Appendix 167 



should be made about every 2 or 3 weeks, or as often as the 

 inseas reappear. 



FOREST TREES 



(See TREES) 



CRAPES 

 Leaf Hopper Control 



Apply a straight 3 % DDT dust or a 3 % DDT-sulf ur 

 dust at the rate of 20-30 pounds per acre before the fruit sets. 

 An alternative procedure is to use an atomized oil spray con- 

 sisting of 1-2% DDT in kerosene or mineral seal oil. The 

 spray should be applied at the rate of 2-4 gal. per acre as 

 soon as the leaf hopper appears and before the fruit has set. 



ONIONS 

 Thrip Control 



Use either a 3 % DDT dust or a spray of DDT wettable 

 powder. Apply the dust at the rate of 45-50 pounds per 

 acre at the first sign of thrip damage, and repeat this treat- 

 ment at 1 4-day intervals as needed. Prepare the spray by 

 using 1 to 2 pounds of 50% DDT wettable powder per 100 

 gal. of water, and apply at the rate of 200 gal. per acre. 

 Make 2 or 3 applications at intervals of 10-14 days apart 

 after thrips appear. 



PEAS 

 Aphid Control 



Apply a 4 or 5 % DDT dust at the rate of 35-40 pounds 

 per acre when aphids begin to appear in numbers. 



