. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 10. The western termite. Left, a swarming individual, which will lose its wings when it has paired. Right, a member of the wingless, blind, and sterile soldier caste. Species Found In California Greenhouses Western termite, Reticulitermes hesperus Banks. The soldier of this species has a long and narrow, pale head. This is the common subter- ranean termite along the coast. Black-legged termite, Reticulitermes tibialis Banks, is similar in appearance to the western termite, but the head of the soldier is shor
. California greenhouse pests and their control. Insect pests; Greenhouse plants. Fig. 10. The western termite. Left, a swarming individual, which will lose its wings when it has paired. Right, a member of the wingless, blind, and sterile soldier caste. Species Found In California Greenhouses Western termite, Reticulitermes hesperus Banks. The soldier of this species has a long and narrow, pale head. This is the common subter- ranean termite along the coast. Black-legged termite, Reticulitermes tibialis Banks, is similar in appearance to the western termite, but the head of the soldier is short, broad, and yellow. This species is found char- acteristically in the more arid sections of Cali- fornia. CONTROL Plants may be protected against ter- mite injury with certain of the newer in- secticides which may be mixed with the soil. 1. DDT: excellent control. (See page 52.) THRIPS Importance: Thrips are important pests of ornamental plants. Either the foli- age or buds and flowers are most com- monly attacked, but bulbs and seeds also may be damaged. They feed on plant tis- sues by puncturing the surface and then sucking the liberated juices. A silvering of the leaves results. This may be accom- panied by premature defoliation or else the flowers may be seriously blotched and streaked. Certain species of thrips—the western flower thrips, the Moulton flower thrips, and the onion thrips—are of further im- portance because they serve as carriers of spotted wilt, a serious virus disease of many flowering plants. The nymphs of these thrips acquire the virus by feeding on an infected plant, and they are able to transmit the disease about one week later, after becoming adults. Aside from the plant-feeding thrips which are found in greenhouses, there are several other species which are beneficial inasmuch as they feed on various pests. Appearance: Thrips are slender, very small insects, ranging from 1/50 to 1/25 inch in length when grown. Adults are usually colored dark brow
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