In late spring and early summer, as the temperature increased, the greenhouse insulation was no longer pulled, and the temperature difference between the day and night in the shed increased greatly. In recent days, the sunny day has strong light and the maximum temperature in the shed is generally above 35 ℃. At night, the insulation is no longer covered, and the temperature in the shed will drop to below 15 ℃, and the temperature difference between day and night is above 20 ℃. The large temperature difference between day and night leads to excessive humidity and dew at night in the shed, which creates good conditions for the occurrence of bacterial diseases. In this case, to improve the environment in the shed and reduce the occurrence of diseases, you need to start with the following points:

Improve ventilation measures and reduce humidity in the shed

After the minimum night temperature outside reaches above 10 ° C, the vents at night may not be completely closed, and small vents of about 5 cm should be kept at intervals to help reduce the excessive humidity in the shed after the night temperature is reduced. If the night temperature is still low, you can put down the insulation quilt, but do not close the vents, which helps to discharge moisture and reduce dew.

Pay attention to pruning and branching to reduce wounds

Cucumber picking leaves, falling vines, muskmelon twigs, hanging vines, eggplant leaf picking, fruit picking and other operations, the personnel continue to move, will leave a lot of wounds on the vegetables. The more wounds and more dew are the main factors for the outbreak of bacterial diseases. When carrying out agricultural operations, vegetable farmers should avoid the time when the morning dew is heavy and not yet dry, to avoid the spread of bacteria.

Early spraying of biological fungi for prevention

The environment with high temperature, high humidity and dew is beneficial to the reproduction of biological bacteria. It is recommended that vegetable farmers spray Pseudomonas fluorescens, Bacillus polymyxa, chitosan, etc. in advance to focus on preventing bacterial diseases; Wait. Before the rainy day, spray the biological fungicide in advance, the disease prevention effect is outstanding, and the duration is longer, which is difficult to compare with chemical agents.

Supplement nutrition and improve resistance

Unbalanced nutrition is an important factor that causes the resistance of vegetables to decline. After entering the shed on a cloudy day, if there are a lot of water-like spots on the back of the vegetable leaves, it means that the cells are weak and the nutrition is uneven. Applying suspended calcium, monosilicic acid, etc. in advance helps to cultivate strong trees, increase the thickness of the stalk epidermis, and enhance disease resistance.

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Sourcing services are a type of business activity in which one company (usually a supply chain management company or professional purchasing agent) accepts a commission from another company or individual to carry out purchasing activities on their behalf. This service mainly includes the following aspects:
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