Method for preventing and treating tobacco target leaf spot

Abstract

The invention discloses a method for preventing and treating thanatephorus cucumeris. The method comprises the following steps of 1) conducting deep ploughing and upturned soil sunning on cultivated land from the late winter to the early spring, removing diseased plant residues and surrounding weeds in the cultivated land, uniformly spreading lime on the surface of the cultivated land after upturned soil sunning, harrowing the earth within 3 days, and continuously sunning upturned soil for more than 15 days after harrowing; and (2) after tobacco seedlings are transplanted, alternately spraying the following agents from the beginning of generation of disease spots, wherein the agents include a 10% validamycin aqueous solution, 30% benzoyl.propiconazole EC and 75% trifloxystrobin tebuconazole. According to the method, antibacterial treatment is carried out in two different stages from tobacco seedling transplanting to field planting stage management by combining the propagation characteristics of pathogenic bacteria of the thanatephorus cucumeris, deep ploughing, upturned soil sunning and disinfection are carried out on the cultivated land from the late winter to the early spring, the upturned soil sunning time is prolonged, and therefore pathogenic spores of the thanatephorus cucumeris can be better killed; and the different bactericidal agents are alternately applied after transplanting, so that drug resistance of tobacco plants is avoided, a good prevention and treatment effect is achieved, and the safety of tobacco planting is guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of tobacco disease prevention and control, and specifically relates to a method for preventing and treating tobacco target spot disease. Background technique [0002] The pathogen of tobacco target spot disease is Thanatephorus cucumeris (Frank) Donk, which is distributed in many countries and regions. It occurs in Brazil, Costa Rica, the United States, South Africa, Italy and other places, and the harm is serious. The disease first occurred in Dandong City, Liaoning Province, my country in 2005 and was officially reported in 2006. Since its discovery, its epidemic trend has continued to increase, with Dandong and Tieling cities being the most serious in Liaoning Province. It has become a major disease in tobacco production in this region. Sporadic occurrences have also occurred in Guizhou Province, a southwestern tobacco area. Tobacco target pathogen can not only infect tobacco, but also cause harm to man...

AI Technical Summary

Problems solved by technology

Tobacco target spot bacteria can not only infect tobacco, but also cause damage to many crops such as tomato, eggplant, sugar beet, etc., causing great obstacles to the production of various crops

Tobacco target spot disease mainly infects tobacco leaves, and can occur from the seedling stage to the mature stage in the field. The fungus mainly damages the leaves to form lesion spots, and the necrotic parts of the lesion spots are fragile and form perforations. When it occurs seriously, the lesion spots are connected and the disease is popular. The speed is fast, once it spreads rapidly, the contiguous occurrence will reduce the quality and yield of tobacco leaves, posing a serious threat to tobacco production

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