. Elementary entomology . FIG. 188. Peach twigs infested with San Jose scale. (Much enlarged) At left, large mature female and small young scales are clustered in a groove of the twig. At right is shown a large female scale with the scale proper raised, showing the insect beneath. (After Britton) shell), which is common on apple and several shade trees ; the San Jose scale, possibly the most serious pest of fruit trees; the rose scale, common on roses, raspberries, and blackberry canes; and the various flat scales found on palms and other greenhouse and house plants.

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