. Circular. Insect pests; Insect pests. Fig. 2.—San Jose tjcale. Applo brancb with scales in situ—natural size; enlarged scales above, at left. (Original.) scales are crushed by scraping, a 3'ellowisli oily liquid will appear, resulting from the crushing of the soft yellow insects beneath the scales and this will at once indicate to one who is not familiar with their ap- pearance the existence of healthy living scales on the trees. They are easily scraped off with the finger nail, and the bark beneath them will be seen to be darker in color. The natural color of the bark is also somewhat chang
. Circular. Insect pests; Insect pests. Fig. 2.—San Jose tjcale. Applo brancb with scales in situ—natural size; enlarged scales above, at left. (Original.) scales are crushed by scraping, a 3'ellowisli oily liquid will appear, resulting from the crushing of the soft yellow insects beneath the scales and this will at once indicate to one who is not familiar with their ap- pearance the existence of healthy living scales on the trees. They are easily scraped off with the finger nail, and the bark beneath them will be seen to be darker in color. The natural color of the bark is also somewhat changed, as will be seen by comparing the places from which the scales have been removed with the spots upon wliich the scales do not occur. The outlines of the removed scales will be noticed upon the bark, and the circumference is frequently changed in color, becom- ing somew^hat purplish, ^^liere the scales do not occur so thickly they are more perceptible, and upon young, reddish twigs the contrast is quite noticeable, as the scales there appear light gray. The younger and smaller scales are darker in color than the older and larger ones, and sometimes appear quite black, while the still younger ones are yellowish. During winter the insect is to be found in the half-grown or nearly full-grown condition. The young begin to hatch and to crawl from under the female scales shortly after the trees leaf out, and from this time through the summer there is a con- stant succession of generations. The young louse is an active, crawling creature, very minute, and yellowish in color. The young spread out upon the new growth of the tree, set- tle down, and each begins to secrete a scale. During its traveling stage it possesses the characters shown at Fig. 3. The male is an active, two- winged insect, and is shown at Fig. 4. The full-grown female loses her legs and antennae, and bears a very slight resemblance to a living insect. In this stage, the species is shown at Fig. Please note
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectinsectpests
