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The imported currant worm, Pteronidea ri"be.-.ii Scopoli, is 
also readily controlled with rotenone sprays and dusts. As i i- 
festations of this insect in a given planting are often localized, 
"spot" spraying or dusting nay be practiced to advantage. 
All of the pests of currant for which arsenic /.Is have previously 
"been used may now be controlled by rotencne sprays or dusts on the 
use of which there are no legal restrictions. 
Field tests of pondered derris, cube, and timbo root of 
comparable analytical quality showed that such powders were about 
equal in effectiveness when used for the control cf the imported 
cabbage worm. With this insect, dusts of 0.5 percent rotenone content 
gave optinran result?, and those of 0.3b percent rotenone content gave 
results that were comr.end.ably satisfactory considering costs. Spray 
mixtures containing 4 pounds of good grade powdered root in 100 gallons 
of water with a sticker gave fair results, the degree of control 
effected not being equal to that attained b- the use of dusts. In- 
festations of thrips and aphids in the cauliflower seed-bed daring ■ 
July were effectively controlled by treatment with rot 211 one-containing 
dusts of 0.5 and 0.33 percent rotenone content, the applications being 
made late in the evening under calm conditions in anticipation of a 
more or less extended period 01 high relative humidity during the 
night. 
Comparative tests were made of darris, cube, and timto powder- 
having about the sa.me content in active ingredients in spray and 
dust mixtures for the control of the Mexican bean beetle, Ep ilachna 
corrupt a ( varivesti s) Muls. The results showed that all three 
powders when used at comparable strengths in terns of active 
ingredients were effective, a slight superiority favoring derris. 
Spray mixtures containing 2 to 3 pounds of good grade powdered root 
in 100 gallons of water with sticker gave satisfactory results. 
Sprays during the current season were more beneficial to plant growth 
tnan dusts. Of the dust mixtures tested those of 0.5 and 0.75 percent 
rotenone content gave the best results. It is interesting to note 
that the yield of snap beans from plants effectively sprayed or dusted 
did not invariably result in marked increases in yield of pods. From 
such evidence it seemed highly probable that to formulate a rational 
method of control for the Mexican bean beetle emphasis should be 
placed more on the making of a few opportune number of applications 
and less on the necessity for the fulfilment of a definite series of 
applications according to schedule. 
Beard (24) in 1937 reported tests of insecticides against the 
striped cucumber beetle in Connecticut. Potted squash plants were 
used for food material, and were covered, by copper wire screen cages. 
Beetles were introduced into the cages, and the insecticides were 
applied through the wire 'screen. Five insecticides were tried, as 
follows: 
