. California greenhouse pests and their control. Insect pests; Greenhouse plants. Cactus scale, Diaspis echinocacti (Bouche), closely resembles the Boisduval scale but is found only on various cacti. It is a common pest in California, both in the greenhouses and out- side. Mining scale, Howardia biclavis (Comstock). Shield of the female is whitish, circular, convex, with terminal nipple. It has the habit of bur- rowing beneath the outer bark, so that it is usu- ally recognized by the nodular stem swellings on older wood and roots. It is a species which occurs on various tropical plants and has
. California greenhouse pests and their control. Insect pests; Greenhouse plants. Cactus scale, Diaspis echinocacti (Bouche), closely resembles the Boisduval scale but is found only on various cacti. It is a common pest in California, both in the greenhouses and out- side. Mining scale, Howardia biclavis (Comstock). Shield of the female is whitish, circular, convex, with terminal nipple. It has the habit of bur- rowing beneath the outer bark, so that it is usu- ally recognized by the nodular stem swellings on older wood and roots. It is a species which occurs on various tropical plants and has been found in several localities in California. Cycad scale, Furcadiaspis zamiae (Morgan). Shield of the female is circular, slightly convex, with marginal nipple, and with outer ring cot- tony white. It occurs on the leaves of various cy- cads and is frequently found in California. Lesser snow scale, Pinnaspis strachani (Coo- ley) , is very similar to the aspidistra scale, but the shield of the female is white. This species has been found in California several times, par- ticularly on sansevieria, ferns, and cycads. It is eradicated when detected. Purple scale,Lepidosaphes beckii (Newman). Shield of the female is oystershell-shaped, elon- gate and generally curved, purplish or brownish in color. Shield of the male is similar but smaller and more elongate. Although primarily a pest of citrus, it is occasionally found on various orna- mentals in greenhouses and outside. Cymbidium scale, Lepidosaphes machili (Maskell), closely resembles other oystershell scales, but is found only on cymbidium orchids. Severe infestations are occasionally found in California greenhouses. Mackie scale, Lepidosaphes mackiana Mc- Kenzie, closely resembles other oystershell scales, but is found beneath the sheath on stems of dendrobium orchids. It has been found several times in southern California greenhouses. Noxious scale, Lepidosaphes noxia McKenzie, closely resembles the Mackie scale and also oc
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