Precautions for planting pesticides in greenhouses

The appearance of winter greenhouses allows us to eat fresh food in the cold winter. However, the greenhouse can block the cold invasion, but it can not stop the emergence of pests and diseases, so it is also necessary to use some pesticides for prevention and control. This article will introduce the details of the use of pesticides in winter greenhouses.

“In the greenhouse, due to the special ecological environment, it is suitable for all kinds of pests and diseases throughout the year. To effectively control pests and diseases, pesticides must be used scientifically and correctly.” On December 18, Li Mingxi, an agronomist at Nanjiang County Agriculture Bureau, In the vegetable greenhouse of Li Chungui, a farmer from Yushu Village, Dongpu Town, several farmers explained the technology of using pesticides in the greenhouse. Lao Li said that the use of pesticides in the greenhouse should be cautious, pay special attention to -

Correct drug selection

Each pesticide has a certain range of control and prevention and control objects. Before use, it is necessary to understand the performance and use of pesticides. According to the characteristics of the pests in the shed and the correct selection of drugs, it is targeted. In rainy and snowy weather, dust is generally used to reduce the humidity in the shed.

The right medicine

Accurately distinguish between physiological diseases and invasive diseases, confirm the types of pests and diseases that occur, and do the right medicine.

Timely medication

According to the law of occurrence of pests and diseases, pesticides should be applied at the initial stage of pests and diseases, and pests and diseases should be controlled at the stage of spotting to prevent spread. Taking into account the warm and humid environment in the shed, it is not advisable to spray on rainy days or high temperatures to prevent excessive humidity in the shed and reduce the efficacy. Under high temperature conditions, sulfur preparations are used to control melon and vegetable diseases to avoid phytotoxicity.

Even the anti-drug change

After the occurrence of pests and diseases, it is generally necessary to continuously control 2-3 times, each interval of 7-8 days. During the prevention and treatment process, it is necessary to pay attention to the rotation of drugs, and the pesticides of different types and different mechanisms of action should be used interchangeably.

Standardized application

Strictly follow the use concentration and dosage of the drug in the manual. Spraying and spraying in the shed must be comprehensive and uniform. The spray of the drug is generally carried out in the morning to ventilate the temperature inside the shed and reduce the humidity in the shed. Aerosols are generally used after closing the greenhouse in the evening, and attention should be paid to arson.

Safe medication

In the production of vegetables, high-efficiency, low-toxic, low-residue pesticides should be used. It is forbidden to increase the concentration of the liquid at random. The number of times of use should not be too much. The drugs should be used strictly according to the interval to prevent the occurrence of phytotoxicity and reduce pesticide residues. Highly toxic pesticides such as organochlorine, carbofuran and methamidophos are prohibited.

Reasonable mixing

Appropriate fertilizer or foliar micro-fertilizer can be added to the pesticide. But be careful: when mixing, you must first understand the characteristics of various drugs, otherwise, it is counterproductive. For example, the bactericides such as zinc or dexamethasone are easily decomposed in the presence of alkaline substances, and cannot be mixed with the stone sulphur mixture or Bordeaux mixture.

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