This year, the tomato planting area in summer greenhouses in our province is larger. According to last year's tomato disease incidence and prevention and treatment experience, prevention and treatment of tomato leaf curl virus disease are summarized and summarized for the reference of farmers.
After the infected plants became infected, the yellowing of the upper leaves became smaller and the leaf margins curled up. The leaves shrank and curled, the internodes became shorter, the flowering results were difficult, the fruit type was small, and the ripening was slow. The diseased plants grew slowly and became dwarfed.
Harmful Tomato Leaf Curl Virus Disease is a devastating disease that can develop from seedling to harvest. Tomato leaf curl virus disease began to spread between individuals affected by B. tabaci, and then gradually expanded the scope of the disease, and can be spread through agricultural operations such as pests and farmers in the management of snoring. In summer and autumn of 2006, the disease occurred in a large area in Zhejiang and other provinces. From August to October 2007, the disease occurred in Fugou County of our province. The commonly occurring plots of tomato leaf curl virus disease can reduce production by 50% to 80%. In severe cases, there is no fruit in the whole shed. There is currently a tendency to spread from south to north.
The key to prevent and cure tomato leaf curl virus is to prevent the occurrence and harm of Bemisia tabaci in the early stage of tomato. About one month after seedling and transplanting is the most critical period for the control of Bemisia tabaci. Use 40 to 60 mesh insect-repellent nets when raising seedlings to prevent the entry of whiteflies. At the same time, spray the systemic drug Aketai 2500 times. Before transplanting, use Aketai 2500 times to irrigate the roots. The validity period is 20 months. ~30 days, not only can prevent the occurrence of pre-blight fly whitefly, but also can play the role of strong seedlings; after transplanting, the greenhouse vents should be closed with more than 40 mesh pest control nets, the best hanging pest control board, found In the case of tobacco whitefly, it is necessary to carry out drug control. A better control method is to tightly vent the shed, use fumigant to fumigate it once in the evening, and use Aktai 2500 times for spraying prevention the next day. Once onset, in addition to spraying insecticides to control Bemisia tabaci, it is also necessary to spray the agents that prevent and treat the disease, such as virus A, triazophosazole, phytopathogenic spirit, and Ningnanmycin. High temperature and drought are also the conditions for the occurrence of Tomato Leaf Curl Virus disease. It is well ventilated, hard to pour, and reduces the temperature inside the shed. It can also effectively prevent the occurrence of the disease.
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