1. Prevention and control of the initial occurrence of pests and diseases
The occurrence of pests and diseases in fruit trees is divided into three stages: initial growth, high incidence, and low incidence. Diseases should be controlled before the initial stage of development or the epidemic center has not yet spread to the epidemic; pests should be controlled before the occurrence of a small amount of disease and have not yet started to feed a large number of foods, so that pests can be controlled at the initial stage.
2. The most weak stage of pest life activity prevention and control
Generally, pests should be controlled at the young stage before the third instar. At this time, the body is small, the body wall is thin, the food intake is small, activities are concentrated, the drug resistance is low, and the drug killing effect is good.
3. Pest prevention before hidden dangers
Pests are sprayed on the stems, flowers, fruits, and leaves of fruit trees to prevent and control them. They are easily touched and killed. Once infested, the control is difficult or ineffective. Therefore, pests of leaf roller and leaf miner should be wounded or dipped Prevention and treatment before the leaves; pests should be controlled before entering the fruit; pests should be controlled before and after the invasion.
4. Prevention and control within prevention and control indicators
If the fruit rate of peach ovules reaches 1%, when the leaf caterpillars are eaten at 5%, when the aphids have 5-6 heads per leaf, or if there are 8-10 groups per 100 shoots, Red spiders are the most economical and effective when controlling 2-3 leaves per leaf.
5. Choose the weather and time
To prevent or treat diseases and pests of fruit trees, it is not appropriate to spray drugs in windy weather so as not to affect the control effect. Protective fungicides should be sprayed before the rain and the systemic fungicide should be sprayed after rain. The specific time should avoid high temperature and low temperature. When the temperature is high, the insecticidal effect is good but drug poisoning should be prevented. If the dew is not sprayed dry, it is easy to burn the leaves.
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