[Fruit culture] . character-istic appearance of a part of an apple limb infested by thisinsect is illustrated in Fig. 14 (a), and a single female, with asection of the scale removed to show the eggs, is sho^vn enlargedin (b). The scales that cover the female insects are darkbrown or grayish in color, about | inch in length, and shaped 30 APPLE PESTS AND INJURIES 6 somewhat like an oyster shell. The scales of the male insectare much smaller than those of the female. In the latter part of August the female insects lay fromforty to one hundred small, reddish eggs; these remain overwinter under th
[Fruit culture] . character-istic appearance of a part of an apple limb infested by thisinsect is illustrated in Fig. 14 (a), and a single female, with asection of the scale removed to show the eggs, is sho^vn enlargedin (b). The scales that cover the female insects are darkbrown or grayish in color, about | inch in length, and shaped 30 APPLE PESTS AND INJURIES 6 somewhat like an oyster shell. The scales of the male insectare much smaller than those of the female. In the latter part of August the female insects lay fromforty to one hundred small, reddish eggs; these remain overwinter under the scale, and during the latter part of May hatchinto small lice-like insects, which crawl out from under the scaleand move slowly over the bark for a few hours, when theyattach themselves to the bark and remain there for the restof their lives. In the first molting, the insects lose their eyes,legs, and antennae, and immediately begin secreting the mate-rial of which the scale is formed. The females die soon after. Fig. 15 laying their eggs, and, as there is only one brood in most partsof the United States, the oyster-shell scale does not multiplyanything like so rapidly as the San Jose scale. As is the casewith the San Jose scale, the oyster-shell scale insects may becarried from tree to tree during the period that they arecrawling, by birds or by the wind. Although the oyster-shell scale is very widely distributedthroughout the United States, it does not often occur in suf-ficiently large numbers to do great injury to orchards. How-ever, if orchards are neglected, oyster-shell scale may becomesomewhat serious. § 6 APPLE PESTS AND INJURIES 31 The same methods of control are recommended for theoyster-shell scale as for the San Jose scale, and if spraying ispracticed for the destruction of San Jose scale little need bedone for the oyster-shell scale. 28. Scurfy Scale.—Scurfy scale are illustrated in naturalsize in Fig. 15 (a). The larger scales are the females and thesmaller
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Keywords: ., bookcentury1900, bookdecad, booksubjectfruitculture, bookyear1912
