The use of herbicides for phytotoxicity is the main cause

The use of herbicides is prone to phytotoxicity. Herbicides can be divided into conduction type and contact type according to different modes of action. The symptoms of conductive herbicides appear late, while the symptoms of contact herbicides appear faster and more urgent. What are the causes of phytotoxicity of herbicides?

First, the nature of the herbicide itself: poor safety, impurities or dosage forms are unqualified, the formula is unreasonable, the content is too high, and illegal hidden components are added.

Second, the impact of environmental conditions: low temperature and rain, windy weather or the application period is not easy to cause phytotoxicity, such as the occurrence of staged low temperature and rainy weather in Heilongjiang Province in May 2014, soybeans, corn fields, low-lying land, sand soil blocks appear A large area of ​​leaching phytotoxicity.

Third, the use of technology: long-lasting herbicides such as imidazolium nicotinic acid, chlorsulfuron-methyl phytotoxicity at low residual concentrations on sensitive crops; excessive use of herbicides, misuse, mixed use and improper selection of additives can also cause phytotoxicity; Improper application period, incorrect application method, poor performance of application equipment, backward spray technology, incomplete spray cleaning, and poor quality of field preparation often cause phytotoxicity.

Fourth, it is the crop factor: the difference in tolerance of crop species to herbicides (such as the different resistance of different varieties of rice to Shakespeare), the sensitivity difference of different growth stages of crops, the quality of crop seedlings and the difference in growth.

5. It is not known about the history of the use of the field: In the survey, it was found that with the large-scale land transfer, the land contractor did not understand the history of the use of the contracted land, and often caused by the use of long residual herbicides by the captain. Residual phytotoxicity.

In summary, more than 70% of the herbicides caused by herbicides are caused by technology. Therefore, it is very important to master the scientific method of using herbicides. If you want to acquire more pesticide knowledge, please pay attention to China Pesticide Net.