. Manual of fruit insects. spider: raspberry, p. scale : currant, p. borer : grape, p. snout-beetle : sirawberry, p. 371. CHAPTER IX CHERRY INSECTS The insects of the greatest commercial importance to thecherry grower are the plum curculio (p. 243), the cherry fruitflies, the cherry aphis, the pear slug (p. 214) and on the sweetcherries the San Jose scale. Cherry trees are also subject tothe attack of the fruit-tree bark-beetle (p. 277). The Cherry Fruit-fliesRhagoletis dngulata Loew and R. fausta Osten Sacken Most wormy cherries in the United States an
. Manual of fruit insects. spider: raspberry, p. scale : currant, p. borer : grape, p. snout-beetle : sirawberry, p. 371. CHAPTER IX CHERRY INSECTS The insects of the greatest commercial importance to thecherry grower are the plum curculio (p. 243), the cherry fruitflies, the cherry aphis, the pear slug (p. 214) and on the sweetcherries the San Jose scale. Cherry trees are also subject tothe attack of the fruit-tree bark-beetle (p. 277). The Cherry Fruit-fliesRhagoletis dngulata Loew and R. fausta Osten Sacken Most wormy cherries in the United States and Canada arecaused by the grub of the plum curculio (p. 243), but through-out the northernUnited States andCanada there occurtwo closely relatedspecies of fruit-flieswhose maggotssometimes infestfrom one fourth totwo thirds of theripening fruits. Un-fortunately, thereis little externalT^ , , ., • u f * evidence of the 258. — Dorsal and side view of the eherry fruit-fly maggot, 72. cin^utoo (x 7|). work of these304. Fig, CHERRY INSECTS 305 fruit-flies in cherries at picking time, and often the fairest-looking fruits contain the maggots which the housewife maydiscover at canningtime, or in the bot-tom of a dish ofluscious cherriesleft over from aprevious species which first attracted atten- -^^^^ ^^ — Cherries infested with fruit-fly maggots. tion by its ravages was R. cingulata. The full-grown lightyellowish-white maggot of this species is about I of an inchin length and scarcely distinguishable from the apple maggot(Fig. 258). There is but a single generation of this cherry fruit-fly annually, the maggots\ working in the cherries mostly during June, but some may be
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