The symptoms of phytotoxicity caused by herbicides are variability and diversity. Similar to the symptoms of certain diseases, they often cause misunderstandings in diagnosis. The general phytotoxicity is faster than the disease symptoms, and no pathogens appear. The identification of herbicide phytotoxicity should be strengthened in production.
(1) Phenoxycarboxylic acids: commonly used agents are 2,4-D, dimethyltetrachloride, 2,4-butyl butyl ester and the like.
Symptoms are leaf, flower, and ear deformity. Leaves thick, thick green, curly, chicken-claw or onion tubular; stems brittle, fragile, swollen stem; roots short and thick, no root hair, short plants; stop growing in severe cases, cortical cracking, falling flowers, fruit falling, and finally death .
(B) aryloxyphenoxypropionic acid: commonly used agents have a stable kill, grass, grass, canopy, weima, Hummer and so on.
Symptoms are mainly plant malformations, the growth point turns yellowish brown, and the heart leaves are purple or yellow.
(3) Diphenyl ethers: Commonly used agents are herbicides, weeds, and tigers.
Symptoms are brown necrotic spots on the leaves, severe leaf deformities, dry coke, and no new leaves.
(4) Amides: commonly used agents include cable, dur, propanil, butachlor and the like.
Symptoms are light yellow leaves, heavy spots appear spots, curled and shrunk, and finally die.
(5) Carbamates: Commonly used agents are herbicides, herbicides, oats and so on.
Symptoms are leaf curl, many tillers, stem base, new roots are short and short, and plants are short.
(6) Substituting ureas and trichlorobenzenes: mainly green merlon, chlorpyrifos, simazine and so on.
Mainly for chlorosis, heart and leaf tips, yellowing like fire, short plants, slow growth.
(7) Heterocyclics: mainly paraquat, glyphosate, Bean Kewei, oxacillin, and bentazon.
Symptoms are leaf discoloration, yellowing, and finally the plants die.
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