Quinclorac (killing cockroach, killing cockroach) is a hormone-type quinoline carboxylic acid herbicide, which has special effects on controlling valerian, and is suitable for rice stalking, transplanting Honda, and live field mites. Recently, many farmers in Tantou, Sanhe and other places in our county have successively reported to the county plant protection station that different degrees of phytotoxicity have occurred after weeding with 36% benzyl dichloride (containing chloroquinoline 34%) in single-season paddy fields. The heart of the seriously damaged seedlings curled into a tube of onion, and some have died. The lightly affected seedlings, the base of the stem is swollen, hardened and brittle, and the heart leaves are narrowed and twisted into a deformed shape. The symptoms of phytotoxicity usually appear 10-15 days after application. The county plant protection station identified typical phytotoxicity symptoms caused by quinclorac.
There are several reasons for the phytochemical damage caused by quinclorac: First, the application time is earlier. Before the seedling 1 leaf stage, especially in the seedling stage, even if quinclorac is applied in a conventional amount, it is highly susceptible to phytotoxicity. Farmers in Fanping Village of Pingyao Village sprayed benzyl dichloride on the second day after sowing, resulting in serious phytotoxicity. The second is the impact of climate factors. Some time before the application of the plant, there was continuous rain and low temperature, and the quality of the seedlings was poor. It was easy to cause phytotoxicity to rice seedlings after application. High temperature weather is also easy to cause phytotoxicity to seedlings. Third, different rice varieties have different sensitivities to quinclorac. Generally, conventional rice is more sensitive than hybrid rice, and the underdeveloped roots of the seedlings are more sensitive than the roots of the seedlings. Fourth, the dosage is too high. The quinclorac is overused during the appropriate period of use, especially in the case of excessive use of the seedlings before the 4-leaf stage.
Precautionary measures: First, strictly control the application period. Putian is used after the second leaf and after the green field is returned to the young panicle. The second is to strictly control the dosage, generally 50% quinclorac acid dosage of 20-25 grams, up to 50 grams. The third is to drain the field water before application to keep the field moist, so that the liquid directly contacts the stems and leaves of the psyllium, and the water is restored 1 day and night after the medicine and the shallow water layer is kept for 5-7 days. Fourth, it should not be mixed with growth regulators such as paclobutrazol and uniconazole or used at short intervals. Fifth, the residual amount of quinclorac in the soil is large, and it is easy to cause phytotoxicity to the pupa. After the mites should avoid planting Solanaceae (potato, pepper, etc.), Umbelliferae (carrot, celery), Polygonaceae (spinach) , beet), Malvaceae, Cucurbitaceae (various melons), legumes, Compositae, Convolvulaceae and other sensitive crops.
Source: Zhejiang Tiantai Agricultural Technology Station
There are several reasons for the phytochemical damage caused by quinclorac: First, the application time is earlier. Before the seedling 1 leaf stage, especially in the seedling stage, even if quinclorac is applied in a conventional amount, it is highly susceptible to phytotoxicity. Farmers in Fanping Village of Pingyao Village sprayed benzyl dichloride on the second day after sowing, resulting in serious phytotoxicity. The second is the impact of climate factors. Some time before the application of the plant, there was continuous rain and low temperature, and the quality of the seedlings was poor. It was easy to cause phytotoxicity to rice seedlings after application. High temperature weather is also easy to cause phytotoxicity to seedlings. Third, different rice varieties have different sensitivities to quinclorac. Generally, conventional rice is more sensitive than hybrid rice, and the underdeveloped roots of the seedlings are more sensitive than the roots of the seedlings. Fourth, the dosage is too high. The quinclorac is overused during the appropriate period of use, especially in the case of excessive use of the seedlings before the 4-leaf stage.
Precautionary measures: First, strictly control the application period. Putian is used after the second leaf and after the green field is returned to the young panicle. The second is to strictly control the dosage, generally 50% quinclorac acid dosage of 20-25 grams, up to 50 grams. The third is to drain the field water before application to keep the field moist, so that the liquid directly contacts the stems and leaves of the psyllium, and the water is restored 1 day and night after the medicine and the shallow water layer is kept for 5-7 days. Fourth, it should not be mixed with growth regulators such as paclobutrazol and uniconazole or used at short intervals. Fifth, the residual amount of quinclorac in the soil is large, and it is easy to cause phytotoxicity to the pupa. After the mites should avoid planting Solanaceae (potato, pepper, etc.), Umbelliferae (carrot, celery), Polygonaceae (spinach) , beet), Malvaceae, Cucurbitaceae (various melons), legumes, Compositae, Convolvulaceae and other sensitive crops.
Source: Zhejiang Tiantai Agricultural Technology Station
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