. Cooperative economic insect report. Beneficial insects; Insect pests. - 782 ~ tree and appears normal until the maggots are nearly full grown, at which time sunken spots appear on the fruit accompanied by some fruit drop. After feeding for 8 to 14 days, the full-grown maggot leaves the fruit and enters the soil to pupate. Only one generation is produced per year. Description: EGG - Yellowish, with a slight pedicle at one end; average size mm. long and mm. wide. LARVAE - Full-grown maggots vary in size aver- aging mm. long and 2 mm. wide. The third instars of the eastern and weste
. Cooperative economic insect report. Beneficial insects; Insect pests. - 782 ~ tree and appears normal until the maggots are nearly full grown, at which time sunken spots appear on the fruit accompanied by some fruit drop. After feeding for 8 to 14 days, the full-grown maggot leaves the fruit and enters the soil to pupate. Only one generation is produced per year. Description: EGG - Yellowish, with a slight pedicle at one end; average size mm. long and mm. wide. LARVAE - Full-grown maggots vary in size aver- aging mm. long and 2 mm. wide. The third instars of the eastern and western subspecies may be distinguished from each other by the number and arrangement of beads on the anterior spiracles. Subspecies cingulata has 21 to 31 beads on each anterior spiracle, arranged in 2 rows. Subspecies indifferens has 7 to 19 beads on each anterior spiracle, arranged in one row or with only a partial second row. ADULTS - About two-thirds the size of a house fly, wings hyaline with transverse, fuscous-brown bands. On the subspecies cingulata, the distal portion of the wing typically has a separate spot over the third vein (R4+5). On the subspecies indifferens, this spot is typically joined to the transverse markings, forming a forked terminus. Rarely, these characters may be found reversed for the two subspecies. Whitebanding of the abdomen is usually more pronounced in the eastern subspecies. (Prepared in Survey and Detection Operations in cooperation with other ARS agencies). CEIR 12(28) Figures E-1 (typical), E-2 (atypical), wings of eastern flies Figures E-3, E-4, thoracic spiracles on eastern maggots Figures W-1 (typical), W-2 (atypical), wings of western flies Figures W-3, W-4, W-5, thoracic spiracles on western maggots Major references: 1. Blanc, F. L. and Keifer, H. H. 1955. The Cherry Fruit Fly in North America. Calif. Dept. Agr. Bui. 44(2):77-88, 2. Cox, J. A. 1952. The Cherry Fruit Fly in Erie County. Penn„ Agr. Exp. Sta. Bui. 548, 17 pp. 3. K
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