. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 19. Immature stages and adults of the greenhouse whitefly on underside of geranium leaf. weeks. The adult female lives about one month, laying from 50 to 150 eggs. Important Greenhouse Species Greenhouse whitefly, Trialeurodes va- porariorum (Westwood). Immature stages are pale greenish, semitransparent, and the covering of the transformation stage is armed with long and short transparent threads. Adults are pure white. It is a common greenhouse pest throughout the country, and in California also is found in
. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 19. Immature stages and adults of the greenhouse whitefly on underside of geranium leaf. weeks. The adult female lives about one month, laying from 50 to 150 eggs. Important Greenhouse Species Greenhouse whitefly, Trialeurodes va- porariorum (Westwood). Immature stages are pale greenish, semitransparent, and the covering of the transformation stage is armed with long and short transparent threads. Adults are pure white. It is a common greenhouse pest throughout the country, and in California also is found in lath houses and gardens. A very wide variety of plants may be infested, particu- larly pelargonium, fuchsia, bouvardia, hibiscus, and lantana. Other Species Found In California Greenhouses Iris whitefly, Aleyrodes spiraeoides Quain- tance. Covering of transformation stage is yel- low, devoid of any fringe. Adults are white with two dusky spots on each of the fore wings and one spot on each of the hind wings. Although primarily a pest of iris, it also infests a variety of other ornamental plants and weeds. This species is common, being most abundant out- doors in the late summer and fall. Fern whitefly, Aleurotulus nephrolepidis Quaintance. Covering of transformation stage is bright yellow, without any fringe. Adults are pure white. This species is found infrequently on various ferns in greenhouses and homes. Azalea whitefly, Aleyrodes azaleae Baker and Moles. Covering of transformation stage is light yellowish, without waxy secretions. Adults are uniform pale yellow. Although found on azaleas throughout California, it does not appear to be a very serious pest. Citrus whitefly, Dialeurodes citri (Riley and Howard), is similar in appearance to the green- house whitefly, except lacking the threads on the covering of the transformation stage. It is a serious pest to citrus and many ornamentals. It has been introduced into California several times, but eradication measures are empl
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