Pay close attention to controlling botrytis cinerea

Recently, prolonged periods of low temperature, cloudy days, and low sunshine have caused widespread occurrence of Botrytis cinerea in greenhouses. Tomatoes, eggplants, peppers, cucumbers, kidney beans, celery, leeks, and strawberries have all occurred. Losses are serious. Some greenhouses can reduce production. %the above.

Symptoms

Botrytis cinerea primarily damages the upper parts of the leaves, stems, flowers, and fruits of vegetables. First, the disease begins to occur on the leaves, petals, and fruits near the ground, and then it infects other parts. The fruit is the most affected. The fruit usually appears at the near fruit pedicle, stalk, or fruit umbilicus. Symptoms are pale, soft, water-stained, and spread quickly. The surface of the diseased surface is covered with a gray mold layer. Petals turn brown and rot after infection, with a dense layer of gray mold. After the stems and branches became infected, there appeared grayish-white or brown irregular shaped lesions, and the diseased parts produced gray moldy material. After the lesions spread around the stems and shoots one week later, the lesions on the upper end of the lesions wilted and died. Leaf disease, generally from the leaf edge inwardly "V" shape expansion, or form a large light brown to yellow brown lesions on the leaf. A gray mold layer is produced.

Causes

Diseases caused by fungi, pathogens attached to the sick or left in the soil for winter, spread by wind, rain, air, irrigation water and agricultural operations. Insufficient light, high humidity, and low temperature are important conditions for the spread of gray mold. Generally more than cloudy days, the temperature is not high, the humidity in the shed is large, the condensation lasts for a long time, the air release is not timely, and the incidence is heavy. Botrytis cinerea is a weak parasite that invades the host's wounds, aging organs, or dead tissues. The flowering period is the peak period of infestation, and flowering can spread artificially, especially when water is inflated during fruit enlargement. period.

Prevention

(1) The greenhouse must be ventilated to reduce the humidity.

(2) Watering should be performed on sunny mornings with drip irrigation. After onset, watering should be properly controlled to reduce condensation on the roof and leaf surface and water spray on leaf margins.

(3) Clean the dust on the roof and enhance the light.

(4) After the onset, the diseased flowers, diseased fruits, and diseased leaves were removed and taken out of the greenhouse.

(5) Take the drug when dipping, add 0.1% of 50% acetaminophen wettable powder to the prepared 2,4-D or anti-dropping agent dip, and then apply or smear the flower to medicine.

(6) In case of overcast days, the greenhouse can be used with 10% quick-silver smoke agent 300 grams per acre, 5% Garnett dust agent 1 kg per acre, every 9 to 11 days with 1 time, continuous use 2 to 3 times.

(7) At the beginning of the disease, 65% of KedeLing WP 1000x, 50% of Kaiser Water Dispersible granules 1500x, and 50% of acetaminophen WP 1500x can be sprayed every 7 to 10 times. Spray 1 day, 2 or 3 times in a row, pay attention to the alternate use of pesticides.

(8) Low temperature and low sunshine make the growth of vegetables weak. When the application is applied, high bio-active seaweed fertilization can be added to Fertivagra 1000 times solution or chelated micro-fertilizer Stykopoop 1000 times to enhance the vigor and resistance of vegetables. Resistance.

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