Spraying pesticides for fruit trees is to prevent and control their pests and diseases, and hope to achieve high-quality and high-yield fruits. In the grass-roots interviews, the reporter found that some farmers often suffer unnecessary losses because they walk into the fruit trees to spray pesticides. In this regard, the reporter interviewed Shi Chunxi, a researcher at the Plant Protection College of the Northwest A&F University, to give authoritative guidance to the majority of growers. Shi Chunxi pointed out that there are many taboos for spraying pesticides. The same applies to spraying pesticides on fruit trees. The majority of growers must firmly grasp the following four points.
First, the high temperature should not be sprayed. At the time of the summer, many fruit trees enter the young fruit period. Shi Chunxi specially reminded the majority of growers that at this stage, in view of the fact that most pesticides should not be sprayed at high temperatures, it is forbidden to choose a medium-high temperature period during spraying. There are three reasons for this. One is that the temperature is too high, the water evaporates quickly, the concentration of the liquid is increased, and the phytotoxicity is highly prone to occur. Second, the temperature is too high, and the decomposition of the pesticide is fast, and all the fruit trees with systemic absorption and infiltration prevent pests and diseases. The effect will be worse; the third is to spray when the temperature is too high, due to the strong volatility of the agent, it is easy to cause operator poisoning.
Second, the concentration of spraying should not be blindly high. Many farmers develop the habit of blindly increasing the concentration of pesticides in the management of fruit trees. It is believed that the greater the concentration of pesticides, the better the effect of controlling pests and diseases. In response to this, Shi Chunxi specifically pointed out that this It is a misunderstanding. He reminded the majority of growers that blindly increasing the amount of pesticides used in agricultural production in order to achieve good control results will often have negative effects. He suggested that the fruit farmers should spray on the pesticides in the summer fruit trees in accordance with the recommended concentration of pesticides to prevent unnecessary damage due to high concentration of phytotoxicity.
Third, it is not advisable to use cold well water and sewage dispensing in the selection of agricultural water. When Chunxi recommends that the majority of growers should not use the water just extracted from the well, one because the fruit trees are at high temperature. When it is raised, the pesticides mixed with the well water are easily stimulated by the fruit trees after spraying. "This reason and people in a very hot situation, it is a reason to take a cold shower and have a cold." Shi Chunxi said that because the well water contains more minerals such as calcium and magnesium, it is easy to chemically react with the liquid to form a sediment. Thereby reducing the efficacy.
In addition, the sewage contains more impurities, impurities will block the nozzle, and will also destroy the stability of the liquid. At the same time, some components in the sewage will also react chemically with the liquid to reduce the efficacy.
Fourth, the selection of pesticides should be cautious In the selection of pesticide types for fruit trees, Shi Chunxi reminds growers to choose pesticides with high efficiency, low toxicity, low residue, safety, stable performance, low irritation and strong environmental performance. Taking the pesticide spraying before apple bagging as an example, it is recommended that the fruit growers who plant apples should avoid some heavy metal containing chemicals in the spraying of pesticides, because this kind of agent is easy to cause fruit rust, and it is best to use water suspension agent. , pesticides such as water emulsions, microemulsions, and water dispersants.
Source: Agricultural Science and Technology News
First, the high temperature should not be sprayed. At the time of the summer, many fruit trees enter the young fruit period. Shi Chunxi specially reminded the majority of growers that at this stage, in view of the fact that most pesticides should not be sprayed at high temperatures, it is forbidden to choose a medium-high temperature period during spraying. There are three reasons for this. One is that the temperature is too high, the water evaporates quickly, the concentration of the liquid is increased, and the phytotoxicity is highly prone to occur. Second, the temperature is too high, and the decomposition of the pesticide is fast, and all the fruit trees with systemic absorption and infiltration prevent pests and diseases. The effect will be worse; the third is to spray when the temperature is too high, due to the strong volatility of the agent, it is easy to cause operator poisoning.
Second, the concentration of spraying should not be blindly high. Many farmers develop the habit of blindly increasing the concentration of pesticides in the management of fruit trees. It is believed that the greater the concentration of pesticides, the better the effect of controlling pests and diseases. In response to this, Shi Chunxi specifically pointed out that this It is a misunderstanding. He reminded the majority of growers that blindly increasing the amount of pesticides used in agricultural production in order to achieve good control results will often have negative effects. He suggested that the fruit farmers should spray on the pesticides in the summer fruit trees in accordance with the recommended concentration of pesticides to prevent unnecessary damage due to high concentration of phytotoxicity.
Third, it is not advisable to use cold well water and sewage dispensing in the selection of agricultural water. When Chunxi recommends that the majority of growers should not use the water just extracted from the well, one because the fruit trees are at high temperature. When it is raised, the pesticides mixed with the well water are easily stimulated by the fruit trees after spraying. "This reason and people in a very hot situation, it is a reason to take a cold shower and have a cold." Shi Chunxi said that because the well water contains more minerals such as calcium and magnesium, it is easy to chemically react with the liquid to form a sediment. Thereby reducing the efficacy.
In addition, the sewage contains more impurities, impurities will block the nozzle, and will also destroy the stability of the liquid. At the same time, some components in the sewage will also react chemically with the liquid to reduce the efficacy.
Fourth, the selection of pesticides should be cautious In the selection of pesticide types for fruit trees, Shi Chunxi reminds growers to choose pesticides with high efficiency, low toxicity, low residue, safety, stable performance, low irritation and strong environmental performance. Taking the pesticide spraying before apple bagging as an example, it is recommended that the fruit growers who plant apples should avoid some heavy metal containing chemicals in the spraying of pesticides, because this kind of agent is easy to cause fruit rust, and it is best to use water suspension agent. , pesticides such as water emulsions, microemulsions, and water dispersants.
Source: Agricultural Science and Technology News
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