. California greenhouse pests and their control. Insect pests; Greenhouse plants. The cornicles are long and slender with black ends. Summer forms enter green- houses to feed on a large variety of plants. The favorite winter host is rose. Other Species Found In California Greenhouses Chrysanthemum aphid, Macrosiphum san- borni (Gillette), is a large, slender, shining dark brown or black species. The cornicles are short, somewhat bottle-shaped. It is common, but infests only chrysanthemum. Geranium aphid, Macrosiphum pelargonii (Kaltenbach), is similar to the potato aphid, but only green in col
. California greenhouse pests and their control. Insect pests; Greenhouse plants. The cornicles are long and slender with black ends. Summer forms enter green- houses to feed on a large variety of plants. The favorite winter host is rose. Other Species Found In California Greenhouses Chrysanthemum aphid, Macrosiphum san- borni (Gillette), is a large, slender, shining dark brown or black species. The cornicles are short, somewhat bottle-shaped. It is common, but infests only chrysanthemum. Geranium aphid, Macrosiphum pelargonii (Kaltenbach), is similar to the potato aphid, but only green in color. It is restricted to ger- anium and is often abundant on the growing tips. Pea aphid, Macrosiphum pisi (Kaltenbach), is similar to the potato aphid, but only green in color. It is restricted to legumes, often being in- jurious to sweet peas. Rose aphid, Macrosiphum rosae (Linnaeus), is similar to the potato aphid, but the cornicles are black. It is found commonly on roses, either outside or in greenhouses, preferring the tender shoots and buds. Small green rose aphid, Myzaphis rosarum Walker, is much smaller than the rose aphid, plumper, and always greenish in color. It is more likely to be distributed over the plant, rather than preferring new shoots. Attacks are con- fined to certain varieties of roses. Fern aphid, Idiopterus nephrolepidis Davis, is a small, black species with whitish legs and clouded wing veins. It is often taken on maiden- hair, holly, Boston, and brake ferns, occurring both in greenhouses and outside. Violet aphid, Micromyzus violae (Pergande), is dark reddish or brownish, with clouded wing veins and club-shaped cornicles. Although it is widely distributed, infestations are restricted to violets. It is sometimes a serious pest. Black citrus aphid, Toxoptera aurantii (Fons- colombe), is a plump, dark brown aphid with distinctive wing venation. It is a common pest of camellias which sometimes enters green- houses to feed on gardenias and various tropical
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Keywords: ., bookcentury1900, booksubjectgreenhousepl, booksubjectinsectpests
