To prevent the occurrence of herbicide phytotoxicity, pay attention to the following ten points:
First, do not use herbicides for sensitive crops
Some crops are extremely sensitive to one or a certain type of herbicide. Don't say direct spraying. Even if the operation is accidentally dropped on the stems of the crops or sprayed with other sprays without the herbicide cleaning, the crops will be given medicine. It causes the plants to stop growing or produce severe distortion, causing the plants to die. Gramineous crops such as rice, wheat, and millet are sensitive to sturdiness, grass cover, etc., which may cause phytotoxicity. They must be avoided or tested to determine the optimum concentration and then used in large areas. Peanuts, melons, soybeans, cotton and rapeseed are extremely sensitive to herbicides such as 24-drip and dimethyltetrachloride.
Second, the use of herbicide methods should be appropriate
There are many different methods of using herbicides. It is necessary to see the instructions on the label and then use it. If the poisonous soil is used to prevent the weeds in the rice fields, if the powder is inadvertently applied to the leaves, it is easy to cause phytotoxicity. Herbicide such as glyphosate can cause serious phytotoxicity if it is contaminated on seeds.
Third, avoid the use of herbicides in the sensitive period of crop growth
The use of herbicides in the germination, germination and heading stages of crops is highly susceptible to phytotoxicity. The application of herbicidal ether during the budding period of rice causes a large amount of pyrolysis.
Fourth, the herbicide should be properly kept to avoid misuse
If the herbicide is not properly stored, it may cause failure, the trademark may fall off or be lost, and the label may not be visible due to moisture. The trademark on the herbicide packaging, such as the performance of the herbicide, the method of use, the composition of the agent, the characteristics of the action, the precautions and the expiration date are all detailed instructions for the use of herbicides. If you do not follow the instructions on the trademark, it may cause phytotoxicity.
5. Do not blindly mix herbicides.
The mixed use of herbicides has strict requirements and cannot be used indiscriminately. Otherwise, it will not only have a synergistic effect, but also cause serious phytotoxicity. Mixed use of propanil and organophosphorus and carbamate pesticides is prone to phytotoxicity. It is not uncommon for the herbicides to be used indiscriminately to cause phytotoxicity.
Sixth, the concentration of medication should be appropriate
It is more common to increase the concentration of herbicides at random. There is a strict requirement for the use concentration of herbicides. Do not increase or decrease the concentration (especially increase the concentration of use), otherwise it will easily cause phytotoxicity or reduce the efficacy. When the wheat field is weeded, the dosage of the superstar will be too large to cause phytotoxicity.
Seven, do not ignore the herbicide residue phytotoxicity
Some herbicides can remain in the soil for a long time to cause phytotoxicity to the lower crops. Residues of wheat weeds in the wheat field often cause post-mortem corn to be damaged, resulting in smaller, thinner, discolored and reduced chlorophyll, shorter plants, and lower seed setting rate.
Eight, the external environment has an impact on the use of herbicides
The external environmental conditions are also closely related to the emergence of herbicide phytotoxicity. Temperature, humidity, wind, light, rain, snow, etc. all affect the efficacy of herbicides. Many herbicides are used at high temperatures and can cause phytotoxicity even when used in accordance with the instructions. In the wheat field, it is easy to produce phytotoxicity if it encounters low temperature, wind and rain and cold current when weeding.
Nine, do not use poor quality herbicides
The herbicide with quality problem is easy to produce phytotoxicity. It must be purchased by a regular manufacturer with complete procedures, good market response and good quality. Do not buy “three no products†without the name of the factory, the site and the date of production. Guaranteed products to avoid phytotoxicity. Wettable powder herbicides, such as processing quality is not in place, large particles, poor wettability, poor suspension, etc., easy to produce precipitation after adding water, affecting the uniformity of the spray and the concentration of the liquid will cause phytotoxicity.
Ten, you must clean the application tool
Tools such as sprayers that have used herbicides must be cleaned in a timely manner before they can be sprayed with other pesticides.
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