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in August on plots where fruitworas were abundant and killed fully one- 
third of the worms in the berries. In 1938 this station ( 271 ) reported that 
a spray consisting of pounds of derris powder (4 percent roter.one) and 
2 pounds of soap in 100 gallons of water, applied at the rate of 400 gal- 
lons per acre on July 10 and again on July 20, controlled this insect 
almost completely on a bog where the worms took 40 percent of the crop on 
untreated check areas. Ten pounds of cube powder (4 percent rotenone) and 
2 pounds of soap in 100 gallons of water, applied at the rate of 400 gal- 
lons per acre, also gave good control. Goulac, Ultrawet, calcium casein- 
ate, SS-3, Ortho liquid spreader, coconut-oil soap, and resin fish-oil 
soap were tried as spreaders for the derris and cube sprays, and the soaps 
gave the best results. With either derris or cube powder, two sprays seem 
to be advisable for control of the fruitworm, one to be applied when about 
three-fourths of the bloom is past, the other about 10 days later. Small 
sample lots of the berries should be examined before a bog is sprayed, to 
determine the abundance and condition of the f ruitworm eggs present. In 
1939 this station ( 272 ) reported that 7 pounds of derris powder (4 percent 
rotenone) and 2 pounds of soap in 100 gallons of water gave as good con- 
trol as sprays containing more derris. Two applications at the rate of 
400 gallons an acre were necessary, one when about a third of the bloom 
was past and the other 10 days later. Cube dusts, used when rotenone-bear- 
ing sprays are most effective, killed the worms fully as well as did the 
sprays. One dust containing 2 percent of rotenone and an activator con- 
trolled the f ruitworm almost completely and such a dust may prove to be a 
satisfactory control. The rotenone-bearing sprays killed most of the worms 
as they were entering their first berry near the stem end. 
• . The dusts killed most of them while they were hatching from the 
egg or soon after they hatched and before they left the cup formed by tho 
calyx lobes of the 'berry. 
The Massachusetts Agricultural College in an Extension Service chart 
in 1957 recommended derris powder (4 percent rotenone), 10 pounds plus 
soap 2 pounds in 100 gallons of water, at tho rate of 400 gallons per 
acre, for combating tho fruitworm on cranberries. The first applicction 
should bo made soon after the vines go out of bloom and a second spr 
10 days later. Derris spray should not bo used near a ditch or stream 
because it hills fish. 
Haudc in advertising literature published by John Powell and Co., 
New York, N, Y. , in 1939 reported that in Massachusetts a spray of 8 
pounds of cube or derris powder (4 percent rotenone) and 2 pounds of soap 
in 100 gallons of water, at 400 gallons per acre, applied on July 10 and 
20, gave control of this insect. Soap gave the best results of the commer- 
cial spreaders used, 
Flodia interpunctella (Hbn, ), the Indian meal moth 
Craufurd-Benson (85) in 1938 reported that the larva was not suscep- 
tible to a derris insecTicide v/hen dipped I 
