. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. POTATO PESTS 1727. Fig. 1. Potato Tuber Moth (Phthorimaea operculella Zeller). 1, cocoons containing chrysalids; 2, larvae; 3, bare chrysalids. (Enlarged.) —Essig grown they are about one inch long. The cocoon is spun of fine white web, the chrysalis being light brown in color and about three-eighths of an inch in length. The wings of the adults
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. POTATO PESTS 1727. Fig. 1. Potato Tuber Moth (Phthorimaea operculella Zeller). 1, cocoons containing chrysalids; 2, larvae; 3, bare chrysalids. (Enlarged.) —Essig grown they are about one inch long. The cocoon is spun of fine white web, the chrysalis being light brown in color and about three-eighths of an inch in length. The wings of the adults are decidedly gray in color with the bodies silvery. They are about one inch long. Life History The small pearly-white eggs are laid on the stems of growing potato plants or upon exposed tubers in early summer, or upon the tubers at digging time. Within 15 days they hatch into caterpillars, which feed upon the leaves, stems or tubers, or only upon the latter when they are stored in bins. It requires from three to five weeks to mature, when it seeks a shaltered place and spins a cocoon, in which to pupate. During the winter the pupal period may occupy several months, but in the summer and fall from 14 to 20 days are required. The adults are night. 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 Lowther, Granville, ed; Worthington, William, 1871-. North Yakima, Wash. , The Encyclopedia of Horticulture Corporation
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Keywords: ., bookcentury1900, booksubjectfruitculture, booksubjectgardening
