. California greenhouse pests and their control. Insect pests; Greenhouse plants. Species Found In California Greenhouses Snapdragon plume moth, Platyptilia antir- rhina Lange, often is a serious pest of snap- dragons in southern and central California. Geranium plume moth, Platyptilia pica Wals- ingham, is similar to snapdragon plume moth, but particularly prevalent on geranium in the coastal region of southern California. CONTROL Information concerning the use of newer insecticides is not available for the plume moths. Nicotine sulfate, rotenone, lead arsenate, and cryolite have not given ad
. California greenhouse pests and their control. Insect pests; Greenhouse plants. Species Found In California Greenhouses Snapdragon plume moth, Platyptilia antir- rhina Lange, often is a serious pest of snap- dragons in southern and central California. Geranium plume moth, Platyptilia pica Wals- ingham, is similar to snapdragon plume moth, but particularly prevalent on geranium in the coastal region of southern California. CONTROL Information concerning the use of newer insecticides is not available for the plume moths. Nicotine sulfate, rotenone, lead arsenate, and cryolite have not given adequate control. A pyrethrum and me- dium-oil spray has given control of ex- posed caterpillars and adults. LOOPERS Importance: Loopers, or measuring worms, are familiar caterpillars which eat the leaves of a wide variety of ornamental shrubs and trees. Only one species is of economic importance in California green- houses. Appearance: The caterpillars may be recognized by the series of looping move- ments which they make when they crawl. They frequently rest by holding on with the hind legs and straightening the body out. The caterpillars are variously col- ored, about 3/4 inch long when grown. The moths have a slender body and broad, rather delicate wings. The wings are about 1 inch long and are held partly outstretched when at rest. Development: Eggs are usually laid in small clusters on the foliage. As the cater- pillars grow up, large portions of the leaves are consumed. They often fasten leaves together in which to hide during the day, and pass the transformation stage within such a shelter. There are several generations a year. Species Found In California Greenhouses Omnivorous looper, Sabulodes caberata Guenee. Caterpillars usually are yellowish or orange with narrow, green and black stripes. The moth is pale tan in color. The caterpillars. Fig. 42. Injury to snapdragons by caterpillars of the snapdragon plume moth. are general feeders, attacking a wide variety of orname
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Keywords: ., bookcentury1900, booksubjectgreenhousepl, booksubjectinsectpests
