Nicotine Dust for Truck-Crop Insects. 19° 
such as high-priced market peas or sweet peas, and will probably 
prove too expensive for cannery or low-priced market peas. 
Fic. 9.—One-horse duster in use against pea aphis. 
THE ONION THRIPS.‘ 
The onion thrips, also an insect of wide distribution, is the cause 
of enormous damage to onions practically wherever the latter are 
Fic. 10.—Power-operated duster with single discharge pipe, used in field of sweet 
peas when plants are too large to permit driving down the rows. 
grown. It is also very destructive to cauliflower, cabbage, cucum- 
ber, and melons, and various other vegetables. Spraying is efficient 
in controlling it from the standpoint of the percentage killed, but 
7Thrips tabaci Lind. 
