Environmental changes before and after film replacement should be prevented early

Recently, it has entered the peak period of film replacement in greenhouses. Especially when some vegetable farmers’ own greenhouse films are damaged in the first half of the year, they are often replaced earlier. After one year of use of the old shed film, the light transmittance is greatly reduced, generally only 60%-70%. After autumn, although the temperature drops rapidly, there are many sunny days and strong sunlight during the day. After replacing the new shed film, the light transmittance of the new film is above 90%. Changes in environmental conditions will inevitably lead to great changes in the occurrence of pests and diseases. Vegetable farmers should pay attention to strengthening management to reduce the probability of problems.

Which pests and diseases will increase after the membrane is changed?

After replacing the canopy film, under the same weather conditions, the intensity of light in the canopy has increased by about half compared to the original light. The instantaneous change in light intensity will inevitably change the environment in the shed. The temperature rises faster, the vegetable transpiration is stronger, and the relative humidity of the air in the shed is lower.

After the virus disease canopy film is replaced, the temperature in the canopy will rise, the light will become stronger, and the humidity will decrease, which is exactly the condition for the occurrence of virus disease. As the outside temperature changes, corn and other crops are harvested, and pests such as aphids and whiteflies outside the shed have also begun to migrate into the shed in large numbers, leading to the last peak period of virus disease transmission. Although the currently planted antiviral varieties have certain resistance, they are not immune. They will happen when conditions are right, and it is difficult to recover after they happen. Therefore, when environmental conditions change, we must strengthen the prevention of viral diseases.

Physiological diseases such as leaf rolling and fruit cracking, as the light becomes stronger and the temperature rises, the transpiration of the leaves will inevitably increase rapidly, which requires the root system to provide more water supply. Once the soil is affected by salinization and compaction, the root system is not strong enough, and the leaves are prone to lack of water, which will aggravate the leaf rolling problem. After replacing the shed film, the temperature in the shed changes faster, the temperature difference is greater, and it is easier to aggravate physiological problems such as fruit cracking. ,

Insect-damage greenhouse film replacement generally chooses sunny weather. At this time, external pests are mostly in the active period, especially many butterfly and moth pests, which often enter the shed when the film is better. Many sheds are planted with leeks, loofah, cabbage, corn and other crops, which often attract a large number of pests, which will aggravate the introduction of pests.

Diseases and insect pests should be prevented early before and after membrane replacement. Whether it is a viral disease or a physiological disease such as leaf rolling and fruit cracking, most of its occurrence is caused by drastic changes in environmental conditions. To reduce the damage, the first measure is to reduce the degree of environmental changes. Pay attention to watering in advance before filming, ensure the humidity in the shed, and apply biological fertilizer, chitin, etc. with water to promote root regeneration, increase root resistance, and ensure sufficient plant nutrients and stronger resistance. After changing the film, pay attention to early ventilation, and appropriate shade to cool down when the light is too strong to avoid drastic changes in environmental conditions.

Secondly, pay attention to spray prevention. You can choose to spray 1500 times of suspended calcium, 750 times of alginic acid, 1000 times of matrine, and 750 times of pyridomycin. Calcium fertilizer, alginic acid, etc. can quickly replenish leaf nutrition, improve cell activity, enhance stress resistance, and reduce virus diseases, leaf rolling and other problems. Matrine can kill insects and reduce the occurrence of viral diseases. Pyridomycin mainly prevents viral diseases.

Finally, after changing the membrane, check the adult butterfly moths in the shed in time. Once found, catch them in time and spray them for control. The butterfly moth pests can choose abamectin, indoxacarb, chlorantraniliprole, etc., and aphids can choose Control of flonicamid, pymetrozine, imidacloprid, etc.

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