1. The herbicide was not properly selected to cause phytotoxicity to flax; 2. The dosage of herbicide was arbitrarily increased, repeated spraying was applied, and the amount of phytotoxicity was increased; 3. The spraying time was delayed too soon. Poor drug resistance caused by phytotoxicity; 4. Poor atomization of the liquid, was sprayed on flax droplets, the amount of drug per unit area increased phytotoxicity.
Second, commonly used herbicides in flax seedlings
(i) 25% bromobenzonitrile EC (20% octanoic benzonitrile, 40% dimethyl benzonitrile (bromobenzonitrile + dimethyl tetrachloro)) EC. (B) The main properties of bromoxynil. 1. Selective postemergence shoots and leaves to handle contact herbicides. The agent is absorbed through the leaves and conducts extremely limited conduction in the plant. By inhibiting various processes of photosynthesis, the plant tissue is rapidly necrosed. 2. Mainly used in cereals, flax, garlic, onions and other places, post-emergence control of broad-leaved weeds in the seedlings, scallions, oysters, alfalfa, wheatgrass, solanum, cocklebur, pigweed, Mai Jiagong, Tian Convolvulus, buckwheat vines and other broad-leaved weeds. 3. When flax is applied at a dose of 5 to 10 centimeters, the dosage per acre does not exceed 18 ml. It is not safe to administer the flax after budding. 4 can be mixed with dimethyl tetrachloride to improve efficacy, expand the spectrum of killing grass. It can also be used in combination with shamrock, wild yam, and wild oats.
Third, the use of methods
Flax 5 ~ 10cm when the application, mu with 25% bromo benzone EC 50-70 ml, 30 kg evenly sprayed.
Fourth, pay attention to matters
1. In strict accordance with the instructions for use of drugs, do not arbitrarily increase the dosage, so as not to cause injury. 2. After flax seedlings emerged and pregnant buds, do not use drugs and the application is not safe. 3. When the temperature is too high and the humidity is too high, the pesticide cannot be applied, and the phytotoxicity is prone to occur. 4 should not be mixed with fertilizers, can not add additives, but also easy to cause injury.
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