-155- 
Feeding was reduced when caterpillars were treated with more concen- 
trated dosages. 
Derris powder (2 lb. per 100 imp. gal.) gave poor control on apple 
trees in Nova Scotia. — Kelsall ( 232 ) in 1938, 
Argyrotaenia velutinana (Walk.), the red-banded leaf roller 
Hough ( 191 ) in 1927 reported that in an insectary Derrisol applied to 
the red-banded leaf roller with an atomizer at a strength of 1:800 did not 
give promising results. 
Garman ( 151 ) in 1936 reported the following results of tests against 
the red-banded leaf roller on apples in Connecticut: 
Treatment 
Apples 
Without 
external 
insect 
injury 
Marked by 
this species 
Conspicuous 
spray russet 
Lead arsenate (3 lb./lOO gal.) 
plus flotation sulfur 
Cryolite (4 lb./lOO gal.) 
plus flotation sulfur 
Cryolite plus Goposil 
Derris spray (4 lb./lOO gal., 
ground root, 4 percent rote- 
none, combined with skim-milk 
powder. One extra spray in 
August) 
Check— pink spray only 
Percent 
91.5 
65.4 
48.3 
32.0 
Percent 
0.1 
2.1 
4.3 
1.5 
Percent 
35.8 
24.4 
2.6 
1.3 
Haude, in advertising literature published by John Powell and Co., New 
York, N. Y. , in 1939 recommended' cube or derris dust (0.75 percent rotenone). 
Argyrotoxa semipurpurana (Kearf • ) 
Felt and Bromley ( 127 ) in 1938 reported comparative tests of derris 
(4 percent rotonono and 15 to 16 percent total ether extractives) at the 
rate of 4 pounds to 100 gallons plus rosin-rcsidue emulsion, 2 quarts to 
100 gallons, cryolite, and lead arsenate. In the case of the pin-oak 
leaf rollers, derris, apparently most effective as a contact spray, gave 
little control, most of the larvae being protected by the roll of the 
leaf. Cryolite gavo much better control, while lead arsenate gave com- 
plete protection. 
