. A manual for the study of insects. Insects. paragus bearing the eggs of this beetle, also a beetle and a larva enlarged. The beetle measures about a quarter of an inch in length. Where this pest occurs care should be taken to destroy all wild asparagus. This will force the beetles to lay their eggs upon the shoots that are cut for market. The larvae hatching from such eggs will not have a chance to mature. The Colorado Potato-beetle, Do- ryphora decenilineata (Do-ryph'o-ra dec- em-lin-e-a^ta).—A good many insect tramps have come to us from Europe and from Australia, and appropriated whatever
. A manual for the study of insects. Insects. paragus bearing the eggs of this beetle, also a beetle and a larva enlarged. The beetle measures about a quarter of an inch in length. Where this pest occurs care should be taken to destroy all wild asparagus. This will force the beetles to lay their eggs upon the shoots that are cut for market. The larvae hatching from such eggs will not have a chance to mature. The Colorado Potato-beetle, Do- ryphora decenilineata (Do-ryph'o-ra dec- em-lin-e-a^ta).—A good many insect tramps have come to us from Europe and from Australia, and appropriated whatever pleased them of our grow- ing crops or stored grain. But two of our worst insect pests have swarmed out on us in hordes from their strongholds in the region of the Rocky Mountains. These are the Rocky Mountain Locust and the Colorado Potato-beetle (Fig. 702). The latter insect dwelt near the base of the Rocky Mountains, feeding upon the sand- -^j burr (Solamiin rostratzim), until about the year 1859. ^t ^^^^s time it began to be a pest in the potato-fields of the settlers in that region. Having acquired the habit of feeding upon the cultivated potato, it began its eastward march across the continent, spreading from potato patch to potato patch. At first the migration took place at about the rate of fifty miles a year, but later it was more rapid ; and in 1874 the insect reached the Atlantic coast. The Three - spotted Doryphora, Doryphora clivicollis (D. cliv-i-coriis).—This resembles the Colorado potato-beetle in size and form. It is of a deep-blue color, except the wing-covers, which are orange, with three dark-blue spots on each (Fig. 703).. Fig. 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Coms
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
