Can Cornfield Herbicides and Insecticides Be Mixed?

When planting corn, various pests and diseases appear and various weeds grow, so if you want high corn yields, you need to prepare control measures in advance. So can corn herbicides and insecticides be mixed?

1. Can corn herbicides and insecticides be mixed?

Corn herbicides and insecticides can be mixed, but if they are organophosphorus pesticides they cannot be mixed together, because mixing them is very likely to cause phytotoxicity. For example, when using pesticides such as phoxim, chlorpyrifos, dimethoate and dichlorvos, they cannot be mixed, and even within 7 days after spraying corn herbicides, organophosphorus insecticides cannot be used.

2. Which herbicides and insecticides can be mixed?

1. Herbicides, insecticides and fungicides containing these ingredients can be mixed: herbicides such as pyrazosulfuron-ethyl (bensulfuron-methyl), quinclorac, bispyribac-sodium, cyhalofop-butyl and penoxsulam, insecticides such as imidacloprid, pymetrozine and abamectin, and fungicides such as tricyclazole, difenoconazole, hexaconazole and prochloraz can be mixed. Therefore, cyhalofop-butyl can be mixed with herbicides, with little effect on efficacy.

2. Insecticides and fungicides not recommended for mixing with herbicides include: organophosphorus pesticides such as phoxim, triazophos and malathion, and carbamates such as BPMC and carbosulfan. This is especially true of propanil. In recent years, because barnyardgrass resistance has worsened and it is particularly difficult to control, pesticide products containing propanil have gradually increased in use on rice. This pesticide not only cannot be mixed, but within two weeks after use, organophosphorus and carbamate pesticides also cannot be used.

When adding insecticides to herbicides, the principles of pesticide mixing must be followed. Organophosphorus pesticides and propanil absolutely must not be mixed with carbamate insecticides, to avoid phytotoxicity. At the same time, when safety cannot be ensured, first conduct a small-scale test: first see whether the two mixed and diluted products react (precipitation, separation) and whether they are stable, then see whether application causes phytotoxicity.