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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.
Paraquat is widely used as a suicide agent in developing countries because it is widely available at low cost. Further, the toxic dose is low (10 mL or 2 teaspoons is enough to kill). Campaigns exist to control or even ban paraquat, and there are moves to restrict its availability by requiring user education and the locking up of paraquat stores.
The dangers of this chemical were first suspected in 1949. [7] The U.S. Forest Service, looking to protect tree seeds for reforestation, noted its lethal effect against the rodent populations. Rather than repel wandering scavengers, the chemical was proved to be toxic to the local rodent population for up to 4 years.
Chemicals are still used but in a way that focuses on proper use of pesticide application so overuse does not occur. The fungicide triadimefon is applied to loblolly and slash pine seeds to prevent fusiform rust. If the seeds used are not treated for fusiform rust, the stand can lose 1–30% of their trees to the rust.
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Following absorption into the fungus or bacterium, the copper ions will link to various chemical groups (imidazole, phosphate, sulfhydryl, and, hydroxyl groups) present in many proteins and disrupt their functions. Copper ions can kill pathogen cells on plant surfaces, but once a pathogen enters host plant tissue, it is no longer susceptible to ...