Prevention of virus disease arch shed insect nets to be set early
In 2009, the tomato TY viral disease that began in the spring was rolled out in Shouguang, Qingzhou and other places. A large number of greenhouse tomatoes were pulled out in advance, causing huge losses. Pepper, cucumber and other crops, the virus disease is also an important loss caused by the disease. Whether this year's virus disease will be a large-scale outbreak will not be sensible to anyone. However, peasants can't afford gambling. Therefore, prevention must be strengthened from the outset. What is the most effective way to prevent viruses? Antiviral species, but in the case of immature or no antiviral varieties, the most effective measure is to cut off the transmission of viral diseases. Viruses must be living parasites, and they must be transmitted through long distances only through seedlings or pests. In greenhouse conditions, aphids, whiteflies and other transmission pests are the main means of transmitting viral diseases. Tomato TY can only be transmitted through the whiteflies. The period of serious transmission of pests and pests is also a period of severe outbreaks of vegetable virus in greenhouses. For example, before and after the wheat harvest, it was the first time that the virus disease concentrated outbreak. Therefore, in order to avoid a large-scale outbreak of vegetable virus disease this year, we must prevent transmission of poisonous pests. In April and May, outside temperatures rose, weeds, trees, and wheat germinated, and locusts and whiteflies started to follow. Small pests such as aphids and whiteflies have limited flying ability. Most of them only move within two meters of the ground. Especially in the recent period, the hosts such as wheat and weeds are relatively low and can fly to more than two meters through the upper vents. There are few locusts and whiteflies entering the shed. After entering the summer in May, the light is getting stronger, the temperature is getting higher, and it is difficult to control the temperature in the shed from the top alone. It is necessary to match the bottom wind. At this time, it is also the easiest period for poisonous pests to move into the shed outside the shed. Therefore, to prevent worms, whiteflies and other poisonous pests from moving into the sheds, it is necessary to apply a good insect-proof net before the wind is released. The insect sheds are provided with insect-proof nets. The emphasis is on both sides. It must be ensured that the insect-proof nets are tightly fitted, the upper part is close to the film, and the lower part is close to the ground, there is no gap, so as not to transmit poisonous insects. In addition, we must also do a good job of weeding around the shed to reduce the host of locusts, whiteflies and other pests to prevent pests from staying and staying around the shed. In this way, it is possible to completely “encourage the enemy outside the country†to minimize the occurrence of viral diseases. From now on, set up a yellow armyworm board in the shed and observe it once a day to see if there are poisonous pests. Once pests are found, insecticides, such as acetamiprid, buprofezin, avermectin, etc., must be promptly sprayed to prevent pests from migrating into the shed and breeding harms.
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