Vegetable Insect Net Coverage Cultivation Supporting Measures

Insect net cultivation is widely used in urban suburban areas for growing leafy vegetables. This method helps reduce the impact of adverse conditions such as high temperatures, heavy rain, and pests, especially during summer and autumn, thereby improving vegetable quality. To ensure its effectiveness, several key measures must be implemented. First, field cleaning is essential. Before sowing, remove plant residues and weeds to minimize pest populations. Also, clear weeds inside and around the net structure to prevent pests from laying eggs that could hatch and damage crops. Second, soil disinfection should be carried out before planting. After tilling the soil, spray it with chlorpyrifos or dichlorvos to eliminate any pests present in the ground. Third, choosing the right variety is important. Vegetables like cabbage, spinach, lettuce, radish, and leeks are more prone to pests and diseases in summer and autumn, making them ideal candidates for insect net cultivation. Due to higher humidity and temperature inside the net house, select varieties that are heat- and disease-resistant. It’s best to grow the same variety together and at the same time to simplify management and reduce the risk of pest and disease spread. Fourth, proper water drainage is crucial. In hot and humid conditions, excessive moisture can promote pest and disease development. In areas with high rainfall or a high water table, deep trenches should be dug to ensure good drainage and maintain optimal humidity levels. Fifth, full coverage is recommended. Although insect nets are mainly used in summer and autumn, in southern regions where winters are milder, covering the net house year-round helps protect against pests in other seasons and also provides frost protection in spring and autumn. Sixth, effective shed management is necessary. The structure should be strong, with sturdy posts to withstand wind and snow. A typical net house covers 1335–2670 square meters to avoid large-scale damage from strong winds. Always keep doors closed, regularly check for holes in the net, and repair them promptly. Maintain a gap between plants and the net to prevent pests from laying eggs on leaves, which could attract more pests. Clean the net regularly to prevent larvae from entering. Lastly, integrated pest management is key. Use pesticides only when necessary and target the most effective timing. Prefer biopesticides such as Bt, avermectin, and pyrethroids, and use chemical pesticides selectively, including some organophosphorus compounds. Strictly follow safety intervals. Natural predators like ladybugs, lacewings, and parasitic wasps can also be introduced to control pest populations effectively within the net house.

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