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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.
Standing beneath the tree during rain can cause blistering of the skin from even a small drop of rain with the latex in it. Burning tree parts may cause blindness if the smoke reaches the eyes. The fruit can also be fatal if eaten. Many trees carry a warning sign, while others have been marked with a red "X" on the trunk to indicate danger.
Picloram is a systemic herbicide used for general woody plant control. It also controls a wide range of broad-leaved weeds, but most grasses are resistant. [3] A chlorinated derivative of picolinic acid, picloram is in the pyridine family of herbicides.
Both chemicals are non-selective, long-lasting, and effective in weed control. They are, however, water-soluble, and depending on soil type and moisture they can move into parts of the landscape where they were not sprayed. Some desirable landscape plants are especially sensitive to them and can be damaged. [citation needed]
The sawyers like to spawn near dying or dead pine trees, so it is advised to cut down these trees until next spring. The timber is subsequently chipped, burned or sprayed with insecticide to kill the sawyer larvae and pupae in the wood. The adult sawyers go out from the timber in late spring or early summer.
An obvious side effect of using a chemical meant to kill is that one is likely to kill more than just the desired organism. Contact with a sprayed plant or "weed" can have an effect upon local wildlife, most notably insects. A cause for concern is how pests, the reason for pesticide use, are building up a resistance.
The use of herbicides as a chemical weapon by the U.S. military during the Vietnam War has left tangible, long-term impacts upon the Vietnamese people and U.S soldiers that handled the chemicals. [37] [38] More than 20% of South Vietnam's forests and 3.2% of its cultivated land were sprayed at least once between during the war. [39]
Phytoncides are antimicrobial allelochemic [dubious – discuss] volatile organic compounds derived from plants.The word, which means "exterminated by the plant" [citation needed] (from the Greek φυτόν "plant" and the Latin caedere "to kill"), was coined in 1928 by Boris P. Tokin, a Soviet biochemist then studying at Moscow State University. [1]
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