. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. OF THE FAEM AND GARDEN. 251 five generations during the year, and taking the lowest of the above figures, the immense prolificacy of the spe- cies becomes manifest. As summer advances, they fre- quently become prodigiously multiplied, completely cov- ering the leaves with their galls, when they appear as in figure 153. The lice also settle on the tendrils, leaf-stalks, and tender branches, where tbey also form knots and rounded excrescences (figure 152, e), much resembling those made on the roots. In suc
. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. OF THE FAEM AND GARDEN. 251 five generations during the year, and taking the lowest of the above figures, the immense prolificacy of the spe- cies becomes manifest. As summer advances, they fre- quently become prodigiously multiplied, completely cov- ering the leaves with their galls, when they appear as in figure 153. The lice also settle on the tendrils, leaf-stalks, and tender branches, where tbey also form knots and rounded excrescences (figure 152, e), much resembling those made on the roots. In such a case, the vine loses its leaves prematurely. Usually, however, the. Fig. 153.—LEAI' OF THE QKAPE-VINE WITH PHTIiLOXERA OALL. natural enemies of the louse seriously reduce its numbers by the time the vine ceases its growth in the fall, and the few remaining lice, finding no more succulent and suitable leaves, seek the roots. Thus, by the end of September, the galls are mostly deserted, and those wliich are left are almost always infested with mildew, and eventually turn brown and decay. On the roots, the young lice attach themselves singly or in little groups, and thus hibernate. The male gall-louse has never been. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Treat, Mary, b. 1835. New York, Orange Judd
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1887
