This paper records the recovery of 130 marked apple maggot (Rhagoletis pomonella Walsh) flies out of a total of 3,152 which were released in one site. These marked flies were recovered at distances varying from 65 to 233 yards from the point of release. Although released in unsprayed trees bearing many apples, the marked flies soon left them as they did unsprayed non-bearing trees in similar experiments in 1931. Marked flies released in young sprayed apple trees were not recovered
Document Type: Research Article
Publication date: April 1, 1933
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