How to mix insecticides and pesticides to increase efficacy

When using pesticides, farmers should pay attention to the following five points if they are mixed with pesticide solution. First, synergistic pesticides will enhance each other, especially those pesticides with different insecticidal mechanisms, the synergism is more significant, so as to improve the effect of insecticidal control. How to judge whether the insecticidal mixture is synergistic or not? Usually through a certain method to test the data, and then according to a certain formula to calculate a number, called "co-toxicity coefficient". The co-toxicity coefficient is greater than 1, which means that the greater the number, the higher the effect, and the co-toxicity coefficient is less than 1, indicating that the effect of the mixture of the two insecticides is lower than that of the original alone. Therefore, we usually use the size of the co-toxicity coefficient to judge and show the synergism. For example, when cypermethrin and malathion were mixed in a certain proportion, the co-toxicity coefficient was 219 in cotton bollworm test and 476 in peach aphid test, which indicated that the two insecticides had significant synergistic effect. Some pesticides will break down when exposed to alkaline substances, such as organophosphorus insecticides, and their mixtures will be less effective if they are alkaline, so not all pesticides will necessarily increase efficiency. Some farmers often take several pesticides and use them together at the head of the field. this method of operation is inappropriate and should be used carefully. Second, to complement each other after mixing, the insecticidal speed of the two pesticides is different. If it is mixed reasonably, it can complement each other's advantages. For example, the effect of pyrethroid insecticides is fast, but the insecticidal speed of specific insecticides is slow, and the two mixtures can learn from each other, such as avermectin and cypermethrin, the former is slow, the latter is fast, and the mixture can accelerate the insecticidal effect. Expand the insecticidal spectrum some insecticides have good killing effect on Lepidoptera pests, but have no effect on mites. If mixed with insecticides with strong acaricidal effect or insecticides or acaricides with strong acaricidal effect, Lepidoptera pests and mites can be controlled at the same time. Multi-use of one medicine can save labor and time. Fourth, delaying the resistance of insect pests pyrethroid pesticides are more likely to cause resistance to some pests, such as cotton bollworm, if they are mixed with other pesticides, it can delay the emergence of insect pests or slow down the level of resistance. According to the experimental data, 20% fenvalerate EC (mixed with malathion) and 20% fenvalerate were used to treat cotton bollworm respectively. After 16 generations of continuous treatment, the resistance level of cotton bollworm was determined. It was found that the resistance of cotton bollworm treated with fenvalerate alone was 65.54 times higher than that of cotton bollworm treated with chrysanthemum horse EC, indicating that chrysanthemum horse EC can significantly extend the resistance of cotton bollworm. Fifth, to reduce the cost of control, some pesticides are expensive and some are relatively cheap. if they are mixed reasonably, they not only have many of the above advantages, but also reduce the cost of control. For example: 59% imidacloprid wettable powder, imidacloprid has good insecticidal effect, but the price is expensive. If mixed with cheap insecticidal Dan and used on rice, it can not only control rice planthopper, but also control leafhopper, but also reduce the cost.