Pesticides come with varying medicinal properties, different control objectives, and sometimes mixed purposes, which means the mixing methods can vary significantly. According to the Chinese Pesticide Network, there are two main approaches when it comes to blending pesticides: "reduction" when targeting the same pest or disease, and "individual dosing" when dealing with multiple targets.
The "reduction" method is commonly used when the target is the same. Since both pesticides are aimed at the same issue, they can work together in a complementary way. In practice, this usually follows an equalization rule—when two pesticides are mixed, each is used at half the original concentration. For example, when controlling gray mold on sweet peppers, a 50% carbendazim WP diluted 1000 times and a 50% chlorhexidine WP diluted 2000 times can be combined. The final mixture would use half the original dose of each (i.e., 500 times for carbendazim and 1000 times for chlorhexidine). Another example involves controlling Spodoptera litura larvae, where 5% emulsifiable concentrate is applied at 2000 times dilution, with 20 ml per acre. In this case, the dosage is also halved for each component. When dealing with weeds in spring wheat fields, a mixture of 2% chlorsulfuron suspension and 10% bensulfuron-methyl WP is often used, following the same principle. However, if the two pesticides show strong synergy, the dosage can be reduced even further.
On the other hand, the "individual dosing" approach is used when targeting different pests or diseases. This is especially common when multiple issues appear simultaneously. Each pesticide is applied at its own optimal concentration to ensure effective control. For instance, when managing both downy mildew and bacterial angular spot on cucumbers, a 40% ethyl phosphine aluminum wettable powder diluted 250 times is mixed with a 50% succinic acid copper wettable powder diluted 500 times. Although these are both fungal-related issues, they involve different pathogens, so each must be treated separately. Similarly, after apple flowering, a mix of powdery mildew, leaf spot, and aphids may be controlled using 15% rust WP diluted 1000–1500 times, 10% oxymycin WP diluted 1500 times, and 1.8% avermectin diluted 5000 times. In such cases, each ingredient is used at its proper strength.
The Chinese Pesticide Network reminds users that when mixing multiple pesticides, it's essential to follow the correct ratios and application guidelines to ensure both safety and effectiveness. Always check label instructions and consult experts if unsure.
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