-12- 
for technical ressons it wps necessary to use 30 pounds «»t 0.117 per- 
cent of rotenone content. — Frw.sen N . 
Forthetria dispar (L.), the "ypsy moth 
Unfavorable results were obtained with derris released from an 
autogiro on woodlands* Derris extract mixtures were applied with oil 
in proportions that were 9 to 12 times as concentrated, in toxic in- 
gredients, as powdered derris root, — Potts ( 472 , 473) • 
In Massachusetts dusting with derris, or mixtures of derris and 
pyrethrum failed to control the larger caterpillars. A spray contain- 
ing 15 pounds of derris (4 percent of rotenone) and 2 pounds of soap 
per 100 gallons of water, applied at 400 gallons per acre, was as ef- 
fective as pyrethrum dusts against maturing larvae, and was much cheap- 
er.— Franklin ( 193 , 19 5 ) . 
Stilpnoti salici (L.) , the satin moth 
Full-fed larvae in Holland were very resistant to rotenone but 
not to pyrethrum. It would be necessary to apply 45 pounds per acre 
of powder containing 16 percent of rotenone.— Fransen (198). 
Nymphalidae 
Pareva vesta F. ( "Acraea issoria Hbn.), the China-grass butterfly 
Aqueous extracts of the seeds of l/illettia pachycarpa were ef- 
fective against the larvae of this insect in China.— Chiu and coworkers 
(114). 
Vanessa cardui (L.), the painted lady 
The two dinitrocycloalk/lphenols tested were more toxic than acid 
lead arsenate to the larvae, and the two nitrated phenols were more 
toxic than rotenone. — Kagy ( -333 ) . 
The median lethal dose of re- i. ir ».03 mg. per gram of body 
weight.— Cutkomp ( 132 ) • 
Olethreutidae 
Ancylis comptana fragariae (Walsh & Riley), the strawberry leaf roller 
Dusts were more effective thar somy? in ''issouri. Four dusts 
were recommended, one being derris (5 percent of rotenone) mixed with 
