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prevented their 'being effective. Dry dust gave good results in the 
laboratory. 
According to a letter from 'Ftablisseraents Rotenia in 1938, to R. C. 
Roark, this pest on cherry trees was mitigated "by a product containing 
12 percent of powdered Lonchocerous nicou root ( 6 percent rotenone) 
and 88 percent of talcum. 
Rhagoletis cingalata (Loew), the cherry fruitfly; the cherry maggot 
The Ke" York Agricultural Experiment Station ( 214 ) in 1935 stated 
that derris plus an adhesive, such as gum arabic, applied as a spray' 
reduced the number of cherry fruitflies appreciably. 
Glasgow ( ll5 ) in 1935 reported trials of substitutes for lead arse- 
nate in control. 
Three applications of derris powder ( 4 percent rotenone) , ^hen 
applied at a rate of 2 pounds to 100 gallons, reduced the fly infestation 
in one large sour-cherry orchard from approximately 30 percent in 193? to 
less than 1 percent in 1934. • 
' The Ne~ York State Agricultural Experiment Station ( 215 ) in 1937 
reported that derris was being tested for control of the cherry maggot. 
The same station ( 217 )' in 1939 reported that tests on the use of rotenone 
sprays indicated that they are efficient substitutes for arsenicals on 
cherries to be sold as fresh fruit. 
Hamilton end Pearce (134) in 1938 reported that preliminary experiments 
^ere carried out in Ne^ York in 1937 on the relation between programs 
for spraying ^ith arsenicals and the residue on cherries at harvest time. 
Sprays of cube root (5.3 percent rotenone), flotation- sulfur paste, and 
soybean flour (2.5, 6.0, and 0.5 pounds p^r 100 gallons of spray), applied 
on June 5, 15, and 24 following a shuck-fall spray of lead arsenate ( 1 
lb.), were tested on trees that had a.l5-percent infestation by Rhagoletis 
cingulata and R. fausta 0. S. during the previous season. Of over 10,000 
cherries from 2 trees, only 0.35 percent ^ere injured by Rhagoletis , but 
the lightness of infestation during- the preceding year precludes definite 
conclusions. 
The New York c ounty Agents' Training School ( 213 ) held at Ithaca on 
December 19, 1938, heard reports that cherry fruitfly control tests con- 
ducted in ' plantings kno^^n to have been infested in 1937 -rrave the following 
results in 1938: 
