-9- 
exposure in the shade, lost some of its effectiveness.— Chapman and 
Lowry ( 111 ) • 
Phthorimaea sp. 
Sprays of Coposil (copper ammonium silicate), alone and with 5 
percent of rotenone concentrate, or Coposil plus commercial derris, 
gave significant reductions in infested tomatoes in Hawaii in 1937. 
—Hawaii Agricultural Experiment Station (270) . 
Sitotroga cerealella (Oliv.), the Angoumois grain moth 
In laboratory tests rotenone and derris resin were toxio to the 
eggs of this insect and at all stages of development.— Potter and 
Tattersfield (471). 
The pyrethrins at a concentration of 0.007 percent were much 
more toxic to the eggs than nicotine or nicotine sulfate at 0.07 per- 
cent or derris extract containing 0.001 percent of rotenone, when 
the eggs were in early incubation, but all these were highly effec- 
tive against older eggs .—Richardson ( 503 ) . 
Geometridae 
Alsophila pometaria (Harr.), the fall cankerworm 
In laboratory tests with sprays of derris, nicotine, and pyre- 
thrum (0.8 percent of pyrethrins), the last was the most effective, 
and the only one of the three that gave 100 percent mortality.- 
Balch (33). 
In comparative tests in Connecticut with lead arsenate, cryolite, 
and derris-rosin residue emulsion applied to large deciduous trees, 
rain washed off the cryolite and derris, but the arsenate stuck for 
several months. A good initial kill was obtained with all three ma- 
terials against the young cankerworms, but lead arsenate gave the most 
lasting protection.— Felt and Bromley ( 177 ) . 
Cheimatobia brumata (L.), the winter moth 
In Germany control was accomplished by spraying the moth eggs 
with preparations of dinitrocresol and nicotine, and the larvae with 
derris and pyrethrum preparations.— Thiem (589 ) . 
Hepialidae 
Oxycanus, probably cervinatus (Wlk.), subterranean grass caterpillar 
Sprays of arsenicals and derris were inefficient in New Zealand. 
