Death of okra caused by Fusarium wilt how to control okra wilt

With the improvement of people's living standards, many vegetables have been added to the common people's vegetable tables, such as okra. Fusarium wilt is also one of the main diseases harmful to okra, and its harmful symptoms and control methods are as follows.

okra wilt

1. Symptoms: Okra blight occurs when Fusarium invades plant vascular tissue. Its typical symptom is withered branches and leaves. At the beginning of the disease, the leaves of the diseased plants gradually withered from top to bottom, like lack of water. At noon, the symptoms of withering were more obvious, but they could still recover when the temperature was low and humidity was high in the morning and evening. After a few days, the disease aggravated, then the whole plant withered droop, or even death. Observing the base of Okra diseased plants, water-stained spots can be found, and then turn yellow brown or black brown, cut the neck can also be seen vascular brown. Pathogens are transmitted through soil and can also occur from seeds. Long incubation period of pathogen, difficult to control. Where the soil is sticky, the terrain is depressed, the groundwater level is high, the drainage is poor, and the farmland with poor ventilation performance is more likely to occur; excessive nitrogen fertilizer, insufficient phosphorus and potassium fertilizer, or the application of undecomposed livestock manure is also easy to occur.

II. Control methods:

1, agricultural control: the implementation of water-drought rotation, which is the most basic control measures, rotation cycle should be as long as more than three years. Construction of deep and high furrows, lowering of groundwater level and improvement of drainage capacity of farmland soil can obviously reduce the incidence of disease. Rational application of phosphorus and potassium fertilizer can improve the disease resistance of vegetable crops. Bed soil disinfection and seed disinfection are feasible when sowing seedlings, so as to prevent diseases first. The method of bed soil disinfection is to irrigate the soil with formalin diluent, generally 50g of medicine per square meter of seedbed, evenly sprinkle with 2- 4kg of water, cover a layer of plastic film on the soil surface after watering, open the cover after sealing for 4-5 days, and rake the topsoil to volatilize and eliminate the residual medicine, and sow it half a month later to avoid the young seedlings from suffering from phytotoxicity; Seed disinfection can be soaked in warm soup. First, the seeds are soaked in water at room temperature for 15 minutes to promote the germination of germs on the seeds, and then put into hot water of 55-60 degrees for 15 minutes (during this period, the water temperature should be kept unchanged) to kill germs. In order to heat the seeds evenly, it is necessary to continuously stir them until the water temperature drops to 35 degrees Celsius, then stop stirring, and then continue to soak for 6 hours before taking them out, and seed them after germination.

2. Chemical control: In the early stage of disease, the root of the drug is poured, and the sterilization is obvious. Drugs can be selected: 1.50% carbendazim 500 times diluted solution; 2.40% Kangkuning 800-1000 times diluted solution; 3.77% can be killed by wettable powder 600-800 times diluted solution; 4.50% seed dressing double wettable powder 500 times diluted solution. Pouring roots once every 5-7 days for 3-4 times. At the same time, timely removal of okra disease plants, to be destroyed.