cabbage 22 
tiv< controls for pea aphids and pea weevils developed 22 
cticide reduces spread of potato leafroll disease by aphids 23 
Green peach aphid pr< >i of foreign vn - 23 
Dipping narcissus bulbs controls bulb fly 24 
Weevil-resistant sweetpotatoes studied 24 
Thrips infestations in tomato fruil- largely a plant-breeding problem. _ 24 
[mproved power-equipped crop dusters tested 25 
[nsecticidal dosages for wireworm control compared 25 
Further studies on i ffects of soil-applied insect icides on tobacco 25 
New insecticides tested against sev< -al tobacco insects 26 
Ways of utilizing enemies of tobacco aphid under study 26 
New compounds higl ly toxic to resistant spider mites on roses 27 
Systemic insecticide breaks down rapidly in plant 27 
Tolerance of mushrooms to different insecticides tested 27 
Practical control for pickleworm on cucumbers and squash sought 27 
Cereal and forage insects 28 
Grasshopper research and control 28 
[nsecticides protect cotton fields from grasshoppers 2s 
Grasshopper development synchronizes with abundance of food 
plants 28 
Grasshopper parasites and disease effective in limited area- 28 
Grasshoppers killed with new insecticides 29 
New trends in grasshopper-control campaign 2'.> 
Farmers and ranchers step up grasshopper control on crop and 
range Land ^ 29 
Control need- in range land area- exceed expectation 30 
Mormon crickets important only in Nevada and Utah 31 
Mormon cricket build-up indicated. 31 
Chinch bugs 32 
European corn borer research 32 
Low level of European corn borer infestation in r.>.~>l 32 
Progress in testing of borer-resistant com -train- :Y2 
European corn born- kill obtained in Laboratory with new in- 
secticides . '•*>- 
Better sweet corn due to research - .'^> 
\. w sweet corn hybrids resist coin earworm attack 33 
Sevi ral insectici Les satisfactory for corn earworm control '^'-i 
Wheats and barleys resistant to hessian fly 33 
Progress in wheat stem sawfly investigations 33 
Pro ii on sugarcane insects ; "> l 
jarcane borer infestation light in Louisiana and Florida 34 
Sugarcane i< sted for borer resistance 34 
Controls Bought for various sugarcane insects : ^i 
Improved control methods for injurious legume insects 35 
Studit - of insects attacking small grain crop- intensified 36 
igation and du ting control crain infesting insects 36 
Weeklj spraying reduce- tobacco storage Losses :; < 
