-60- 
residue emulsion, and 100 gallons of water, was sixth in value. In 
1941, 18 spray mixtures were tested. Lead arsenate with an appropri- 
ate sticker was the best spray material used, Derris or rotenone 
dust with a good sticker was the most efficient of the non-poisonous 
materials tested*— Langford and coworkers (353 , 354) , 
A spray of 6 pounds of ground derris root (4 percent of rotenone) 
and 1 quart of rosin residue emulsion per 100 gallons of water gave 
protection to ornamental trees and shrubs in Connecticut, provided 
the plants were treated every 5 or 6 days*-- Johnson (329). 
Lead arsenate gave better control of the Japanese beetle and 
retained' its effectiveness longer than did rotenone, — McKenna and 
Hart z ell (584). 
Derris, mixed with soil in which beetle larvae were confined in 
earthen pots, was so slightly toxic as to be of little practical 
value. The slight insecticidal value of derris was destroyed by 
adding lime to the soil,— Fleming (188). 
To control the adult beetles the use of various sprays, includ- 
ing lead arsenate and ro ten one-bearing materials, is recommended, — 
U, S, Bureau of Entomology and Plant Quarantine ( 625 , p, 769). 
Derris powder (4 percent of rotenone) with a spreader-sticker, 
sprayed on elms and other plants, afforded temporary relief from in- 
tensive Japanese beetle feeding, but bordeaux mixture with lead arse- 
nate was the best of several sprays used,— Collins and Nardy ( 117 ) . 
Dusts and sprays containing derris or cube powder and their ac- 
tive principles are repellent to the Japanese beetle,— Hamilton (253 , 
p. 11). 
One of the more important uses of rotenone is to control the 
Japanese beetle.— Howard and coworkers (294 , p. 31), 
Rotenone is effective, but nicotine is ineffective against this 
fruit pest,— Mclndoo (383 ), 
Rotenone was recommended against this beetle on many plants in 
victory gardens.— White and Doolittle (683 , p. 22), 
For use against the Japanese beetle the substitute for rotenone 
is lead arsenate,— U, S, Department of Agriculture (633, p. 14). 
