The main cause of phytotoxicity using mancozeb
In the process of using mancozeb, many farmers have caused phytotoxicity due to improper drug selection or improper application time, dose and frequency. Light damage caused leaf damage, weakened photosynthesis, affected crop growth, and heavy fruit surface and The leaf surface forms drug spots (brown spots, macula, net spots, etc.), and even causes fruit points to be too large, the fruit surface is rough, and fruit rust is produced, which seriously affects the commercial value of the fruit. The farmers suffer heavy losses. There are several reasons for this:
1. Blind agent mixing affects the safety of mancozeb use. Pesticide compounding should be considered from the aspects of the active ingredients, physical and chemical properties, control effects and control objects of the pesticides. Blind mixing will not only reduce the efficacy of the drug but also increase the risk of drug damage. If it is more common, the combination of mancozeb with alkaline pesticides and heavy metal compounds containing copper will lead to a decrease in the efficacy of mancozeb, and the flocculent precipitation will occur with the combination of mancozeb and phosphate species, accompanied by hydrogen sulfide. The gas is released.
2, do not pay attention to the choice of spraying time, free to adjust the spray concentration to increase the risk of phytotoxicity. In actual use, in order to improve the efficacy of the drug, many farmers prefer to reduce the dilution factor to the highest concentration in the specification when dispensing, even using the highest concentration recommended by the specification, thus increasing the risk of phytotoxicity. At the same time, the farmers mixed and multi-agents, only noticed the difference in the name of the product, and ignored the active ingredients and content. In the process of compounding, the dosage of the same active ingredient was increased, and the concentration of the drug increased in disguise, exceeding the safe concentration. , causing phytotoxicity. When the drug is used under high temperature conditions, the activity of the drug is increased, and the drug is sprayed at a high concentration, and the risk of the drug is increased.
More pesticide knowledge , please pay attention to China Pesticide Network
(Source: 191 agricultural capital)
Fireproof Coating,Tunnel Fireproof Coating,Fireproof Paint For Concrete,Fireproof Paint For Steel Beams
Jiangxi Long Zheng Techinical Developing (Pty) Ltd. , https://www.jxlongzhengkeji.com