In the pest control of fruit trees, some fruit growers often give pesticides improperly because of lack of knowledge about the use of pesticides, resulting in phytotoxicity, causing burns to the leaves, loss of fruit quality, falling flowers, falling fruit, and even the death of whole plants. Affected the development of fruit trees, reducing the value of the fruit of the commodity. In order to avoid and eliminate the emergence of such signs, the following points should be noted:

1. Avoid using any tree species. For example, stone fruit trees are very sensitive to trichlorfon and dichlorvos; peach trees are extremely sensitive to phosphine; Dangshan pears are also sensitive to Fuxing and Bordeaux mixture in the young fruit period (before May). Peaches, apricots, plums, and other stone fruit trees can not be used in the development season Bordeaux mixture, the grape must use lime half-quantity, apples with multiple formulas, pears with equal amounts. If the spray is not based on the type of tree chaotic anthers, it will form a phytotoxicity.

2, bogey fruit spray large concentrations of inorganic phosphorus pesticides. In the usual young fruit period, the concentration of inorganic phosphorous sprayed in the city produces different levels of phytotoxicity. If it is necessary to spray inorganic phosphorus pesticides, the preparation of the concentration is not significant, such as spray 50% parathion preparation concentration not less than 3000 times; 40% of the concentration of omethoate preparation is not less than 2000 times and so on.

3, do not consciously increase the concentration of pharmaceuticals. When formulating the drug solution, it must be severely matched to the product's interpreted concentration scale. Some fruit farmers use bottle cap emulsions, water-based pesticides, and ocean-fired powdered pesticides. The preparation methods for such crops are forbidden. The concentration of the small, effective treatment of pests and diseases, the concentration, it will produce phytotoxicity.

4, do not consciously mix pesticides. Some pesticides can be confused with sprays, but some pesticides should not be confused. If the lime sulfur is mixed with Bordeaux mixture, water-soluble copper will be added, and spraying on the fruit trees will most easily cause injury. After sprayed with lime sulfur, the spray can be sprayed for 7-10 days, and sprayed with the Bordeaux mixture should be stopped within 20-30 days. Bordeaux mixture is also not used in combination with fungicides and thirams. Mixing with inorganic phosphorus pesticides should also be used with them.

5. Do not spray Bordeaux fluid before rain. Before spraying pesticides as usual, listen to the weather forecast. If there is rain on the day, do not spray, especially before the rain, Bordeaux spray, after the heavy concentration of copper ions after the rain, there will be phytotoxicity. In the dry season, the Golden Delicious apples often produce a large amount of fruit rust with Bordeaux mixture.

6, avoid drought, spraying under low-temperature weather. The normal temperature for pesticides is 20-30°C, and the minimum temperature does not exceed 32°C. Before 10 o'clock in the morning, 3 o'clock warfare is quieter in the future. Although some pesticides such as lime sulfur and dimethoate, etc., in the low temperature of the pest damage, and the consequences are good. However, most pesticides sprayed fruit trees under conditions where the weather was too dry and the temperature was too high, because the temperature was high, the water evaporated quickly, the concentration of pesticides was easily increased, and the fruit trees received the liquid quickly, resulting in new strengths and resistance. Absolute decline, so that it easily produces phytotoxicity.

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