Wu Jiabao, Changfeng County, Anhui Province, said on December 17 that more than 3 acres of greenhouses are in the fruiting period of the flowering period. The disease has been on the last 3 to 4 days. The roots of the diseased stems are rotted, resulting in wilting of the plant leaves, and the diseased plant rate reaches 10%. It is understood that the strawberry variety is Fengxiang, which was used after the onset of agricultural streptomycin sulfate, but the effect is not good. Before the onset of the disease, there was a snowstorm in the local area. After the temperature rose, it did not promptly open the air and the temperature in the shed was high and the humidity was high. He asked what happened to strawberries and how to prevent them. On December 21st, Agrotechnical Studio 001 received the strawberry strain he had sent with special express delivery. Examination of the diseased plants revealed that the base of the stem turned brown and rot, and some of the roots became brown. Cut the base of the diseased stem, the vascular bundle does not change color. According to the preliminary diagnosis made by researcher Zhao Mizhen, director of the berry research office of the Institute of Horticulture, Jiangsu Academy of Agricultural Sciences, and vice president of the China Strawberry Association, strawberry may have anthrax. It is understood that strawberry anthracnose mainly occurs in the nursery period and the initial stage of colonization, and the result period rarely occurs. It mainly damages the stolon, petiole, leaves, stipules and petals. The distinctive feature of strawberry after infection is localized lesions and wilting of whole plants. The stolons, petioles, and leaves are infected. The disease produces black spindle-shaped or oval-shaped ulcers with a diameter of 3-7 mm at the beginning of the disease. The lesions are slightly concave. When the lesions on the stolons and petioles expand into an annular ring, the upper part of the lesions wilts and die. When the humidity is high, the red mucinous spore masses can be seen in the disease department. In addition to the disease caused by local lesions, but also easily lead to susceptible varieties, especially strawberry seedlings wilting and withered. After the onset of the leaf base and shortened stems of the mother plant, 1 to 2 leaflets in the initial stage lost water and drooped, and returned to normal in the evening or cloudy days. As the disease progressed, the whole plant withered. In the cross-section of the root crown of the dead dead plant, browning occurs from the outside to the inside, but the vascular bundle does not change color. Why do strawberry plants have anthrax during flowering? Zhao Mizhen analyzed that anthrax pathogens are in a high-temperature and high-humidity environment, with an infection temperature of 28-32°C and a relative humidity of more than 90%. When strawberry grows in a high temperature and high humidity environment, the young tissue on the stolon or near the ground will be infected by bacteria and cause disease. Before the onset of strawberry in the greenhouse, the temperature did not promptly ventilate and ventilate after the temperature rose, and the high temperature and humidity in the shed were the main reasons that caused the bacteria to invade the plants and cause the disease. After the anthracnose disease occurred in strawberry, the control effect of the drug was poor. The use of the drug in the early stage of the disease can protect the healthy plant from pathogenic bacteria. The diseased field can be removed from the diseased field, and the root can be sprayed or spray protected with prochloraz, carbendazim and other drugs. As the strawberries in the greenhouses of the above plots are in the fruiting period, spraying the pesticides may affect the results and it is advisable to adopt the method of irrigating the roots. To control strawberry anthracnose, measures should be taken to prevent it from the nursery stage. The first is the selection of disease-resistant varieties. The new strawberry variety Ningyu, developed from the gardening institute of Jiangsu Academy of Agricultural Sciences, is significantly better than Mingbao and Fengxiang, and its quality is equivalent to that of Hongbu and Zhangji. It is also resistant to storage and transportation and can be stored for 3 days. The second is to disinfect seedbed soil and implement rotation as much as possible. The third is to control the density of seedbed breeding, but no amount of nitrogen fertilizer, organic fertilizer and phosphorus and potassium fertilizers added, cultivate robust plants, improve plant disease resistance. Fourth, timely removal of diseased leaves, diseased stems, dead leaves, old leaves, and removal of diseased plants, and central burning and reduction of transmission. The fifth is to start drug prevention from the strawberry seedling stems during the pumping period. Choose 60% Pyraclostrobin Synthetic Dispersible Granule 800 times, or 10% Difenoconazole Water Dispersible Pellet 1000X, or 25% Prochloraz Emulsion 1000X, or 70% Thiophanate-methyl dry suspension agent 600 times, or 25% bromocretonitrile wettable powder 500 to 800 times, or 75% chlorothalonil wettable powder 800 times, etc., control once every 10 days. In case of typhoon or heavy rain, use 25% pyraclostrobin EC from 1500 to 2000 times to prevent and control once rain is fine. Application should be carried out in the evening, add enough water, focus on the short stem, stolons and other near surface spray, alternating medication, to delay the emergence of pathogen resistance.
Description:
Gentamycin belongs to the group of aminoglycosides and acts bactericidal against mainly Gram-negative bacteria like E. coli, Klebsiella, Pasteurella and Salmonella spp. The bactericidal action is based on inhibition of bacterial protein synthesis.
Indications:
Gastrointestinal and respiratory infections caused by gentamycin sensitive bacteria, like E. coli, Klebsiella, Pasteurella and Salmonella spp. in calves, cattle, goats, sheep and swine.