WSU CAHNRS and WSU Extension

Hortsense

Search plant problems by plant name

? Help on search

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  R  S  T  V  W  Y 

Problem
(factsheet)
Plant NameTypeDescription 
Cottony camellia scaleYewInsectThe adult cottony camellia scale is a flat, oval, brownish insect. It is also found on holly and camellia. The scales overwinter on twigs or needles. In the spring, adult females lay cottony egg masses on the underside of needles. The yellowish crawlers (immature scales) feed on the needles. Feeding cottony camellia scales produce large amounts of honeydew, a sweet, sticky material which often develops a growth of dark sooty mold. Honeydew may also attract ants. Foliage with scale infestations may turn yellowish or pale. The cottony camellia scale is also commonly found on holly and camellia.
Lecanium scaleYewInsectLecanium scales are shiny brown insects found on leaves and twigs. Adults are 1/8"-1/4" in diameter and roughly turtle-shaped. Crawlers (immature scales) are flatter. Scales produce large amounts of honeydew, a sweet, sticky material which may attract ants or become covered with a heavy growth of dark sooty mold. Heavily infested plants may appear yellowish or wilted, or show other signs of stress. New growth may be stunted. Lecanium scale is a common pest in the landscape, infesting many plants including dogwood, maple, rhododendron, willow, and fruit trees.
Root weevilsYewInsectRoot weevil larvae feed on the roots and bark of plants near the crown. The white grubs are found in the soil around the roots. Larval feeding can cause significant damage, sometimes resulting in girdling of roots or crown and causing decline or death of the plant. Adult black vine weevils (one species of root weevil) may feed on yew foliage, but cause little damage. Symptoms of adult feeding include needles that are notched or cut off. Adult root weevils range in size from 1/4" to 1/2" long. They are brownish to black, flightless beetles which climb into the foliage to feed at night.