-156- 
Hamilton ( 180 ) in- 1938 reported .that oak leaf rollers on pin oak 
trees were controlled satisfactorily (50- to 100-pe'r'cent kill) in one 
test out of three by cube or derris spray (4 lb..,.pov/der of 4-percent ro- 
tenone content plus, 4 lb. rosin-residue emulsion per 100 gal. water). 
The spray acts as a contact poison. The effective period- -was 3 to 4 
days. 
Cacoecia podana (Scop,) 
The East Hailing Research Station Kent j England ( 106 ), in 1935 stated 
that tests of derris dusts and sprays against the apple surface-eating 
fruit tortricid showed sufficient promise to justify further trials. 
F. J. D. Thomas ( 409 ) of that station, reported in 1935 on the control of 
apple surface-eating tortricid larvae with derris dust and derris spray. 
The object of the dusting trial was to apply a protective dust- to the fruit 
before tortrix attack began. Moths, both codling and Cacoecia podana , 
were beaten from the trees available for this trial during the latter part 
of June. On July 17 two dusts were applied, one of derris and the- other 
of barium fluosilicate. Subsequent observations and counts on both wind- 
falls and crop showed very little tortrix damage to the fruit on any of 
the trees, including the undusted controls. Derris (crude rotenone, 3,63 
percent), 2 pounds, plus soft soap 5 pounds per 100 imperial gallons, re- 
duced the damage 50 percent when applied approximately 9 weeks after 
petal fall. 
Cacoecia pronubana (Hbn. ) 
Miles and Miles ( 278 ) in 1935 discussed the use of derris for combat- 
ing greenhouse pests. For control of the carnation tortrix moth, spraying 
with lead arsenate and nicotine washes and tho more recently introduced 
derris and pyrethrum sprays is most likely to give satisfactory results 
when carried out before the larvae spin themselves up in their feeding 
shelters. 
This pest on carnations was killed by a product containing 12 percent 
of powdered Lonchocarpus nicou roct (6 percent rotenono) and 88 percent of 
talcum, according to Etablissements Rotenia in a letter to R. C. Roark in 
1938. 
The Experimental and Research Station of the Nursery and Market Gar- 
den Industries 1 Development Society Ltd., of Cheshunt, England ( 113 ), in 
1939 stated that a concentrated derris insecticide failed to control cat- 
erpillars of the carnation tortrix moth on cyclamen. 
For the control of the carnation tortrix moth, poison sprays such ai 
lead arsenate, nicotine, derris, and pyrethrum are effective in killing 
the caterpillars before they become enclosed in their protective webs. 
The foliage of the plants should be thoroughly wetted above and below, and 
the spray should penetrate the flowers and loaves at the ends of the 
shoots. — Cameron (59) in 1939. 
