Hemlock woolly adelgid, commonly abbreviated as HWA, is a true bug native to East Asia that feeds by sucking sap from hemlock and spruce trees. In eastern North America, it is a destructive pest that poses a major threat to the eastern hemlock and the Carolina hemlock. The range of Eastern Hemlock extends north of the current range of the adelgid, but there are fears that the adelgid could spread to infect these northern areas as well.
Accidentally introduced to North America from Asia in 1924, HWA was first found in the eastern United States some decades later. In Pennsylvania, for example, the earliest record is from 1967. The pest has now been established in eleven eastern states from Georgia to Massachusetts, causing widespread mortality of hemlock trees. As of 2007, 50% of the geographic range of eastern hemlock has been impacted by HWA.
The presence of HWA can be identified by its egg sacs, which resemble small tufts of cotton clinging to the underside of hemlock branches. Hemlocks stricken by HWA frequently shift to a grayish-green appearance rather than the dark green of healthy hemlocks. In North America, the hemlock woolly adelgid reproduces asexually and can have two generations per year. Between 100 and 300 eggs are laid in the woolly egg sacs beneath the branches. Larvae emerge in spring and can spread on their own or with the assistance of wind, birds and/or mammals. In the nymph stage, the adelgid is immobile and settles on a single tree.
The hemlock woolly adelgid feeds on the phloem sap of tender hemlock shoots. It may also inject a toxin while feeding. The resulting desiccation causes the tree to lose needles and not produce new growth. In the northern portion of the hemlock's range, death typically occurs four to ten years after infestation. Trees that survive the direct effects of the infection are usually weakened and may die from secondary causes.
Discus N/G Insecticide is a versatile, broad-spectrum product that gives long-term con- trol of many insects. Discus N/G is safe on virtually all plant material, offering control of a wide range of insects. Active Ingredient: Cyfluthrin 0.70%, Imidacloprid 2.94% Signal Word - CAUTION / PRECAUCION
Dominion 2L Insecticide, a 21.4% imidacloprid provides long lasting control for Emerald Ash Borer (EAB), adelgids, armored scales, termites and many other boring and sucking insects.Active Ingredient: Imidacloprid 21.40% EPA Signal Word: CAUTION / PRECAUCION
Pointer Imidacloprid Insecticide is one of the most widely used and proven-effective insecticides on the market today. Pointer provides reliable systemic insect control on a wide variety of landscape ornamentals.Active Ingredient: Imidacloprid 5.0% EPA Signal Word - WARNING / AVISO/br>
Retriever Acetamiprid Insecticide for tree injection application using the Wedgle direct-inject system to ornamental or non-bearing fruit and nut trees. Retriever Insecticide may be applied by injection directly into ornamental or non-bearing fruit and nut trees.
The Tree Tech Microinjection Insecticides set a new standard for economical and environmentally safe tree health care. As traditional methods of applying chemicals and pesticides become less suited for environmentally sensitive uses, particularly in urban areas, the Tree Tech microinjection system continues to gain acceptance and wider use.Sold Individually, Case Qty. = 25 Micro-injectors
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EverGreen Pyrethrum Dust Insecticide is a pyrethrin-based botanical insecticide that controls over 230 insects including Bed Bugs, Fleas, Ants, German Cockroaches, and Ticks. OMRI Listed.Active Ingredient: Pyrethrins 1.0% Signal Word - CAUTION / PRECAUCION
Mainspring GNL Insecticide uses a novel active ingredient to quickly control chewing and sucking pests such as leafminers, caterpillars and thrips.Active Ingredients: Cyantraniliprole 18.66% Insecticide Mode of Action Group: 28 Insecticide Class: Anthranillic diamideApplication Rate Range: (see label) Container Size(s): 1 Pt.
Safari 20SG's new generation active ingredient, dinotefuran, controls a broad range of difficult pests including: Emerald Ash Borer, Adelgids, Japanese Beetles, Leafminers, Scales, Thrips, Whiteflies and more.
Treegator Original is a slow release watering bag that is perfect for newly planted or established trees from 1 to 8 inches in trunk diameter, with branches beginning at least 25 inches from the ground or higher.
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