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in the Urban Forest
 
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Fort Collins Tree Care Fort Collins Tree Care
Click for a FREE estimate
or call 970.484.3084
Dedicated to Tree Preservation in the Urban Forest
Fort Collins Tree Care Fort Collins Tree Care
Click for a free Estimate or call 970.484.3084
Dedicated to Tree Preservation in the Urban Forest
Fort Collins Tree Care
or call 970.484.3084

Damage caused by striped pine scale

Striped Pine Scale damages many conifers in Colorado. It prefers to feed on scotch pine, but will also feed on pinyon, austrian and lodgepole pine. Feeding removes sap from the tree causing decreased vigor, needle drop and dieback, and increaes susceptibility to disease and attacks by other pests. Heavy infestations can even kill branches. The striped pine scale females excrete a sticky honeydew that attracts ants, bees and wasps. Mold growing on the honeydew can give the tree a grayish cast.

Striped Pine Scale R. Scott Cameron, Advanced Forest Protection, Inc., Bugwood.org

How to identify striped pine scale

Large numbers of ants, bees and wasps or a dark gray sooty mold may be caused by the honeydew excreted by the striped pine scale.

Eggs are laid in clusters of hundreds under the mature female scale. Eggs hatch into very active orange to brown nymphs or crawlers.

The adult female striped pine scale is hemispherical or helmet-shaped, wrinkled, up to 1/4" in diameter, light brown to reddish brown with dark brown to black markings and cream colored stripes on the back. They are always found attached to twigs at the base of needles. They have a dark red blood. The adult males are much smaller and have wings.

Striped Pine Scale Eric R. Day, Virginia Polytechnic Institute and State University, Bugwood.org

Life cycle of the striped pine scale

The striped pine scale overwinters as females, usually fertilized immature females, but some are mature females. These females start feeding in early spring, start laying eggs in May and early June, which hatch into nymphs or crawlers starting in early June. The crawlers move around the tree for a couple days, then settle down and molt, losing their legs and mobility. Female striped pine scales stay on the twig bark at the base of needles, and males move to the needles. They mate in late summer, then lay eggs, which hatch and overwinter.

Striped Pine Scale William M. Ciesla, Forest Health Management International, Bugwood.org

How to control striped pine scale

Although natural predators eat many striped pine scale insects, they are not a very effective control for infested trees. Striped pine scale populations can be reduced by spacing trees far enough apart that crawlers can't move from one tree to another, and by removing infested branches.

Horticultural oils may be effective if applied in early Fall or spring, Insecticides are best sprayed in early June on the striped pine scale and systemic insecticides are best applied to the soil near the tree in the spring.

Striped Pine Scale R. Scott Cameron, Advanced Forest Protection, Inc., Bugwood.org

Striped Pine Scale United States National Collection of Scale Insects Photographs Archive, USDA Agricultural Research Service, Bugwood.org

 
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301 E. Douglas Road
Fort Collins, CO 80524
970.484.3084
Fort Collins Tree Care Inc.
301 E. Douglas Road
Fort Collins, CO 80524
970.484.3084
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