. 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. 50 ENCYCLOPEDIA OP PRACTICAL HORTICULTURE the bark. These immediately seek new tender bark to feed on and their num- bers are reinforced by young lice that have hibernated in crevices of the bark under the dead bodies of lice of the pre- vious year, and by an upward migration of lice from the roots. Above ground the only lice that survive the win
. 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. 50 ENCYCLOPEDIA OP PRACTICAL HORTICULTURE the bark. These immediately seek new tender bark to feed on and their num- bers are reinforced by young lice that have hibernated in crevices of the bark under the dead bodies of lice of the pre- vious year, and by an upward migration of lice from the roots. Above ground the only lice that survive the winter are. Fig. 6. Winged and Wingless Female of Woolly Aphis. Much enlarged. —Author's Illustration. the very small hibernants of the last sum- mer generation and those hatching in spring from winter eggs. On the roots under a more even temperature the lice live through the winter in comfort. At maturity the lice of the spring and sum- mer generations are all wingless, about one-tenth of an inch long, reddish-brown covered with a white cottony filamentous secretion. The lice are very gregarious and when massed together are often en- tirely hidden from view by this woolly covering. The wingless forms produce parthenogenetically as many as 100 young in two weeks. These develop in about two weeks. In September a winged gen-. 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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