Sunlight greenhouse vegetables are in high temperature and high humidity environment, suitable for the occurrence of pests such as whitefly, roundworm, and thrips, and have a great impact on the yield and quality of vegetables.
Pest risk characteristics:
Whitefly: The greenhouse whitefly can occur for 10 generations a year. It mainly harms tomato, cucumber, eggplant and other solanaceous vegetables. It absorbs the sap of vegetables from adults and larvae. The leaves of the damaged vegetables turn green, turn yellow and wilt, and finally cause dead. In addition, adults and larvae can also secrete a large amount of honeydew, contaminate the leaves and fruits of vegetables, and cause the occurrence of coal pollution.
Locust: Aphids are mainly guava, soybean meal and peach aphid. It can take 20-30 generations a year. The locust swarms on the back of leaves and tender stems sucking plant juices with sucking mouthparts, making the leaves yellow, curled, deformed, and even dead. In addition, locusts also spread viral disease and are extremely harmful.
Hummer: Hummer is mainly harmful to melon crops, eggplants, legumes and other vegetables. The larvae are yellow, and the adults are brownish brown. It takes about 15 generations a year. Thrips absorb the leaves of young leaves, shoots, flowers, and young melons. The leaves of the victim were gray and white, and gradually became yellow and white and dry. The damaged young shoots and flowers turned black and faded and hardened and narrowed, which seriously affected the growth.
Red spider: The red spider that takes place in greenhouse vegetables is mainly cinnabarin and two-leafhopper, and it can occur in about 20 generations a year. Severe under high temperature and dry conditions, the temperature exceeds 30 °C, humidity greater than 70% is not conducive to the occurrence of excessive nitrogen fertilizer occurs when the old leaves are heavier. Red spider sucks juice on the back of the leaf with a sucking mouthpart and forms a wire mesh. The victim leaves chlorosis, with white dots and dry leaves.
Control methods:
1. Agricultural Prevention and Control: Dispose of the leaves in the field after the harvest of the vegetables in time, and destroy them in a centralized manner to reduce the number of insect populations. Secondly, during the period of large-scale greenhouse outbreak in March-November, a 30-mesh insect net was installed at the greenhouse vent to prevent pests from entering the greenhouse.
2. Physical control: Using the phototaxis of pests, swatches can be hung in the greenhouse to trap and kill pests. For example, smearing engine oil on a yellow plate can trap whitefly. The locusts are evasive to silver-gray, and they can hang silver-gray strips around the vents in greenhouses or in the greenhouses to enter the passageways, which can achieve the purpose of repelling locusts.
3. Chemical control: 10% imidacloprid spray can effectively prevent the damage of greenhouse whitefly and aphids, and it can also use acetamiprid and other agents to control whitefly and aphids. The control of thrips can be controlled by spraying 10% of imidacloprid wettable powder 1500 times, and it can also be controlled by high-effective cypermethrin or Aktai. It can be used to control red spiders with 1.8% Aconazole EC 2000 times or edestin EC 3000 times, spray once every 7-10 days, and spray 2-3 times.
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