. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 31. Adult females of the hemispherical scale on fern. mottled appearance. Living young are produced. It is primarily a greenhouse pest, although it also is destructive out- doors in California. Practically all types of greenhouse plants serve as hosts. Hemispherical scale, Saissetia hemis- phaerica (Targioni). Adult females are strongly convex, hard, brown, smooth and shining. The skin is covered with tiny, round, pale areas. The undersurface of the female forms a cup as a tremen- dous number of eggs piles u
. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 31. Adult females of the hemispherical scale on fern. mottled appearance. Living young are produced. It is primarily a greenhouse pest, although it also is destructive out- doors in California. Practically all types of greenhouse plants serve as hosts. Hemispherical scale, Saissetia hemis- phaerica (Targioni). Adult females are strongly convex, hard, brown, smooth and shining. The skin is covered with tiny, round, pale areas. The undersurface of the female forms a cup as a tremen- dous number of eggs piles up. A great many plants are subject to attack, ferns being one of the favorites. Other Species Found In California Greenhouses Elongate soft scale, Coccus elongatus (Sig- noret), is similar in appearance to the soft brown scale, but the body is considerably more elongate as a rule. Living young are produced. It is not as commonly encountered as that species, and it is more restricted to greenhouses. A variety of tropical plants serve as hosts, palms being one of the favorites. Orchid soft scale, Coccus pseudohesperidum (Cockerell). Adult female is elliptical and flat- tened, leathery, black, with a narrow yellowish margin, and with thin patches of wax on the back. Living young are produced. This scale is generally distributed on orchids in California greenhouses, dendrobium being a Fig. 32. The orchid soft scale on leaf of den- drobium orchid. Tessellated scale, Eucalymnatus tessellatus (Signoret). The adult female is elliptical and flattened, greenish black and with a network of pale lines. Reproduction is by eggs, but the young emerge from the thin shells immediately after deposition. It is found almost entirely in greenhouses on various tropical plants. Nigra scale, Saissetia nigra (Nietner). The adult female is elliptical, flattened, hardened, and black, the skin being covered with small, ir- regularly divided pale areas. A large number of eggs are laid beneath th
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