Can herbicides and pesticides be mixed? When is the herbicide spraying effective?

Herbicide and pesticide can be mixed, but the principle of mixing pesticides should be followed. Mixing principl

Can herbicides and pesticides be mixed? When is the herbicide spraying effective?

Herbicide and pesticide can be mixed, but the principle of mixing pesticides should be followed. Mixing principle: 1. After mixing the two, hydrolysis, alkali hydrolysis, acid hydrolysis or redox reaction will not occur. 2. After mixing the two, the physical properties of the liquid medicine will not be affected, that is, there will be no stratification, precipitation, emulsification, suspension rate reduction and other phenomena. 3. When they are mixed, they will not increase toxicity and produce phytotoxicity. 4. Organophosphorus and organosulfur pesticides cannot be mixed with pesticides containing copper preparations.

1. Can herbicides and pesticides be mixed?

Herbicide and pesticide can be mixed, but the principle of mixing pesticides should be followed. Details are as follows:

1, and no hydrolysis, alkali hydrolysis, acid hydrolysis or redox reaction will occur after mixing them, which can ensure the normal drug effect. For example, in alkaline environment, carbamate and pyrethroid vinegar pesticides are prone to hydrolysis reaction, thus destroying the original structure and reducing the efficacy.

2. The physical properties of the liquid medicine (stratification, precipitation, emulsification and suspension rate reduction) will not be affected after mixing the two. For example, Bordeaux mixture can not be mixed with stone sulfur mixture, otherwise copper sulfide precipitation will occur.

3. When they are mixed, they will not increase toxicity and produce phytotoxicity. For example, dichlorvos and butachlor cannot be mixed with organophosphorus and carbamate pesticides.

4. Organophosphorus and organosulfur pesticides cannot be mixed with pesticides containing copper preparations. For example, 2,4-salt-dropping herbicide cannot be mixed with copper preparation, otherwise it will be complexed with copper ions and lose its activity.

2. When is herbicide spraying effective?

1. If the temperature is low in winter, spring, autumn and other seasons, you usually choose to take the medicine from 10 morning to 3 pm, when the temperature is more suitable.

2. If the temperature is high in summer, it is usually taken before 9- 10 in the morning or after 4-5 in the afternoon. If you take medicine at high temperature at noon, on the one hand, the water in the liquid medicine will evaporate quickly, which will easily lead to the increase of the concentration of the liquid medicine, thus causing phytotoxicity. On the other hand, when the temperature is too high, the stomata on weed leaves close and the absorption rate of liquid medicine decreases.

3. Herbicide spraying is generally carried out on sunny or cloudy days, requiring no wind or breeze (wind force below level 3), temperature above 10℃, and no dew on the leaves.