. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 25. The palm mealybug on a Kentia palm leaflet. Immature stages, adult females, and male cocoons are Fig. 26. The striped mealybug on nephthytis. Other Species Found In California Greenhouses Citrophilus mealybug, Pseudococcus gahani Green, is similar in appearance to the Mexican mealybug in having four rows of thinly waxed depressions down the back, of which the middle pair is most conspicuous. The body fluid, how- ever, is clear and red. Large egg masses are laid. This species prefers cooler temper
. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 25. The palm mealybug on a Kentia palm leaflet. Immature stages, adult females, and male cocoons are Fig. 26. The striped mealybug on nephthytis. Other Species Found In California Greenhouses Citrophilus mealybug, Pseudococcus gahani Green, is similar in appearance to the Mexican mealybug in having four rows of thinly waxed depressions down the back, of which the middle pair is most conspicuous. The body fluid, how- ever, is clear and red. Large egg masses are laid. This species prefers cooler temperatures, and is more apt to be a serious pest outdoors. It is often found in greenhouses, however, on such hosts as English ivy and rubber plant. Palm mealybug (coconut mealybug), Pseu- dococcus nipae (Maskell), has the body covered with cream-colored or yellowish wax which forms rows of humps. Filaments are absent. No eggs are laid. The palm mealybug is found particu- larly on palms, although other tropical plants sometimes serve as hosts. It is found chiefly in greenhouses, but is common outdoors in south- ern California. Striped mealybug, Ferrisia virgatus (Cock- erell). The body is dark purple and thinly cov- ered with white powder except for two black, broken lines down the back. Numerous long and very delicate filaments are secreted. It ordinarily rests with most of the body held elevated from the plant. No eggs are laid. This species is found occasionally in California greenhouses on such plants as nephthytis and croton. It is eradicated whenever recognized. Amaryllis mealybug, Trionymus peregrinus (Green). The body is grayish with a coating of white, powdery wax except for thinner cross- bands. This species is found infrequently, oc- curring only on clivia or related amaryllis-like plants. It lies concealed between the bases of the leaves, surrounded by masses of wax. CONTROL Mealybugs are often very difficult to control, particularly those species which lay eggs. High-p
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