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Trunk injection or endotherapy also known as vegetative endotherapy, [1] [2] [3] is a method of target-precise application of pesticides, [4] [5] [6] plant resistance activators, [7] or fertilizers [8] into the xylem vascular tissue of a tree with the purpose of protecting the tree from pests, or to inject nutrients to correct for nutrient deficiencies.
Trunk injections are used for large trees that are near water or where soils are too rocky for soil injections or drenches. The chemical is injected directly into the tree and transported to the twigs and needles where the hemlock woolly adelgids are feeding. Adequate soil moisture is also necessary for the tree to take up these products.
These pesticides make the entire plant, or parts of the plant, poisonous to insects that feed on the plant tissue. Most systemics are very toxic to people and pets. Trunk injections are confined to the tree's cambium layer, where it is carried to the leaf tissue by the movement of the tree's sap.
Sprays with mineral oil (horticultural oil) or the use of systemic pesticides by trunk injection or soil drenches can control the elongate hemlock scale. [8] In North America, natural enemies of F. externa are not very efficient in suppressing the scale populations compared to Japan and as a result, the scale populations in Japan are much smaller.
Sperry said, “If a pecan tree is free-standing, that is, not touching other trees, power lines, etc., you can put a sheet metal collar in place around its trunk.” For larger trees, you’ll ...
Phosphite injected directly into the trunk of affected trees has been shown to stop the progress of the disease, halting sap bleeding, enabling new bark to grow and prolonging the tree's life. [15] This treatment is effective on trees of a consistent size, but research continues on effective dosages for trees of different sizes.
Treating allergy symptoms with over-the-counter medication, saline spray, and, if warranted, allergy medication or injections from your doctor, may also help reduce GI symptoms as a result.
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