In late January, nymphs resume their growth, molting two or three times before becoming adults in March. San Jose scale. SJS infested bark has a grey, roughened appearance due to scale insects on limbs and trunk. Distribution of San Jose scale, Quadraspidiotus perniciosus (Comst. Contribution a l'etude du peuplement d'un vegetal par Quadraspidiotus perniciosus Comst. San Jose Scale Time to treat crawlers now San Jose scale nymphs have settled near the blossom end of this apple. The San Jose scale, Quadraspidiotus perniciosus, is a pest of fruit trees, but it attacks many other trees as well as shrubs. The insect has since spread throughout much of the United States [4] and Canada. Add Image The San Jose scale is a hemipterous insect (Quadraspidiotus perniciosus)[1] in the family Diaspididae. Tree Fruit Insect Pest - San Jose Scale.

Articles. San Jose scale (SJS) Printer-friendly version. Scales on new growth and fruit produce deep purplish-red coloration in the tissue. Photos. In well-managed orchards, populations of San José scale are generally too low to cause economic damage. Updated: October 25, 2017. The City of San José is HirinG Whether you’re a seasoned professional ready to apply your expertise to the next challenge or you’re a new member of the workforce checking into career options, the City of San José invites you to explore job opportunities and experience the rewards of working in a dynamic and diverse public service environment. San Jose Scale, Quadraspidiotus perniciosus (Comstock) I. Bazarov BB, Shmelev GP, 1971, Akad. 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. ), in the Adelaide Hills. The San Jose scale has no visible egg stage; scales emerge from under the edge of their mother's covering as nymphs. San Jose scale definition: a small E Asian homopterous insect , Quadraspidiotus perniciosus, introduced into the US... | Meaning, pronunciation, translations and examples San José scale (Diaspidiotus perniciosus) is a fruit tree pest that can be found in most fruit growing regions of the United States. Quadraspidiotus perniciosis. Distribution: Widespread and a major pest in most fruit-growing states and provinces in eastern North America. San Jose scale. San Jose scale is the most common scale seen in orchards, and recently became more of a problem, perhaps due to reduced spray programs. Overview. Quadraspidiotus perniciosus (Comstock) Hemiptera: Sternorrhyncha: Diaspididae.