. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Entomology; Pests. 214 AN ECONOMIC ENTOMOLOGY. follows shortly thereafter, resulting in a fall supply of beetles, which, as a rule, hibernate. Sometimes a third partial brood of larvae reaches the pupal state, and hibernates in that condition. The arsenites are well-known and approved remedies, used at the rate of one pound in from seventy-five to one hundred gallons of water, and several machines especially intended for spraying potato-fields are on the market. The inse
. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Entomology; Pests. 214 AN ECONOMIC ENTOMOLOGY. follows shortly thereafter, resulting in a fall supply of beetles, which, as a rule, hibernate. Sometimes a third partial brood of larvae reaches the pupal state, and hibernates in that condition. The arsenites are well-known and approved remedies, used at the rate of one pound in from seventy-five to one hundred gallons of water, and several machines especially intended for spraying potato-fields are on the market. The insect maintains itself unchecked, because, while active war is waged against the first Fig. The Colorado potato-beetle, Doryphora lo-lineaia.—a, a, egg patches ; b, b, b, larva in difterent stages of growth ; c, pupa; d, beetle; e, its elytra enlarged. brood, little attention is paid to the second, and this is usually allowed to mature and provide for a new crop the year following. Spraying should be done first as soon as the beetles begin feed- ing, to prevent oviposition if possible ; it should be done a sec- ond time when larvae appear generally, and it should be done as often thereafter as beetles or larva are noticed infesting the plants. The species of Diabrotica are rather slender, with long an- tennae ; of a green or yellow color, with black spots or stripes. The adults feed on leaves, flowers, or pollen, but the larvae, which are white and slender, usually feed in the roots or stems of plants. One of our most common forms, D. vittata, is known as " the striped cucumber-beetle," and is yellow with black stripes on the. 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 Smith, John Bernhard, 1858-1912; Metcalf Collection (North Carolina State University). NCRS. Philadelphia and London : J.
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