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Trypetidae 
Rhagoletis cerasl (L.), the cherry fruitfly 
Field experiments carried out in Switzerland in 1943, showed that 
it i6 possible by correct, biologically based spraying of cherry trees 
with 1 percent of Gesarol to combat this insect successfully even in 
highly infested areas. The spraying of the cherry trees should begin 
during the first days of June. A seoond treatment applied 14 to 16 
days after the first will last until harvest. No separate treatment 
of the ground is neoessary.— - Wiesmann and Fenjves (575) . 
Rhagoletis cingulata (Loew), the cherry fruitfly 
Rhagoletis fausta (O.S.), the blaok cherry fruitfly 
Results obtained with DDT against the cherry fruitfly were promis- 
ing enough to warrant further tests.— Baker and Porter (81). 
Results of tests with DDT in Oregon in 1944 for the oontrol of the 
cherry fruitfly were far from favorable.— Childs (110 ) . 
Dusts containing 2 or 3 percent of DDT with sulfur, talc, and 
diatomaceous earth at 40 pounds per acre failed to give satisfactory 
control of the cherry fruitfly.— Childs and Robinson (ill) . 
In the laboratory the action of several DDT preparations on flies 
was slow, although some of the flies showed typical DDT symptoms within 
an hour after they were put in the cages. It required 80 or more hours 
to kill 50 percent of them. Two field plots reoeived one application 
of 2 percent and 3 percent dust respectively, combined with 50 percent 
sulfur and talc. One application of these dusts at 40 pounds per acre 
was not effective.— Jones (230 , 232 ). 
Rhagoletis pomonella (Walsh), the apple maggot, the blueberry maggot 
Results obtained with DDT were promising enough to warrant further 
tests.— Baker and Porter (81). 
Four applications of emulsive summer oil containing DDT, used to 
give about 2 ounoes of DDT per 100 gallons of spray, and timed to cover 
the period of first-brood attack, gave a considerable degree of oontrol 
and a long lasting residual effect against second-brood infestation.— 
Cleveland (114). 
In test6 made in New Hamphsire apple orchards during 1944 Gesarol 
AK-20 spray was superior to lead arsenate.— Conklin (116 ) • 
