Can post-emergence corn herbicides be mixed with insecticides?

Many growers, for the sake of convenience, mix post-emergence corn herbicides with insecticides, but the results are often poor. Can post-emergence corn herbicides be mixed with insecticides?

1. Can post-emergence corn herbicides be mixed with insecticides?

The two are not suitable for mixing. Insecticides and post-emergence herbicides have different ingredients, and they are applied to different places, so they are not suitable for mixing. Mixing them may cause phytotoxicity, so it is best to use them separately.

2. What kinds of pesticides can be mixed?

1.1. No adverse chemical reaction occurs between the mixed varieties (such as hydrolysis, alkaline hydrolysis, acid hydrolysis or oxidation-reduction reactions, etc.), ensuring normal efficacy or synergism, and it also does not affect the physical properties of the pesticide (such as emulsification and reduced suspension rate, etc.). For example, most organophosphorus insecticides cannot be mixed with Bordeaux mixture, lime sulfur mixture, etc.; powders cannot be mixed with wettable powders or soluble powders.

2. After different varieties are mixed, they must not cause phytotoxicity to crops. For example, after organophosphorus insecticides are mixed with propanil, they will cause phytotoxicity to rice, and mixing Bordeaux mixture with lime sulfur mixture can easily cause phytotoxicity to crops.

3. After pesticides are mixed, toxicity does not increase, ensuring safety to humans and livestock.

4. Mixing must be reasonable. This includes reasonable matching among the same type, such as controlling grass weeds in soybean fields; using sethoxydim or haloxyfop alone can achieve control, and then mixing the two, although feasible in terms of pesticide stability, is an unreasonable mix, as it neither increases efficacy nor broadens the control spectrum, so the mixed use is unnecessary. Pesticide mixing is intended to save labor and time and improve economic benefits. If the cost increases greatly after making a mixed formulation, it is unacceptable.

5. Pay attention to antagonism among pesticide varieties to ensure the effect of mixing. For example, mixing bentazone with sethoxydim reduces the control effect on grass weeds due to antagonism.

It is best not to mix post-emergence corn herbicides with insecticides, so as to avoid phytotoxicity, and it is best to use them separately.