Causes and preventive measures of quinclorac poisoning
Chloroquinolinic acid is a quinoline carboxylic acid herbicide. It has special effects on controlling valerian. It is suitable for paddy field, transplanting Honda, and removing sorghum in live field. Recently, many farmers in the county of Tangtou and Sanhe have successively reported to the county plant protection station that different levels of phytotoxicity occurred after weeding with 36% benzyl dichloride (including quinclorac 34%) in the single-crop rice field. The severely damaged seedlings were curled into the onion tube, and some had already died. In lightly affected seedlings, the base of the stem enlarges, becomes hard, becomes brittle, and the heart becomes narrow and distorts into a deformity. The symptoms of phytotoxicity generally appear 10-15 days after application. The county plant protection station identified the typical symptoms of quinacrycin caused by pesticides.
Causes of quinclorac poisoning for the following reasons: First, the application time is early. Before the first leaf stage of seedlings, especially in the early stage of seedlings, chloroquine acid is prone to phytotoxicity even if it is applied in the conventional amount. For example, farmers in Fanping Village Fanping sprayed benzyl dichloride on the second day after sowing, resulting in serious injury. The second is the impact of climate factors. Some days before the application, even rainy or cold temperatures were encountered. The quality of seedlings was poor, and it was easy to cause injury to rice seedlings after spraying. High temperature weather can also easily cause phytotoxicity on seedlings. Third, different rice varieties have different sensitivity to quincloracic acid. Conventional rice is more sensitive than hybrid rice, and the undeveloped root system of the seedling is more sensitive than the root system of the seedling. Fourth, the amount of medication is too high. The use of quinclorin over the appropriate period of use, especially before the four-leaf stage of seedlings, is susceptible to phytotoxicity.
Preventive measures: First, strictly control the application period, Putian after the second leaves, Daejeon after returning green until the spike differentiation. The second is to strictly control the amount of drugs, generally 50% quincloracic acid dosage of 20-25 grams, can not exceed 50 grams. Third, before the application of the first row of dry water to keep the Tianzhong moist, so that the liquid directly contact with the grass stems and leaves, 1 day and night after the drug to restore irrigation and maintain shallow water layer 5-7 days. The fourth is not to be mixed with paclobutrazol, uniconazole and other growth regulators or used in short-term intervals. Fifth, chloroquine residues in the soil are relatively large, and it is easy to produce phytotoxicity to the posterior pods. After the pods, solanaceae (potatoes, peppers, etc.), umbelliferae (carrots, celery), and Polygonaceae (spinach) should be avoided. , Beet), Malvaceae, Cucurbitaceae (various melons), Leguminosae, Compositae, Convolvulaceae and other sensitive crops.
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