How to use pesticides after jointing wheat

Wheat and weeds have different levels of sensitivity to herbicides at different times. They also have different safety performances for wheat. Different herbicides have different properties. Therefore, it is very important to correctly grasp the application period, especially after the jointing of wheat to young ears. During the application of differentiation, more attention should be paid to the safety of herbicides to wheat. At present, there are many kinds of wheat herbicides, and most varieties require the use of wheat before jointing. However, it is not appropriate to use drugs after the jointing of wheat. Otherwise, it may easily cause phytotoxicity to varying degrees.

For example, a mixture of toluene can be used to prevent various broad-leaved weeds. It uses 20% dimethyl tetrachlorohydrin (125 ml) plus 40% Bentazon Water Solution (100 ml) per acre, and sprays water at 30 kg. The spraying time is wheat. It is advisable before jointing, and the mixture should only be applied to rice crops. Wheat, rice, and other grass crops are sensitive to dimethyl tetrachlorine at the seedling stage. After the 3-4 leaf stage, the resistance gradually increases, the strongest at the end of the tillering stage, and the sensitivity increases at the spikelet differentiation stage. Therefore, it is generally required in the crop 4 Leaf stage to the joint before spraying. 40% paraquat and 2,4-D butyl ester can not be used after the jointing of wheat, otherwise it is easy to cause phytotoxicity to wheat. If it is used too late, it will cause wheat not to be granulated. The application of wheat from the jointing stage to the booting stage is the time when wheat's vegetative growth and reproductive growth go hand in hand. The anti-drug resistance is poor and sensitive. It is easy to produce phytotoxicity, inhibit the growth of wheat, cause childbirth to die, ear deformity, and the growth is slow. Therefore, it should be applied before the jointing, such as the jointing booting stage of wheat is more sensitive to thrips, dimethyl tetrachlorine, dicamba and other herbicides. After application, it is easy to cause curling of wheat leaves, yellowing of wheat seedlings, and suppression of growth. Destruction of ear differentiation, not normal heading or wheat ear deformity. The use of herbicides containing tribenuron-methyl in wheat fields in spring wheat fields will easily result in damage to cotton seedlings, soybeans, and other crops after harvest, and should be applied before winter. The planting period should not be less than 60 days from the crops of the lower crops to ensure that the crops are applied to the crops. Security.

In the spring wheat field, we need to use herbicides such as thrips and horses to control aphids and other weeds. Isoproturon has a good control effect on weeds with small leaf age, wheat weeds at the jointing stage have a large grass age, and the application of isoproturon for weed control is poor.

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