There are four main types of hormonal herbicides currently in production:
First, phenoxycarboxylic acid varieties such as 2î–„4-D butyl ester, 2 methyl 4-chloro sodium. The action pathway is similar to indoleacetic acid. A small amount of 2î–„4-D butyl ester can promote plant growth. At high concentrations, the differentiation of meristems is inhibited, elongation growth stops, and plants grow laterally, causing roots and stems to swell. , blocking the tissue, leading to plant death.
Second, benzoic acid varieties such as wheatgrass hunters and grasses. There is also a similar effect to indole acetic acid, which can lead to plant apical growth and leaf formation stop, tissue hyperplasia, and plant growth malformation.
Third, quinoline carboxylic acid varieties such as quinclorac bismuth chlorpyrifos, chloro potassium quinolinic acid. It can effectively promote the biosynthesis of ethylene, resulting in the accumulation of a large amount of abscisic acid, resulting in shrinkage of pores, reduction of water evaporation, reduction of carbon dioxide absorption, and slowing of plant growth. Interestingly, quinclorac is effective against valerian, and chloro potassium quinolinate is effective against swine fever.
Fourth, thiazole carboxylic acid varieties such as grass remove Ling Gao Teke. After application, the drug solution is absorbed by the leaves and transported to the entire plant body. Symptoms of weed poisoning are: growth stagnation, leaf blade is green, thickening and rewinding, new leaves are twisted, internode shortening, and finally death. High temperatures are fast, and low temperatures are slow.
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