. California greenhouse pests and their control. Insect pests; Greenhouse plants. in about two weeks. Young grubs feed on the tender rootlets, but as they become larger, in the winter or early spring, they may girdle the crowns of smaller plants. The transformation stage is passed in a cell in the ground. The adults emerge in the spring, and they may live for two years, laying several hundred eggs. A very wide variety of plants are at- tacked, although azaleas and camellias are killed the most often. Infestations in greenhouses are usually initiated by bringing in infested soil, but invasion m
. California greenhouse pests and their control. Insect pests; Greenhouse plants. in about two weeks. Young grubs feed on the tender rootlets, but as they become larger, in the winter or early spring, they may girdle the crowns of smaller plants. The transformation stage is passed in a cell in the ground. The adults emerge in the spring, and they may live for two years, laying several hundred eggs. A very wide variety of plants are at- tacked, although azaleas and camellias are killed the most often. Infestations in greenhouses are usually initiated by bringing in infested soil, but invasion may result from the slowly crawling adults. Several other species of Brachy- rhinus have been introduced into Califor- nia, but they have not been found yet in greenhouses. Of her Species Found In California Greenhouses Vegetable weevil, Listroderes obliquus Klug. Adult is moderate sized and brownish; each wing cover has an oblique pale marking and a tubercle near the back end; the snout is short and broad. The grubs are greenish. Both the. -â â Fig. 46. The cattleya weevil feeding on bud of cattleya orchid. adults and grubs feed on the foliage, and the grubs also feed on the roots. Eggs are laid mostly in the fall, and damage is found mostly during the winter and spring. Although principally a pest of vegetables, it is occasionally found in greenhouses feeding on various plants such as cyclamen in seedling flats. Orchid weevil, Diorymerellus laevimargo Champion, is small, shiny black, with a long, curved snout. The adults feed on the flower buds, petals, and young leaves at night and hide in the daytime at the leaf bases or in the potting material. The grubs feed inside the new roots, causing them to blacken and die. Formerly it was a very common and very destructive pest of cattleya and dendrobium orchids in California. Cattleya weevil, Cholus cattleyae Champion, is large and black with conspicuous, white markings on the wing covers, and with a long snout. It is a South Amer
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