Consultant of the farmers in Guazhou: I have already produced a lot of results in greenhouse peppers. However, the first two days I ditched water from the gully, and the stems of some plant stems turned black, and they died slowly. What disease is it? How to do?
Answer: The death of black stem base is Phytophthora capsici. The pathogen is Phytophthora capsici.
Phytophthora capsici is a devastating soil-borne disease. Germs pass the winter through the soil and livestock feces. Bacteria like high temperature and high humidity, the incidence of the fastest 27 °C -30 °C shed. However, when germs come into contact with the stem of the pepper, they must be exposed to high humidity and water film for 4-6 hours to complete the dip. Therefore, the key to combating this disease is to control the humidity in the shelter, especially to shorten the condensation time.
Since the peasant in Guazhou was watered the night before, it caused the disease. This is the key to the problem. Now that it has entered the winter, after the watering at night, the continuous low temperature in the shed causes high air humidity and long stemming time, which is conducive to the spread of germs. Therefore, after the peasant friends grow peppers in the greenhouse and enter the winter, the irrigation can only be sunny morning, and the ditch can be filled with water under the membrane. After irrigation, it is necessary to tightly close the air vents until the temperature rises to 28°C-29°C. After the surface of leaves and stems are vaporized, the top vents must be opened to ventilate and ventilate. Avoid flooding on cloudy, rainy or snowy days, nor can they be flooded.
Diseases have already occurred. If individual plants die, they should be removed immediately and then sprayed thoroughly. 70% EB wettable powder 800-1000 times, 40% EB wettable powder 250 times, 58% metalaxyl MnZn wet powder 500 times, 72% cream urea MnZn (g Dew) wettability Powder 800 times or 60% Anke manganese zinc WP 1500 times spray, every 7-10 days, continuous use 2-3 times,
Spraying method: Spray the whole plant with spray irrigation, then the sprayer focuses on the stalk base around a few turns, so that the stem base and root system are glued to water. 45% chlorothalonil aerosol may also be used to smoke at a dose of 250 grams per acre, once every 9 days, 2-3 times in succession.
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