Appendix 169 



SHADE TREES 



{See trees) 



SUGAR BEETS CROWN FOR SEED 



Lygus Bug Control 



Apply a 5% DDT-sulfur dust at the rate of 30-40 

 pounds per acre, or a 10% DDT dust at the rate of 15-20 

 pounds per acre. 



TREES 



Shade Trees 



Apply a /4o % emulsion with a hand knapsack or pow- 

 er sprayer until the spray material begins to run from the 

 surfaces of the leaves. This will give excellent control 

 against defoliating insects, such as the gypsy moth, elm leaf 

 beetle, catalpa caterpillar, locust leaf miner, boxwood leaf 

 miner, canker worm, sawfly, evergreen bagworm, tent cater- 

 pillar, and many others. 



Forest Trees 



Defoliating insects on forest trees can be controlled in 

 the same manner as described above for shade trees, but this 

 method is satisfactory for only relatively small areas. For 

 large tracts of forest lands, the only practical method is to 

 spray the area from an airplane. 



The quantity of DDT required is usually from about 

 ■!4 to 1 pound per acre. Since fish are much more susceptible 

 to DDT poisoning than are warm-blooded animals, the 

 amount of DDT applied over areas containing fishing streams 

 should not exceed V4. pound per acre. 



