INSECTS AND OTHER ANIMAL Pests InsuRIOUS To FimrLtpD BEANS 1009 
and pupal stages are little known, but the larvae probably feed on the 
roots of ragweed, beggar-ticks, and other weeds, pupating sometime in 
June. 
CONTROL 
It has been pointed out that clean cultivation is an important factor in 
the control of Systena taeniata, and this is equally true for S. frontalis. 
The removal of ragweed, lamb’s-quarters, and beggar-ticks from a field 
Fig 95. SPRAYING MACHINE USED IN EXPERIMENTS FOR THE CON- 
TROL OF FLEA BEETLES ON BEANS © 
after the eggs have been deposited in the fall and again before they hatch 
in the spring, should destroy many of the pests. Many of the insects 
breed along the edges of fields and in overgrown fence corners, and there- 
fore keeping the weeds cleaned up in these places is a great help in reducing 
the number of beetles that may emerge. 
In the summer of 1919, red-headed flea beetles were numerous in a bean 
field just across the road from the Perry laboratory, and control experi- 
ments were conducted there. On July 18, bean plants were sprayed with 
arsenate of lead (3 pounds of paste to 50 gallons of water), and twenty-five 
beetles were placed in a cage over these plants. The same number of 
