In rural areas, some farmers have sprayed pesticides. Due to lack of drug use knowledge, pesticides are frequently applied to fruit trees. A large number of phytotoxicity hazards occur. This not only burns a large number of leaves and shoots of fruit trees, but also causes fruit rust on fruit surfaces, affecting fruit trees. Growth, but also reduces the value of the fruit. In order to prevent and reduce the occurrence of this phenomenon, according to the practice of years of drug use, mention a few suggestions for your reference: First, do not blindly use pesticides. When spraying pesticides, according to the different diseases and pests of fruit trees, targeted, symptomatic medication, some fruit tree diseases and insect pests have different characteristics, the resistance to some elements of pesticides are not the same, if you follow Other people run, people take drugs at home, you The use of herbal medicine is bound to cause phytotoxicity to fruit trees. Such as stone fruits and kiwifruit are very sensitive to trichlorfon and dichlorvos; peach trees are extremely sensitive to phosphine; kiwi fruit is particularly sensitive to dimethoate and omethoate; Dangshansu pear is in the young fruit period (before May) for Fuxing and Bordeaux mixture. It is also very sensitive; the young tissues of grapes, plums, and peaches are also sensitive to Bordeaux fluids in large quantities. If they are not selected and blindly used when spraying, they will cause phytotoxicity. Second, bogey liquid concentration is too large. In the preparation of liquid medicine, must be used according to the scope of use of the mark to match. Some fruit farmers use medicinal bottle caps to measure emulsions, water-based pesticides, and match-powdered-powder pesticides. This rough estimate of the method of preparation is inaccurate. If the concentration is too small, it will be ineffective for treatment of diseases and pests. If the concentration is too large, phytotoxicity will occur. Third, avoid pesticides chaos. Some pesticides can be mixed spray, but some pesticides should not be mixed, chemical reactions occur after mixing; some acidic, alkaline mixture, reducing the efficacy, they produced a precipitate, not easy to spray. In particular, some pesticides are mixed and sprayed on the trees are prone to injury. Such as lime sulfur mixture and Bordeaux mixture, will increase the water-soluble copper, spray on the fruit trees the most prone to phytotoxicity. Fourth, avoid spraying before the rain Bordeaux fluid. Before spraying pesticides, listen to weather forecasts. If there is rain on the day, do not spray, especially before the rain, spray Bordeaux mixture, after rain, rain washed off the lime on the fruit surface, and left behind the copper sulfate ions, will stimulate the young peel layer, resulting in phytotoxicity The formation of a face-faced apple has lost its value. Fifth, avoid drought, spraying under hot weather. The suitable temperature for general pesticides is 20 degrees to 30 degrees, and the maximum temperature does not exceed 32 degrees. Before 10 o'clock in the morning, spraying after 3 o'clock is safer. Although some pesticides such as lime sulfur, etc., have high killing power to pests and diseases at high temperatures, the effect is very good, but most pesticides are sprayed under conditions of excessively dry weather and high temperature, and the water evaporates quickly, making the concentration of pesticides more likely to increase. In addition, fruit trees absorb liquids quickly, their metabolism is strong, and their resistance is relatively reduced. Therefore, it is prone to phytotoxicity.
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