hemlock scale insecticide

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Most contact insecticides cannot penetrate the waxy covering on scale nymphs and adults, so the crawler stage is the only life stage that these insecticides control. Soil-injected systemic insecticides used to manage hemlock woolly adelgid are not effective in managing this species of armored scale insect. This is an ideal time to treat with a registered insecticide formulation applied according to label directions. The pale yellow crawlers are about 1⁄250 inch (0.1 mm) long and have six short legs. The male cover is elongate, white, and about 1.5 mm long. A second spray should be applied in early July, if needed. New York: John Wiley & Sons. The white, waxy cover of the male is smaller. Mated females start to lay second-generation eggs six to eight weeks after mating. Elongate hemlock scale infestation on hemlock. Be sure the product you select is labeled for treating adelgids. The waxy covers of this species can be observed on the lower needle surface as well as on new cones. These less preferred host plants, if infested, are usually growing adjacent to infested hemlocks. The white, waxy cover of the male is smaller. Hemlock woolly adelgid is established in isolated locations in the western Lower Peninsula of Michigan. Elongate hemlock scale has a piercing-sucking mouthpart, which it uses to feed on cell contents within conifer needles. Elongate hemlock scale—sometimes referred to as Fiorinia scale—is an armored scale found more prevalently in southeastern Pennsylvania. There are several options available to homeowners to treat HWA. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Since that time, EHS has spread to 15 states in the eastern US. This species overwinters as fertilized females or eggs. You must have JavaScript enabled in your browser to utilize the functionality of this website. View our privacy policy. Hemlock Trees and their Pests. The elongate hemlock scale is in a group of insects called “armored scales”. The scale covers are waxy and may be so numerous that the needles have a whitewashed appearance. The insect damages hemlock needles by inserting needle-like mouth parts into leaf tissue and removing cell fluids. By entering your email, you consent to receive communications from Penn State Extension. They mate and the fertilized female produces eggs under her scale cover. Elongate Hemlock Scale- Beyond Pest Control is a fast reliable pest control company, We've been in the business since 1971. The scale has long-lived adult females that reproduce slowly over much of the year, leading to a population with highly overlapping life stages. The females and eggs are protected by a hard, waxy covering. 1978, Diseases & Pests of Ornamental Plants, 5th Ed. Elongate hemlock scale outbreaks may increase after a tree has been infested with hemlock woolly adelgid, drought, or other stresses. As with most other armored scales, elongate hemlock sc… 1967, Stimmel 1980). Scale insect numbers increase more slowly on healthy trees compared to trees under stress. The elongate hemlock scale (Fiorinia externa) is native to Japan and was first detected in the US in Queens, New York over a century ago. Elongate hemlock scale (EHS) is primarily found infesting eastern hemlock (Tsuga canadensis) and Carolina hemlock (Tsuga caroliniana), along with fir and spruce in Massachusetts. 1978, Diseases & Pests of Ornamental Plants, 5th Ed. Research has demonstrated that nitrogen fertilization of hemlocks enhanced population increases of this armored scale. Symptoms the host tree experiences include: Females have three developmental life stages after the egg, and males have five. Elongate hemlock scale on hemlock needles: Elongate hemlock scale on hemlock (left, middle (adelgid circled)) and fir (right): Needle discoloration on hemlock (left) and fir (right): Note: other pathogens, pests and processes will cause needle yellowing.

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