The use of pesticides should maximize the efficacy of pesticides. This requires us to master the efficient use of pesticides. The following is a good six-point combination of pesticides.
First, the combination of pest control and protection of natural enemies.
The types of harmful organisms in different periods are different, and the types of natural enemies are also different. While controlling harmful organisms, it is necessary to protect and utilize natural enemies. For example, some plant leaf aphid pests occur more seriously, while leaf-feeding pests occur lighter and fail to reach prevention and control indicators. Therefore, when using the drug, you can choose 15% scented emulsifiable concentrate, 20% sputum sputum , and other specific acaricides . Do not use broad-spectrum insecticides such as Kung Fu and Zhanshi.
Second, the combination of biological pesticides and chemical pesticides.
Biological pesticides such as Bacillus thuringiensis and Beauveria bassiana have strict requirements on temperature and humidity. After hitting the target, there is a physiological and biochemical process in the harmful organisms, which has a slower effect, but the drug lasts for a long time, while the chemical pesticides are large. Some have the effects of knockdown, contact killing, fumigation, systemic absorption, stomach poisoning, etc., and the effect is quicker.
Third, the prevention period is combined with the drug and dose.
The different developmental stages of a plant, the same type or the different occurrences of a certain pest are different in response to the agent, and the dosage and dosage used are not the same. For example, avermectin has an effect on larvae and eggs, but has no effect on cockroaches and adults. It cannot be used in the flood season and adult stage. For example, arsenic mixture (sulphur-sulfur suspension) is used to control pear hibiscus and Kang’s. Whitefly, the different degrees of Baume used in different periods, generally 3-5 degrees before the pear white period, and 0.3-0.5 degrees after the balloon period, otherwise it will cause phytotoxicity.
Fourth, the concentration of the drug is combined with the temperature and humidity, and the strong and weak sunlight.
In production, the higher the temperature, the more severe the pests occur. Many fruit farmers use pesticides at higher concentrations, but they still cannot be cured. In fact, the main reason for the treatment is that the leaves are large, the second is the thick leaf curtain, and the third is the concealment of pests, which brings certain difficulties to the operation. Whether it is an insecticide or a fungicide, its control effect is greatly affected by the temperature and humidity, and the strong and weak sunlight. Under normal circumstances, the higher the temperature, the worse the stability of the pesticide's drug properties, the faster the decomposition, the higher the drug effect, then the concentration should be relatively low. The greater the humidity of the fungicide, the worse the effect, and the relative use concentration should be increased.
5. The choice of pesticides should be combined with the sensitivity of plants to pesticides.
Some plants are sensitive to certain pesticides. For example, peach, cherry, apricot, and plum of stone fruits are sensitive to dichlorvos, which may cause a large number of deciduous fruit and fruit, and should be banned on such plants.
6. Combination of specific use, alternating use and mixed use of pesticides in prevention and control.
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