. California greenhouse pests and their control. Insect pests; Greenhouse plants. THREAD-FOOTED MITES Importance: The thread-footed mites comprise a small group which contains a few serious pests of ornamental plants. Growing tips of plants and young leaflets are characteristically deformed as a re- sult of their feeding. The presence of these tiny mites in a greenhouse is seldom de- tected until a severe infestation has de- veloped. Economic losses are due not only to the plant damage incurred but also to the labor and materials wasted in ineffec- tive efforts for control. Several species of
. California greenhouse pests and their control. Insect pests; Greenhouse plants. THREAD-FOOTED MITES Importance: The thread-footed mites comprise a small group which contains a few serious pests of ornamental plants. Growing tips of plants and young leaflets are characteristically deformed as a re- sult of their feeding. The presence of these tiny mites in a greenhouse is seldom de- tected until a severe infestation has de- veloped. Economic losses are due not only to the plant damage incurred but also to the labor and materials wasted in ineffec- tive efforts for control. Several species of thread-footed mites which are found in greenhouses are not known to be of economic importance. These are presumed to feed on decaying organic material or Appearance: Adult mites are elliptical in shape, more or less flattened, brownish, and shining. They are not over 1/100 inch in length. The immature stages are white. The eggs are elliptical and white. It is by the characteristic damage that the pres- ence of these mites is usually suspected. Development: The eggs are laid on protected surfaces of the plant tissues where the mites are feeding. These hatch into six-legged larvae in from 3 to 7 days. The larval period is completed in from 1 to 4 days. A resting stage follows which lasts from 2 to 7 days before the adult emerges. The adult female may lay from 1 to 3 eggs during a day, and the total number laid by a single female ranges from 12 to 16. Breeding continues throughout the year under greenhouse conditions. Important Greenhouse Species Cyclamen mite, Tarsonemus pallidus Banks, feeds characteristically at the ori- gin of new plant growth, in the buds or unfolding leaflets so that the leaves or flowers formed are aborted and mis- Fig. 5. The cyclamen mite: adult female. Fig. 6. Crippled terminal growth of Hahn's ivy caused by the cyclamen Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabi
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Keywords: ., bookcentury1900, booksubjectgreenhousepl, booksubjectinsectpests
