When using melon herbicides, pay attention to the use of specifications, learn scientific use of drugs, otherwise it is easy to produce phytotoxicity, China Pesticide Network Xiaobian teaches you specific steps:
Herbicides that can be used in watermelon fields, in addition to the registered herbicides such as diquat, metolachlor, zhongdingling, quizalofop, and high-efficiency flupirtine, other amides such as amides Acetone, diphenyl ether oxyfluorfen, dinitroaniline pendimethalin, cyclic imine grasses, triazines, carbamate, carbamate The phenoxy-based flupirin and other materials have been introduced for weeding in watermelon fields. Among them, butachlor has become the first choice for weeding in most watermelon fields because of its relatively broad herbicidal spectrum, high safety and low cost.
First, the cause of herbicide damage:
First, the product is not properly selected. Some herbicides registered in crop fields such as soybeans, peanuts, cotton, etc., some should not be used in watermelon fields, especially acetochlor, which is sensitive to watermelon. After application, the growth is inhibited, and the dead seedlings are reduced. Serious or even unacceptable.
Second, heat damage will aggravate the phytotoxicity. Watermelons in greenhouses and small arches are prone to heat damage due to steep temperature rise and decidua. In this case, if a highly volatile herbicide is used, it is easy to cause high concentrations of drugs in the air to produce pesticides , which is a serious hazard.
Third, the melon field is not well drained. There is more rain in the growing season of watermelon, and the activity of metformin and other drugs in the case of soil waterlogging is greatly improved, and the safety is drastically reduced, which is easy to cause phytotoxicity. In addition, in sandy soils and soils with low organic matter content, some herbicides are easily infiltrated by rain, which in turn causes phytotoxicity to watermelon.
Second, the technical points of herbicide use:
Use herbicides registered on watermelons and follow the instructions carefully. At the same time, appropriate agents should be selected according to different cultivation methods and the occurrence of weed population. The weeding in watermelon fields is mainly based on soil sealing treatment. It is usually applied before or after transplanting. The post-emergence stem and leaf treatment should be treated with anti-grass weeds, such as quizalofop-p-ethyl and high-efficiency flupirtine. Wait. In areas with high rainfall or poorly drained fields, metformin and other drugs are recommended to use low amounts.
According to the pesticide network , due to the high temperature in the greenhouse and small arch shed watermelon, the liquid is easy to volatilize. It is necessary to smear the film in time and ventilate in time to avoid the high temperature in the shed to cause phytotoxicity. The dosage should be ensured to ensure safety. Membrane watermelons are generally limited to spraying on the cover film rather than on the whole field.
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