Why install anti-insect nets in glass greenhouses?
The temperature in the shed changes with the outside temperature. The general rule is that the higher the temperature outside the shed, the greater the temperature rise in the shed; the lower the temperature outside the shed, the smaller the value of the rise in the shed; the high temperature and low temperature in the big shed appear about 2 hours later than the open field cultivation. On a sunny day, the daily temperature difference is large, and on a rainy day, the daily temperature difference is small. The higher the temperature, the greater the daily temperature difference. The lower the temperature, the smaller the daily temperature difference. According to the temperature change trend of the glass greenhouse and the law of suitable growth and development of mature vegetable varieties, improve the temperature regulation and management in the greenhouse. Generally speaking, seedlings should not be naturally ventilated after transplanting and before slowing down to increase the soft temperature in the shed. In early spring, the temperature and fruits in the greenhouse are weak due to weak sunlight.
It can be seen that it is necessary to install an insect screen in a glass greenhouse, and it can achieve four functions.
1. It can prevent moths reasonably. After covering the insect net, most rabbits can eliminate various pests and diseases, such as cabbage caterpillar, diamondback moth and cloth moth.
2. It can prevent diseases. The virus will have an adverse effect on the software grown in greenhouses, especially spread by budworms. However, the installation of the anti-insect net in the greenhouse cut off the transmission route of the virus, which greatly alleviated the epidemic of virus disease.
3. Adjust the temperature and the humidity of the soft environment. In the hot summer, cover the greenhouse with white insect nets. The temperature in the greenhouse is about the same as the outdoor temperature in the morning, afternoon and evening, but it is 1°C lower than the outdoor temperature in the afternoon and lower than the temperature in autumn and spring. Covering the black insect net can achieve the effect of heat insulation and reasonably relieve the initial frost. In addition, the anti-insect net can prevent some precipitation from falling into the glass greenhouse, reduce the humidity of the field environment and reduce the occurrence of diseases.
4. It has the practical effect of blocking light. In summer, the light intensity is high, and the strong light suppresses the vegetative growth and development of vegetables, especially leafy vegetables and fruits. Insect nets can shading and function to a certain extent. Insect nets are usually black and white, and the common dark gray has a good repellent effect on budding insects. You can choose the color according to the specific application. However, it is recommended to choose dark gray or black when used alone, and white when used with sunscreen, and the number of meshes should be 20-40.
In addition, the following four aspects should be paid attention to when installing insect screens in glass greenhouses.
1. Before planting or transplanting, choose high-temperature stuffy sheds or spray micro-toxic fertilizers to eliminate larvae, pupae and larvae in the soil layer.
2. When planting seedlings, bring the medicine into the shed and choose healthy and disease-free main stems.
3. Strengthen daily management, close the shed door when entering and leaving the greenhouse, and disinfect and sterilize the relevant equipment during farm work to prevent the spread of viruses and ensure the actual application effect of the insect screen.
