We all know that wheat and weeds are sensitive to herbicides at different times, and the safety performance of wheat is different. The performance of various herbicides is different, so it is important to master the application period correctly, especially after wheat jointing. When applying to the young panicle differentiation stage, attention should be paid to the safety of the herbicide to wheat. At present, there are many types of wheat herbicides, most of which require use before wheat jointing, and it is not suitable for medicine after wheat jointing, otherwise it will easily cause different degrees of phytotoxicity.
For example, the toluene mixture can prevent a variety of broad-leaved weeds, using 20% ​​of a solution of 20% dichlorotetrachlorohydrin and 100 ml of 40% bentazon water per acre, spraying 30 kg of water, spraying the time with wheat. It is advisable before the jointing, and the mixture should only be applied to the crops of the rice. Wheat, rice and other gramineous crops are sensitive to metformin at the seedling stage, and gradually increase the resistance after 3-4 leaf stage, the strongest at the end of tillering stage, and the sensitivity to the stage of spike differentiation. Therefore, it is generally required to be in crop 4 Apply from the leaf stage to the jointing stage. 40% chlorpyrifos and 2,4-D butyl ester can not be used after wheat jointing, otherwise it will easily cause phytotoxicity to wheat. If used too late, it will cause wheat to not form. Wheat is applied from jointing to booting. This is the period of vegetative growth and reproductive growth of wheat. It is poor and sensitive to drug resistance. It is easy to produce phytotoxicity, inhibit wheat growth, cause tillering, malformation of wheat, and slow growth. Therefore, it should be applied before jointing, such as wheat jointing and booting stage, which is sensitive to various herbicides such as thrips, dimethyltetrachloride and dicamba. After use, it is easy to cause wheat leaf curl, wheat seedling yellow, growth inhibition, Destruction of panicle differentiation, failure to normal heading or malformation of wheat ears. Application of herbicides containing bensulfuron-methyl in spring wheat field may cause damage to cotton seedlings, soybeans and other crops, and should be applied before winter, and the sowing period of the crops should not be less than 60 days to ensure the crops of the crops. Safety.
In the spring wheat field, we must use herbicides such as thrips and horses to control weeds such as maiping. Isoproturon has good control effect on weeds with small leaf age, and the weeds in wheat jointing stage are older, and the effect of applying isoproturon is poor.
Relatively speaking, the herbicides suitable for controlling broadleaf weeds in wheat fields are safer for wheat seedlings, and the application after wheat jointing generally does not have much influence on wheat growth and development, and These herbicides have a short residual period in the field, and the wheat field does not adversely affect the sputum after application in the spring. Herbicides such as bensulfuron-methyl have a long residual period, and it is generally not suitable for spring wheat after jointing to avoid phytotoxicity to the later crops.
Considering that the application of herbicides may have adverse effects on the jointed wheat, the method of picking can be applied in the field, mainly spraying on the weeds, and it should be noted that even in places with many weeds, Do not blindly repeat the spraying to prevent adverse effects on wheat caused by excessive local application.
Author: Wang Liping
Source: Henan Jixian Agricultural Technology Extension Station
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