. -i5o- 
Haude in 1939 » i n advertising literature published "by the John Powell 
Co., Hew York, N. Y. , recommended a dust containing 0.5 percent of rotenone 
at the rate of 20 to 25 pounds per acre, applying it when the worms are 
young and repeating every 7 to 10 days. For severe infestation, the New 
York State Experiment Station recommended a 0.75- or 1.0-percent -rotenone 
dust. A ,5-percent-rotenone dust was recommended to control young 
tomato hornworms on eggplant. 
Protoparce sexta (Johan.), the tobacco hornworm 
See Gunderson (I7j0 and Haude under Protooarce quinquemaculata (Haw.). 
Campbell (60) in 193^ critically reviewed the work of Chamberlin, 
who tried rotenone against this species on tobacco. The preparation con- 
tained 0.5 percent of rotenone in an inert carrier. The effectiveness 
of a 1-percent suspension of this preparation was compared with that of 
a 1-percent suspension of lead arsenate, each applied as a spray on grow- 
ing tobacco plants. The third and fourth instars were allowed to feed 
on the sprayed plants until they died, or until the end of 5 days. Lead 
arsenate killed all the larvae in the first 2U hours. The rotenone prepa- 
ration killed only 26 percent of the larvae in 5 days. Similar results 
were obtained when the rotenone preparation was used as a dust at 3 to 9 
pounds per acre. The failure of rotenone to cause a greater mortality 
may have been due, not only to decomposition and weathering, but to the 
small quantity of rotenone applied per unit area of leaf surface. 
At the 193^ meeting of the American Association of Economic Ento- 
mologists, as reported by the United States Department of Agriculture, 
Bureau of Entomology and Plant Quarantine ( U37 ) Cory led a discussion of 
field results with arsenical substitutes for the control of vegetable 
insects. Headlee of New Jersey stated that derris dust had given excel- 
lent control of this hornworm. This statement was published by Headlee 
( 186 ) in 1935. 
The Alabama Polytechnic Institute (10) in 1935 reported that derris 
dust was effective in control. 
Protoparce spp . 
Cube exerts only a very limited control of the tobacco hornworms, 
Protoparce sop. — Chamberlin and Madden (6j) in 1937. 
Parks and Pierstorff ( 32U ) in 193& recommended rotenone spray to 
control hornworms on tomato. 
