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When nonarsenical sprays are used on sweet cherries, use derris 
or cube powder (4 to 6 percent of rotenone) 2 pounds, wettable sul- 
fur (at manufacturer's directions), and water to make 100 gallons. 
Three applications are required.— Mills and Evans (419 , p.23). 
The most effective chemicals tested were rotenone, calcium 
antimony tartrate, and basic oopper arsenate in spray form. The best 
contact dusts were 4,6-dinitro-o-cyclohexylphenol and rotenone. Com- 
mercial rot en one-bearing roots were more effective as a oontact spray 
than as a contact dust* The effectiveness of rotenone-molasses spray 
was decreased by the addition of a spreader*— Rosensti el (516). 
One of the more important uses of rot anon e-containing roots is 
to oontrol the cherry fruit fly .—Howard and ooworkers (294, p. 30) 
Rotenone is effeotive against cherry fruitfliesj niootine is 
Ineffective. — Mclndoo (383 ) . 
Rhagoletls oompleta Cress., & walnut husk fly 
Derris or cube dust (l per o ant of rotenone) was very effeotive 
under laboratory conditions, but under field conditions three treat- 
ments at 15-day intervals were unsatisfactory. A mixture of cryo- 
lite and derris or cube was not measurably better than cryolite a- 
lone.— Boyoe and Bartlett (79 ) • 
Rhogoletls fausta (O.S.), the black cherry fruitfly 
See information on R. cingulata 
Rhagoletls pomonella (Walsh), the apple maggot, blueberry maggot 
Host of the papers on this species deal with it on apple trees 
where it is called the apple maggot. In the following three ab- 
stracts it is called the blueberry maggot for it was treated on blue- 
berries. 
Experiments on the control of this pest on blueberries were con- 
ducted in 1939 with dusts of caloium arsenate, and a mixture of derris 
and pulverised olay containing 2 peroent of rotenone. Counts at pick- 
ing time on the 10-aore plots showed 7 larvae per 20 ounoes of berries 
for the arsenate and 17 for the derris mixture although the plants 
treated with the latter retained the foliage more completely. In 1940 
studies were designed to test the value of an application of the derris 
mixture following two applications of calcium arsenate, since a third 
