Pesticides come with varied medicinal properties, different control objectives, and sometimes multiple purposes, which means the mixing methods can differ significantly. The Chinese Pesticide Network explains that when targeting the same pest or disease, a "reduction" approach is often used, while for different targets, a "varied amount" method is more appropriate.
When dealing with the same target, combining pesticides is a common practice. Since both pesticides aim to tackle the same issue, they can work together effectively. In such cases, the standard mixing rule is usually equalization—meaning each pesticide is used at half the original concentration when two are mixed, and proportionally adjusted when three or more are involved. For example, when controlling gray mold in sweet peppers, a 50% carbendazim WP diluted at 1000 times and a 50% chlorhexidine WP diluted at 2000 times can be mixed. The actual preparation involves using half the original concentration of each (i.e., 500 times for carbendazim and 1000 times for chlorhexidine). Similarly, when managing Spodoptera litura larvae, a 5% emulsifiable concentrate may be applied at 2000 times dilution, with 75 liters per acre and 20 ml of 5% cypermethrin. Here, the mixture follows the halving principle, with one pesticide diluted at 1000–1500 times and the other at 3000 times.
In some cases, if there's a clear synergistic effect, the dosage can even be reduced further. When targeting different pests or diseases, however, it’s important to maintain individual concentrations to ensure effective control. This is referred to as the "varied amount" approach. For instance, when treating both fungal downy mildew and bacterial angular spot on cucumbers, a mixture of 40% ethyl phosphine aluminum wettable powder (250 times) and 50% succinic acid copper wettable powder (500 times) is commonly used. Although these are both plant diseases, they are caused by different pathogens, so each component must be applied at its own recommended rate.
Another example involves apple trees after flowering, where powdery mildew, leaf spot, and aphids may appear together. A combination of 15% rust WP (1000–1500 times), 10% oxymycin WP (1500 times), and 1.8% avermectin (5000 times) is often used. Each ingredient is applied at its specific dilution rate to address the respective pest or disease.
The Chinese Pesticide Network reminds users that when mixing multiple pesticides, it's essential to follow the "each amount" rule, ensuring that each active ingredient is used in the correct quantity for its intended purpose. Proper mixing not only enhances effectiveness but also helps prevent resistance and minimizes the risk of crop damage. Always read the label carefully and consult local agricultural guidelines before applying any pesticide mixtures.
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