-7- 
Hamilton ( 180 ) in 1938 reported that on walnut trees the larvae 
were satisfactorily controlled by derris or cube powder spray (0.02 
percent rotenone) plus rosin-residue emulsion (4- pounds per hundred 
gallons) as a sticker. The spray acts as a contact poison, the 
effective period being 6 days. There was 100 percent kill of 
larvae in sprayed webs. 
According to the Ne?: Jersey Agricultural Experiment Station 
(294) in 1938, derris or c ube powder in water to which rosin- 
residue emulsion had been added was effective. 
! A T . J. Haude in March 1939, in advertising literature published 
by John Powell and Co. New York, $. Y. , recommended a cube or derris 
spray (4. pounds of powder containing 4- percent rotenor.e per 100 
gallons plus 4 pounds rosin residue emulsion) against this insect 
on walnut. 
In cage tests Bonrote (a rotenone spray made by the Bonide 
Chemical Company) at 10 pounds per 100 gallons gave 67.7 percent 
kill of two-thirds-grown exposed caterpillars at the end of 13 days.- 
Felt and Bromley ( 128 ) in 1940. 
Isia spp. 
Agicide DC-4. (rotenone 0.6 percent at the rate of 4 pounds 
per 100 gallons of water (O.003 percent rotenone in spray) killed 
from 50 to 100 percent of brown woolly-bear caterpillars within 
96 hours. — Agicide Laboratories (8_) in 1939. 
Utetheisa lotrix (Cramer) 
U. pulchella (L.) 
Dusting with derris mixtures containing 0.5 to 1.0 percent 
of rotenone failed to give more than 30 to 50 percent control of the 
larvae in the laboratory. About 50 percent of the caterpillars 
of _U. lotrix survived after being dusted in the field with derris 
dust containing 2 percent of rotenone.— Van der Vecht (4 r 4) in 
1936. ^~* 
Blastobasid~e 
Holcocera iceryaeella (Riley) 
See Basinger and Boyce (24) under Argyrotaenia citrana 
(Fern.), on page 154. 
Bombycidae 
Bombyy mori (L.) the silkworm • 
Silkworms were used as test insects by Fryer et al, ( 149 ) 
in 1923 in evaluting derris extracts. 
