. Manual of fruit insects. o, Pennsylvania, Del-aware and south-ward. In 1895 wereared in New Yorktwo generations ofthe scurfy scale andone generation onlyof the oyster-shellscale from eggswhich hatched May13 on trees in an in-sectary, and foundcorroborative evi-dence on trees inthe field, but thiswas doubtless an exceptional season. The minute, purplishyoung which hatched May 13, molted first early in June, andthe females the second time about a week later. By the middleof June the males had emerged and by July 9 many of the eggswere laid, and these hatched in about ten days. On August 22,a m
. Manual of fruit insects. o, Pennsylvania, Del-aware and south-ward. In 1895 wereared in New Yorktwo generations ofthe scurfy scale andone generation onlyof the oyster-shellscale from eggswhich hatched May13 on trees in an in-sectary, and foundcorroborative evi-dence on trees inthe field, but thiswas doubtless an exceptional season. The minute, purplishyoung which hatched May 13, molted first early in June, andthe females the second time about a week later. By the middleof June the males had emerged and by July 9 many of the eggswere laid, and these hatched in about ten days. On August 22,a mature male and female in the same stage as those on the treein the insectary, were seen in the field, and eggs were laid duringthe first three weeks in September. Owing to the purplishbodies of the young and half-grown scurfy scales and thethinness of the scale, they are not nearly so conspicuous on thebark as the oyster-shell species. The number of purplish-redeggs laid by the females varies from 10 to 85, averaging about. Fig. 176. — Apple infested with scurfy scale. APPLE INSECTS 179 50, and these hibernate with the dead and shriveled bodies ofthe mothers under the scales. The scurfy scale apparently has fewer enemies than theoyster-shell scale, as but a single parasite, Ablerus cUsiocampoe,is recorded. Two ladybird beetles, the twice-stabbed lady-bird and a species of Hyperaspidius, however, devour manyof them. Remedial treatments. The remedial measures recommended for the oyster-shellscale will also control the scurfy scale. Putnams ScaleAspidiotus ancylus Putnam This native American scale insect is common and widelydistributed, but is rarely injurious except upon plum trees andcurrant bushes, which are sometimesincrusted as badly as with the muchmore dangerous and destructive SanJose scale. Apple, pear, peach, nec-tarine, cherry and orange trees, be-sides several shade trees, are alsoamong its food-plants. The mature,dark gray or blackish, nearly circular female scale (
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