1. The combination of pest control and protection against natural enemies. The types of pests are not different at different times, and the types of natural enemies are also different. To prevent and control pests, we must protect and utilize natural enemies. For example, some species of plant leaf aphid pests are more serious, and leaf-feeding pests are lighter, failing to meet control targets. Therefore, when the drug is used, a special acaricidal agent, such as 15% Dailing EC and 20% suspended colloidal suspension, can be selected, and a broad-spectrum insecticide containing both insects and fleas should not be used. 2. The combination of biological drugs and chemical pesticides. Biological pesticides such as thrips bacillus and beauveria bassiana have relatively strict temperature and humidity requirements. After hitting the targets, they have a physiological and biochemical process in the harmful organisms. The effects are slow, but the efficacy is long, and chemical pesticides are large. Some of them have the functions of knockdown, contact killing, fumigation, internal absorption, stomach poisoning, etc., and have quick results. 3, control period and drug and dose combined. The different developmental stages of a plant, the different types of occurrence of the same species or a certain pest, are not the same in the response to the agents, and the agents and doses used are also different. For example, avermectin has effects on larvae and eggs, but it has no effect on cockroaches and adults. This medicine cannot be used during the pupal stage and adult stage. Another example is the use of lime sulfur (colloidal sulphur suspension agent) for the control of psyllium and conghua. Whitefly, different degrees of Baume degree used in different periods, the general pear white before the use of 3-5 degrees, and after the balloon period will have to use 0.3-0.5 degrees, otherwise it will cause phytotoxicity. 4, drug concentration and temperature and humidity levels and strong sunlight, weak combination. In production, the higher the temperature is, the more severe pests occur. Many farmers use higher concentrations of pesticides, but they still cannot control them. In fact, one of the main reasons that cannot be ruled is that the leaves are large, the second is the thick leaves, and the third is the concealment of pests, which brings certain difficulties to the operation. Regardless of pesticides or fungicides, their control effects are affected by temperature and humidity, and strong and weak sunlight. Under normal circumstances, the higher the temperature, the poorer the stability of pesticides, the faster the decomposition, and the higher the efficacy. At this time, the use 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, the peaches, cherry trees, apricot trees, plums, etc. of the stone fruits are sensitive to dichlorvos and are liable to cause a large number of deciduous fruits. They should be disabled on such plants. 6, in the prevention and control, the specific use of pesticides, alternating use and mixed use.
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