. California greenhouse pests and their control. Insect pests; Greenhouse plants. the shield of the female is thick and the middle ring is smaller. Primarily it is a pest of citrus, but is occasionally taken on various ornamentals both in greenhouses and outside. False parlatoria scale, Pseudoparlatoria par- latorioides (Comstock). Shield of the female is semitransparent yellowish, more or less circular, with nipple marginal. Shield of the male is simi- lar, but smaller and oval. Occasionally it is found in California greenhouses, particularly on phoenix palms and cypripedium orchids. Eradi- c
. California greenhouse pests and their control. Insect pests; Greenhouse plants. the shield of the female is thick and the middle ring is smaller. Primarily it is a pest of citrus, but is occasionally taken on various ornamentals both in greenhouses and outside. False parlatoria scale, Pseudoparlatoria par- latorioides (Comstock). Shield of the female is semitransparent yellowish, more or less circular, with nipple marginal. Shield of the male is simi- lar, but smaller and oval. Occasionally it is found in California greenhouses, particularly on phoenix palms and cypripedium orchids. Eradi- cation measures are taken whenever it is found. Palm fiorinia scale, Fiorinia fioriniae (Tar- gioni). Shield of the female is elliptical, thin, yellowish or brownish, with nipple terminal and remainder of shield formed by second skin which bears a longitudinal ridge. Shield of the male is white and felted. It is found occasionally in California greenhouses, especially favoring palms. CONTROL Control of armored scales is often very difficult because of the protection af- forded by the shield over the body. 1. Light-oil emulsion: may give control where it can be used. Applied most effec- tively when crawlers are active. (See page 56.) 2. Calcium cyanide fumigation: gives very good control for most species, but the California red scale may be resistant. (Seepage 51.) 3. DDT: sprays have given effective control of crawlers of some species and have been used extensively against the Boisduval scale. It is necessary to main- tain a residual on the plants until older scales have died, so applications are re- peated every 3 or 4 months. (See page 52.) 4. Parathion: excellent control of many species, although mature forms may not appear dead for several weeks after ap- plication. (See page 57.) PLUME MOTHS Importance: The caterpillars of several species of plume moths cause damage of economic importance in California. Al- though they may chew on any part of the plant, the most noticeable
Size: 1176px × 2125px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectgreenhousepl, booksubjectinsectpests
