-37- 
regulated to give a deposit of 0.18 mg. of rotenone per 500 cm.^. 
DeBussy et al. ( 57 ) and also Van der Laan ( 244 ) in 1936 reported 
that this species is sensitive to derris dust. 
Klinger ( 217 ) in 1936 reported that rotenone spray or dust gave 
no mortality of fourth instars in 8 days. Derris dust killed 10 
percent in 6 days. 
Fotts ( 331 ) in 1936 reported that nine 10 acre plots were sprayed 
in t i-, o serie? by an autogiro at Assonet, Mass. The lead arsenate and 
calcium arsenate spray c ntained, by "-eight, 1 part of arsenical, 0.4. 
part of fish oil, and 2.1 parts of water. In the derris spray the 
ratio of derris to water by weight was 1:6. Excellent adherence, fairly 
good distribution, and fairly good control was indicate: 1 . Effective 
control was obtained in both the e?rly and lat--r series of half-acre 
plots with a spr e y containing 3 pounds of derris er 100 gallons of 
ws.te and 0.5 percent of fish oil. 
Van Gundia ( 452 ) in 1936 reported control of the gypsy moth, 
and many other le^ ; f-eating insects, with rotenone dust. The formula 
used carrie'.' approximately 30 percent of sulfur in the arm of r used 
bentonite sulfur, which aids as a sticker for the rotenone, and also 
acts as an activator. 
The Massachusetts Agricultural Experiment Station (270) in 1937 
reported that the nearly full-grown caterpillars of tl is species were 
treated with derris sprays with results as follows: 4 pounds of 
derris powder (4 percent rotenone) and 4 pounds of fish-oil soap in 
100 gallons of water to an acre killed only 40 percent; 6 pounds of 
derris powder (4 percent rotenone) • n: 1 4 pounds of fish-oil soap in 
100 gallons of water, 400 gallons to the acre, killed only 75 percent. 
Potts ( 333 ) in 19^7, reporting on tests at New haven, Conn., stat- 
ed that this insect can be controlled by a spray containing from 5 to 
8 pounds of derris (4 percent rotenone) per 100 gallons of water. 
"Then from 0.5 to 1.0 gallon of fish oil or linseed oil per 100 gallons 
of spray mixture is ad t p riod of effectiveness of th lerris 
0- tly prolonged and its adherence increased. 
Fransen ( 141 ) in 1939 reported that 32 times a much rot 
necessary to kill 1 rv. 2.5 cm. lon<* as to kill hrr, 0.35 cm. long, 
but only 8 times as much to kill stil] le ; r I rv \ Lcl r 
to pupate. 
Pseudodura daaychiroidos Strand 
Stilpnotia cygna ("'oor. ) 
Sonan ( 378 ) in 1927 re] * that s] derris "a so; 
proved very effective - t these insects inf ; t< a plants in 
Formosa. 
Stilpnotia salicis (L.) th satin moth 
Trappmann and Nitsche ( 417 ) in 1935 r | I that rot none sprays 
