The insect has since spread throughout much of the United States [4] and Canada.

It can be found feeding on bark, and when populations are high, it appears on fruit as small pepper-flake spots with a purple halo. San Jose scale definition: a small E Asian homopterous insect , Quadraspidiotus perniciosus, introduced into the US... | Meaning, pronunciation, translations and examples San Jose scales overwinter predominantly (80%) in the black cap stage, although in mild years some adult females may also survive. In late January, nymphs resume their growth, molting two or three times before becoming adults in March. Benassy C, 1969. Overview. San Jose scale definition: a small E Asian homopterous insect , Quadraspidiotus perniciosus, introduced into the US... | Meaning, pronunciation, translations and examples ), in the Adelaide Hills.

It can be difficult to detect before damaging populations occur. Parazitol. The pest, which is active in temperatures over 51 degrees Fahrenheit, is forecasted to give peach growers a run for their money this year. The scales are often difficult to … Infested fruit develop a reddish-purple ring surrounding each spot where a scale settles. Information and translations of san jose scale in the most comprehensive dictionary definitions resource on the web. San Jose Scale, Quadraspidiotus perniciosus (Comstock) I. San Jose Scale Time to treat crawlers now San Jose scale nymphs have settled near the blossom end of this apple. San Jose Scale Ric Bessin, Extension Specialist Entfact-204 San Jose scale is an extremely important indirect pest of apples, pears, peaches, and plums. Articles. Zool. It can be found feeding on bark, and when populations are high, it appears on fruit as small pepper-flake spots with a purple halo. Bazarov BB, Shmelev GP, 1971, Akad. Native to China, this insect was introduced into the United States in the late 1800s. The San Jose scale, Quadraspidiotus perniciosus, is a pest of fruit trees, but it attacks many other trees as well as shrubs. Definition of san jose scale in the Definitions.net dictionary. Agricultural Record, 4(7):54-56. There are three stages during the first instar: the crawler , which is mobile and locates a feeding site; the white cap , which feeds and becomes covered with a waxy secretion; and the black cap , which is a darker, harder wax covering under which they may overwinter. Distribution: Widespread and a major pest in most fruit-growing states and provinces in eastern North America. Scales on new growth and fruit produce deep purplish-red coloration in the tissue.


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