What are hormone-type herbicides? A complete guide
What hormone-type herbicides are there? How do hormone-type herbicides work? We'd like knowledgeable readers to help explain. 1. Phenoxycarboxylic acids: the main varieties are 2,4-D butyl ester and MCPA-sodium. Their mode of action is similar to indoleacetic acid; a tiny amount of 2,4-D can promote plant growth, while at high concentrations it inhibits the differentiation of meristematic tissues...
What hormone-type herbicides are there? How do hormone-type herbicides work? We'd like knowledgeable readers to help explain.1. Phenoxycarboxylic acids: the main varieties are 2,4-D butyl ester and MCPA-sodium. Their mode of action is similar to indoleacetic acid; a tiny amount of 2,4-D can promote plant growth, while at high concentrations it inhibits the differentiation of meristematic tissues, stops elongation growth, causes the plant to grow laterally, makes roots and stems swell and blocks conductive tissues, ultimately leading to plant death.
2. Benzoic acids: the main variety is dicamba (Banvel). It also has an indoleacetic acid-like effect, causing the plant's apical growth and leaf formation to stop, tissue proliferation, and deformed plant growth.
3. Quinolinecarboxylic acids: the main varieties are quinclorac (Facet) and quinmerac. They can effectively promote ethylene biosynthesis, leading to the accumulation of large amounts of abscisic acid, causing stomatal closure, reduced water evaporation, reduced carbon dioxide uptake, and slowed plant growth. Interestingly, quinclorac can effectively control barnyardgrass, while quinmerac can effectively control cleavers.
4. Thiazolecarboxylic acids: the main variety is benazolin (Galtak). After application, it is absorbed through the leaves and translocated throughout the entire plant. The symptoms of poisoning in weeds are stunted growth, stiff green leaves that thicken and curl backward, distorted new leaves, shortened internodes, and finally death. It acts quickly at high temperatures and slowly at low temperatures.
5. Pyridyloxyacetic acids: the main varieties are fluroxypyr (Starane), triclopyr (Garlon), and others. After application, they are quickly absorbed by the plant and translocated to all parts of the whole plant, causing sensitive plants to become deformed and distorted. As for their specific mechanism of action, it is still unclear at present.