18 IXSECTS AFFECTING VEGETABLE AXD TRUCK CEOPS. 
Phklippns color ad ensis Thorell, a spider, was found rarely, feed- 
ing on the smaller larva?. 
RECOMMENDATIONS FOR CONTROL, 
During 1911 the writer conducted several spraying experiments 
against the larva? with Paris green, arsenate of lead, and arsenite of 
zinc. It was found that the larva? of all sizes were readily killed 
with arsenicals. In fact this is one of the most easily controlled 
pests which occur on sugar beets in the Arkansas Valley. 
Paris green proved more quickly effective than other poisons tested, 
and the following formula is recommended: 
Paris green pounds 3 
Whale-oil soap do 6 
Water _ : gallons— 100 
This mixture should be applied to sugar beets with a field sprayer 
(Plate V) at the rate of from 75 to 100 gallons to the acre. It is 
necessary to wet only the surface of the leaves with spray. 
CONCLUSION. 
In the Arkansas Valley the striped beet caterpillar is a minor 
enemy of sugar beets. Ordinarily it is held in check by cultural 
methods and natural enemies. Occasionally, however, it develops in 
injurious numbers, and when this occurs the larva? can be easily con- 
trolled by spraying with Paris green. 
ADDITIONAL COPIES of this publication 
-£\- may be procured from the Superintend- 
ent of Documents, Government Printing 
Office, Washington, D. C, at 5 cents per copy 
