The use of insect-proof nets in vegetable production has many benefits. The function, selection and usage of the anti insect net for agriculture are introduced as follows.
1. Insect prevention. After the insect protection net is covered in the vegetable field, it can basically avoid the damage of various pests such as cabbage caterpillar, diamondback moth, cabbage armyworm, litters, beetles, aphids, etc.
2. disease prevention. Virus disease is a catastrophic disease of many vegetables, mainly transmitted by insects, especially aphids. Because the insect-proof net cuts off the route of pest transmission, the incidence of virus diseases is greatly reduced, and the control effect is about 80%.
3. Adjust the temperature, soil temperature and humidity. The test shows that in hot summer, the temperature in the greenhouse in the morning and evening is the same as that in the open field, while the temperature in the sunny day is about 1 ℃ lower than that in the open field; in early spring from March to April, the temperature in the greenhouse after the insect net is 1 ℃ ~ 2 ℃ higher than that in the open field, and the temperature in the 5cm is 0.5 ℃ ~ 1 ℃ higher than that in the open field; insect-proof nets can prevent some rainwater from falling into the shed, reduce field humidity, reduce morbidity, and reduce water evaporation in the shed on sunny days.
4. Block strong light. In summer, the light intensity is high, and the strong light will inhibit the vegetative growth of vegetables, especially leafy vegetables, and the insect-proof net can play a certain role in shading and preventing direct light.
The insect-proof net is available in black, white, silver gray and other colors. You can choose the net color according to your needs. When used alone, silver gray (silver gray has a better rejection effect on aphids) or black should be selected. When used in conjunction with the sunshade net, it is advisable to choose white, and the mesh is generally 20~40 mesh.
1. Greenhouse coverage. The insect-proof net is directly covered on the scaffolding, and the surroundings are tightly compacted with soil or bricks. The top pressure line should be tightened to prevent strong winds from lifting. At ordinary times, you should close the door at hand to prevent butterflies and moths from flying into the shed to lay eggs.
2. Small arch cover. Cover the insect-proof net on the arch frame of the small arch shed, and water it directly on the net after watering, and do not uncover the net until harvesting, and implement fully enclosed coverage.
cultivated vegetables in summer and autumn are generally covered with insect-proof nets. Vegetables with a long growth period, high stalks or need to be erected need to be cultivated in large and medium sheds for easy management and harvesting. Fast-growing leafy vegetables cultivated in summer and autumn can be cultivated in small arched sheds because of their short growth period and relatively concentrated harvest. For off-season cultivation in late autumn, late winter and early spring, insect-proof nets can be set at the air outlet of the greenhouse and pressed tightly with film pressing lines.
1. Before sowing or planting, use high-temperature stuffy shed or spraying low-toxic pesticides to kill parasite pupae and larvae in the soil.
2. When planting seedlings, it is best to bring medicine into the shed and select robust plants without diseases and insect pests.
3. Strengthen the daily management, into and out of the greenhouse to close the door, in the agricultural operation to disinfect the relevant utensils, to prevent the virus from the wound into the use of insect net.
4. Frequently check whether the insect-proof net has torn openings (especially those with long service life). Once found, it should be repaired in time to ensure that there is no pest invasion in the shed.