In the rural areas, some fruit farmers spray medicines. Due to the lack of common knowledge of pesticides, pesticides are often sprayed on fruit trees, causing a large number of phytotoxics. This not only burns a large number of leaves and shoots of fruit trees, but also causes rust on fruit surfaces, which affects fruit trees. Growing, it reduces the value of the fruit. In order to prevent and reduce this phenomenon from continuing to occur, according to the practice of multi-year medication, several suggestions are provided for your reference:
First, do not blindly use pesticides. When spraying pesticides, according to the different pests and diseases of fruit trees, there are targeted and symptomatic drugs. Some fruit trees have different characteristics of pests and diseases, and they have different resistance to some elements in pesticides. If you follow others, you can use drugs for household use. The use of peony is bound to cause phytotoxicity to fruit trees. For example, stone fruits, kiwifruit are sensitive to trichlorfon and dichlorvos; peach trees are extremely sensitive to phosphonamine; kiwifruit is particularly sensitive to dimethoate and omethoate; and cicada pears are good for Fuxing and Bordeaux in young fruit (before May) It is also very sensitive; the young tissues of grapes, plums and peaches are also very sensitive to the multi-type Bordeaux mixture. If you do not choose and spray blindly when spraying, it will cause phytotoxicity.
Second, avoid the concentration of the drug solution is too large. When dispensing a pharmaceutical solution, it must be dispensed according to the concentration range used on the trademark. Some fruit farmers use a bottle of emulsion, a liquid pesticide, and a matchstick powder. This rough estimation method is inaccurate. The concentration is small, and it is not effective for the treatment of pests and diseases. When the concentration is large, phytotoxicity will occur.
Third, avoid pesticide mismatch. Some pesticides can be mixed and sprayed, but some pesticides should not be mixed. Chemical reactions will occur after mixing; some acidic and alkaline mixtures will reduce the effect of the drug, resulting in sediment and not easy to spray. In particular, some pesticides are mixed and sprayed on trees to cause phytotoxicity. If the mixture of sulphur and sulphur is mixed with Bordeaux mixture, it will increase the water-soluble copper, which is most likely to cause phytotoxicity when sprayed on fruit trees.
Fourth, avoid the spray of Bordeaux before the rain. Before you spray pesticides, you should listen to the weather forecast. If there is rain on the day, do not spray, especially before the rain, spray the Bordeaux mixture. After the rain, the rain washes away the lime on the fruit surface, and the copper sulfate ion left will stimulate the young fruit layer and cause phytotoxicity. Forming a painted apple and losing the value of the commodity.
Fifth, avoid drought, spray under high temperature weather. Generally, the suitable temperature of the pesticide is 20 to 30 degrees, and the maximum temperature is not more than 32 degrees. Before 10 am, it is safer to spray after 3 pm. Although some pesticides such as stone sulphur mixture have high killing power against pests and diseases at high temperatures, the effect is very good, but most pesticides are sprayed under the conditions of too dry weather and high temperature, and the water evaporates quickly, which makes the concentration of pesticides easy to increase. In addition, the fruit tree absorbs the liquid quickly, the physiological function is highly metabolized, and the resistance is relatively reduced, so that phytotoxicity is apt to occur.
First, do not blindly use pesticides. When spraying pesticides, according to the different pests and diseases of fruit trees, there are targeted and symptomatic drugs. Some fruit trees have different characteristics of pests and diseases, and they have different resistance to some elements in pesticides. If you follow others, you can use drugs for household use. The use of peony is bound to cause phytotoxicity to fruit trees. For example, stone fruits, kiwifruit are sensitive to trichlorfon and dichlorvos; peach trees are extremely sensitive to phosphonamine; kiwifruit is particularly sensitive to dimethoate and omethoate; and cicada pears are good for Fuxing and Bordeaux in young fruit (before May) It is also very sensitive; the young tissues of grapes, plums and peaches are also very sensitive to the multi-type Bordeaux mixture. If you do not choose and spray blindly when spraying, it will cause phytotoxicity.
Second, avoid the concentration of the drug solution is too large. When dispensing a pharmaceutical solution, it must be dispensed according to the concentration range used on the trademark. Some fruit farmers use a bottle of emulsion, a liquid pesticide, and a matchstick powder. This rough estimation method is inaccurate. The concentration is small, and it is not effective for the treatment of pests and diseases. When the concentration is large, phytotoxicity will occur.
Third, avoid pesticide mismatch. Some pesticides can be mixed and sprayed, but some pesticides should not be mixed. Chemical reactions will occur after mixing; some acidic and alkaline mixtures will reduce the effect of the drug, resulting in sediment and not easy to spray. In particular, some pesticides are mixed and sprayed on trees to cause phytotoxicity. If the mixture of sulphur and sulphur is mixed with Bordeaux mixture, it will increase the water-soluble copper, which is most likely to cause phytotoxicity when sprayed on fruit trees.
Fourth, avoid the spray of Bordeaux before the rain. Before you spray pesticides, you should listen to the weather forecast. If there is rain on the day, do not spray, especially before the rain, spray the Bordeaux mixture. After the rain, the rain washes away the lime on the fruit surface, and the copper sulfate ion left will stimulate the young fruit layer and cause phytotoxicity. Forming a painted apple and losing the value of the commodity.
Fifth, avoid drought, spray under high temperature weather. Generally, the suitable temperature of the pesticide is 20 to 30 degrees, and the maximum temperature is not more than 32 degrees. Before 10 am, it is safer to spray after 3 pm. Although some pesticides such as stone sulphur mixture have high killing power against pests and diseases at high temperatures, the effect is very good, but most pesticides are sprayed under the conditions of too dry weather and high temperature, and the water evaporates quickly, which makes the concentration of pesticides easy to increase. In addition, the fruit tree absorbs the liquid quickly, the physiological function is highly metabolized, and the resistance is relatively reduced, so that phytotoxicity is apt to occur.
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