. Circular. Insect pests; Insect pests. Fig. 1.—Winter-eggs of the Hop Plant-louse, and shriveled skin of the sexual female which laid them —enlarged. Wherever it occurs, whether iu England or on the continent of Europe, in New York,Wisconsin, or on the Pacific coast, the Hop Plant-louse has substantially the same life round. The eggs are laid in the fall on dif- ferent varieties and species of the Plum, both wild and cultivated. They are small, glossy, black, ovoid, and are attached to the terminal twigs especially iu the more or less protected crevices around the buds (Fig. 1). From this egg
. Circular. Insect pests; Insect pests. Fig. 1.—Winter-eggs of the Hop Plant-louse, and shriveled skin of the sexual female which laid them —enlarged. Wherever it occurs, whether iu England or on the continent of Europe, in New York,Wisconsin, or on the Pacific coast, the Hop Plant-louse has substantially the same life round. The eggs are laid in the fall on dif- ferent varieties and species of the Plum, both wild and cultivated. They are small, glossy, black, ovoid, and are attached to the terminal twigs especially iu the more or less protected crevices around the buds (Fig. 1). From this egg there hatches iu the spring, about the time when the plum buds begin to burst, a stout female plant-louse, known as the stem-mother, which differs from the sum- mer individuals bj^ having shorter legs and shorter honey-tubes (Fig. 2). She gives birth, without the intervention of the male, to living youDg, and this method of propagation continues till the last generation of the sea- son. The second generation grows to full size and giv^es birth to a third, which becomes winged (Fig. 3), and develops after the hops have made considerable growth in the yards. The winged lice then fly from the plums to the hops, deserting the plum trees entirely and settling upon the leaves of the hops, where they begin giving birth to another ^^"'- ^- - ^'^^ ^**p PJ^^it-iouae, V <=: c c stem-mother, with enlarged an- of wingless individuals. tenna above—enlarged. 3. 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 United States. Bureau of Entomology. [Washington, D. C. ] : The Division
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectinsectpests
