During the cultivation of greenhouse vegetables, the occurrence of diseases and pests is also difficult to avoid. Generally, friends who grow large areas often use pesticides to control the occurrence of pests and diseases. The use of pesticides does not pay attention not only can not eliminate the occurrence of pests and diseases, but will produce phytotoxicity, resulting in unnecessary losses, then the winter greenhouse vegetable pesticides nine taboos what is it? First, avoid the use of living water to prepare pesticides because of many impurities in the living water, with its easy to plug the nozzle of the sprayer, but also destroy the liquid suspension and produce precipitation. Second, avoid using well water to prepare pesticides because well water contains more minerals, especially calcium and magnesium. The combination of these minerals and liquid chemicals is prone to chemical reactions, resulting in precipitation and reduced efficacy. Third, avoid arbitrarily increasing the amount of pesticides before the approved production and sales of pesticides, have to go through a rigorous field efficacy trials, and then determine the amount of medication, medication time, number of applications and other actual use data. Therefore, in accordance with the dosage specified in the instructions for use, that can achieve control effect, and increase the amount of drugs not only increase the input, but also make crops produce phytotoxicity, increase pesticide residues in agricultural products, increase environmental pollution. Fourth, bogey arbitrarily increase the amount of excess water will increase the concentration of pesticides. Spraying on the crop leaves only a very small amount of pesticides, which is not enough to kill the pests, and some pesticides even completely fail. Excessive water addition can also result in the loss of pesticides and environmental pollution. Therefore, when formulating pesticides, the amount of water added must be strictly controlled according to their use concentration range. Fifth, avoid unreasonable mixed pesticides Some pesticides mixed application can increase the control effect, reduce the amount of medication, or to achieve the effect of pests and diseases and both the treatment of pests and diseases, and the mixed application of more labor. However, some pesticides cannot be mixed and applied. For example, most of the organophosphorus pesticides will rapidly decompose and fail when they encounter alkaline pesticides or alkaline media. When you need to mix pesticides, be sure to understand the nature of various pesticides, characteristics, find out whether it can be mixed, it is best to consult the relevant technicians and then mixed. 6, bogey in the flowering period spraying pesticide crops flowering period, its young organization, weak resistance, easily prone to phytotoxicity, so spraying must avoid the flowering period. VII. Avoid application of pesticides before crops are harvested. Highly effective and highly toxic pesticides have a residue period of about 60 days. The period of high-efficiency and low-toxicity pesticide residues is about 15 days. Therefore, regardless of food, vegetables, or fruit trees, the use of pesticides should be prohibited before harvest to prevent food poisoning. VIII. Avoid use of expired pesticides at will The pesticide must be used within the warranty period, otherwise it will cause losses. Nine, bogey abuse of pesticides should be based on the type of crops, the object of control and the performance of different pesticides using the corresponding pesticides, so that the right medicine, at the same time to avoid the use of a certain long-term agent.
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