When using pesticides, farmers should pay attention to the following five points if they are mixed with pesticides.
First, the synergistic effect of pesticides will increase mutual efficiency, especially those pesticides with different mechanisms of insecticidal action, the synergy is more significant, thus improving the insecticidal control effect. How to judge the synergistic effect of insecticide mixture? Usually the data obtained through a certain method of testing, and then calculated according to a certain formula, calculate a number, called "co-toxic coefficient." The co-toxicity coefficient is greater than 1, indicating the synergy. The larger the number, the higher the effect, and the co-toxicity coefficient is less than 1, indicating that the effect is reduced, indicating that the mixture of the two insecticides is lower than the original use alone. Therefore, everyone usually uses the size of the co-toxicity coefficient to judge and demonstrate synergy. For example, beta-cypermethrin and malathion are mixed in a certain proportion and used in the cotton bollworm test. The co-toxicity coefficient is 219. The co-toxicity coefficient is 476, which indicates that the two insecticides are mixed. There is a significant synergy. Some insecticides will decompose in the presence of alkaline substances, such as organophosphorus pesticides. If the agents mixed with them are alkaline, the effect will be reduced. Therefore, not all pesticides will be synergistic. Some farmers' friends often take several insecticides and use them together in the field. This method of operation is not appropriate and should be used.
Second, after compounding, it is necessary to complement each other. The insecticide speed of the two insecticides is different. If properly mixed, you can complement each other. For example, pyrethroid insecticides act quickly, while specific insecticides are slow to kill insects. The two compounds can be used to complement each other. For example, avermectin is mixed with beta-cypermethrin. The former is slow to kill insects, and the latter is insecticidal. Fast, compounding can accelerate the insecticidal effect.
Third, expand the insecticidal spectrum Some pesticides have a good killing effect on lepidopteran pests, but they are not effective against mites. If it is mixed with a strong killing insecticide or a strong acaricide or acaricide, it can simultaneously control lepidopteran pests and mites. A multi-purpose medicine can save labor and time.
4. Delaying the resistance of pests Pyrethroid pesticides are more likely to cause resistance to certain pests, such as cotton bollworms. If they are mixed with other insecticides, the pesticidal properties of the pests may be delayed or resistant to 5 levels. Low and slow. According to the experimental data, the cotton bollworm was treated with 20% chrysanthemum emulsifiable concentrate (monotherapy of fenvalerate and malathion) and 20% fenvalerate, and the resistance level was determined after 16 generations of continuous treatment. It was found that the resistance of cotton worms with fenvalerate alone was 65.54 times higher than that of cotton worms treated with daisy emulsifiable concentrate, indicating that daisy emulsifiable concentrate significantly inhibited the resistance of cotton bollworm.
Fifth, reduce the cost of prevention Some pesticides have higher prices, some are cheaper. If they are properly mixed, not only have many of the above advantages, but also reduce the cost of prevention. For example: 59% pyridoxan wettable powder, imidacloprid insecticidal effect is good, but the price is expensive, if mixed with cheap insecticide, used on rice, not only can control rice planthopper, but also control leafhopper, It also reduces costs.
First, the synergistic effect of pesticides will increase mutual efficiency, especially those pesticides with different mechanisms of insecticidal action, the synergy is more significant, thus improving the insecticidal control effect. How to judge the synergistic effect of insecticide mixture? Usually the data obtained through a certain method of testing, and then calculated according to a certain formula, calculate a number, called "co-toxic coefficient." The co-toxicity coefficient is greater than 1, indicating the synergy. The larger the number, the higher the effect, and the co-toxicity coefficient is less than 1, indicating that the effect is reduced, indicating that the mixture of the two insecticides is lower than the original use alone. Therefore, everyone usually uses the size of the co-toxicity coefficient to judge and demonstrate synergy. For example, beta-cypermethrin and malathion are mixed in a certain proportion and used in the cotton bollworm test. The co-toxicity coefficient is 219. The co-toxicity coefficient is 476, which indicates that the two insecticides are mixed. There is a significant synergy. Some insecticides will decompose in the presence of alkaline substances, such as organophosphorus pesticides. If the agents mixed with them are alkaline, the effect will be reduced. Therefore, not all pesticides will be synergistic. Some farmers' friends often take several insecticides and use them together in the field. This method of operation is not appropriate and should be used.
Second, after compounding, it is necessary to complement each other. The insecticide speed of the two insecticides is different. If properly mixed, you can complement each other. For example, pyrethroid insecticides act quickly, while specific insecticides are slow to kill insects. The two compounds can be used to complement each other. For example, avermectin is mixed with beta-cypermethrin. The former is slow to kill insects, and the latter is insecticidal. Fast, compounding can accelerate the insecticidal effect.
Third, expand the insecticidal spectrum Some pesticides have a good killing effect on lepidopteran pests, but they are not effective against mites. If it is mixed with a strong killing insecticide or a strong acaricide or acaricide, it can simultaneously control lepidopteran pests and mites. A multi-purpose medicine can save labor and time.
4. Delaying the resistance of pests Pyrethroid pesticides are more likely to cause resistance to certain pests, such as cotton bollworms. If they are mixed with other insecticides, the pesticidal properties of the pests may be delayed or resistant to 5 levels. Low and slow. According to the experimental data, the cotton bollworm was treated with 20% chrysanthemum emulsifiable concentrate (monotherapy of fenvalerate and malathion) and 20% fenvalerate, and the resistance level was determined after 16 generations of continuous treatment. It was found that the resistance of cotton worms with fenvalerate alone was 65.54 times higher than that of cotton worms treated with daisy emulsifiable concentrate, indicating that daisy emulsifiable concentrate significantly inhibited the resistance of cotton bollworm.
Fifth, reduce the cost of prevention Some pesticides have higher prices, some are cheaper. If they are properly mixed, not only have many of the above advantages, but also reduce the cost of prevention. For example: 59% pyridoxan wettable powder, imidacloprid insecticidal effect is good, but the price is expensive, if mixed with cheap insecticide, used on rice, not only can control rice planthopper, but also control leafhopper, It also reduces costs.
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