152****4606 Mobile phone: I am Zhang Kelong in Zhangmiao Village, Huankou Town, Feng County. We have black spots on the leaves of wintering tomatoes here, which may be gray leaf spot. Will there be any medicine for treatment? Do you use Aimiao, Amisida, Thison Copper? In the case of tomato ash leaf spot, Ai Miao 300 g/l benziconpiconazole EC (difenoconazole and propiconazole are both 150 g/L) and Amisida (250 g/L) can be used. Azoxystrobin Suspension), Thousand Copper and other drug control. Tomato scab and other diseases will also form black spots on the leaves, pay attention to the difference between diagnosis and treatment. Tomato scab is a bacterial disease that can be controlled by copper agents such as thiason copper. The pathogen of tomato ash leaf spot was Solanum oleracea, a fungus belonging to the subphylum Aspergillus spp. (having the characteristic state called tomato coelgiobacteria, belonging to Ascomycetes subphylum fungi). The disease is mainly harmful to tomato leaves, petioles, stems, flowers, stems can also be infected. When the disease is endemic, the upper and lower leaves of the plant are affected at the same time. There were small brownish-brown near-circular lesions with a long diameter of 2 to 4 mm on the leaves. The lesions gradually developed irregularly along the veins. Perforation was easy at later stages and the leaves gradually withered. The onset of flowers is mainly on the calyx and pedicel, with 2 mm of gray-brown lesions. Flowering before the flower causes flowering; after fruiting, the incidence of calyx does not cause fruit drop, but it results in dry fruit. The incidence of stalks occurred in about 2 mm of grayish-brown near-circular depressions in the places where the incidence of leaves was heavy, and the disease gradually became dry. Slightly ill strains in time to prevent post-supplementation of fertilization materials, can grow new shoots and fruit; diseased plants withered. The pathogenic bacteria can overwinter on the soil diseased body and seed, and when the temperature and humidity are suitable for the next year, conidia are produced and the initial infection is performed. Spores are transmitted through wind, rain, water, and agricultural operations and reinfested. Warm and humid, long days of cloudy rain and condensation are important conditions for the onset of illness. The general soil fertility is insufficient, and the disease becomes severe when the plant growth is weak. Different tomato varieties have different resistance to the disease. Disease-resistant varieties of the lower leaves of the onset of heavy, vigorous growth of the leaf is not the incidence or incidence of light. Plants with strong growth susceptibility to disease are significantly lighter than plants with weak growth. Winter sowing tomato grows stronger than summer sowing tomato, so the incidence is lighter. Tomato ash leaf spot disease is prone to occur when the temperature is 20~25°C and relative humidity is above 80%, but it does not necessarily cause epidemic. When the temperature and humidity are appropriate and there is no rain, the disease only occurs on the lower leaves of some plants in individual plots; when the rainfall is continuous for 2 to 3 days, the diseases are likely to be popular. When greenhouses and greenhouses have high humidity and heavy condensation, the occurrence of diseases is also heavy. Agricultural control measures: (1) Selection of disease-resistant varieties. (2) Remove the diseased body in time and concentrate it away from the greenhouse. (3) timely release of wind and humidity, increase organic fertilizer and phosphorus and potassium fertilizers to enhance plant resistance. Chemical control: The main use of protective bactericide spray before the occurrence of the disease. Can use 20% Thiobacillus copper suspension 500 times, or 57.6% copper hydroxide 1000 times, or Dakkon 75% chlorothalonil wettable powder 600 times, or 80% mancozeb wettable 600 times liquid powder, or product run 70% of the Sensen dry suspension 600 times. Rainy days, greenhouses, greenhouse humidity, it is appropriate to use smoke and smoke from tobacco smoke and other diseases. At the beginning of the disease, a bactericide with a therapeutic effect and a compound with a protective bactericidal effect are used. Can be used Shigao 10% difenoconazole water dispersible granules 1500 times, or Amisida 250 g / l azoxystrobin suspension 1500 times, or antivirus 64% caustic MnZn wettable powder 400 Double liquid, or fast-acting net 52.5% oxazolone urea cyanide water dispersible granules (mixture of oxazole and cymoxanil) 1800 times, or easy to protect 68.75% oxone Mn-Zn water dispersible granules (evil Combination of pyraclozone and mancozeb) 1300 times, or Garrinon 47% Spring Thunder Copper wettable powder (mixture of kasugamycin and king copper) 700 times, or Kerry 25% Pyraclostrobin EC 1500 times. Every 7-10 days, continuous control 2 or 3 times. Use small-aperture spray jets as much as possible to reduce the surface humidity of the leaves. The topped field can be sprayed with 30% benziconpharmaceutical (3000 times solution) plus 50% sulfur suspension agent (1000 times solution), which has better control effect. The benzopropiconazole inhibits tomato growth to a certain extent, and the tomato vigorously grows with little or no use. Florfenicol Solubility,Florfenicol Swine,Florfenicol Chicken,Florfenicol Antibiotics Shandong Shengli Bioengineering Co., Ltd , https://www.shenglipharm.com
Tomato ash leaf spot prevention and control method Gray leaf spot control method
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