Recently, Yanhuang began to be listed. However, some farmers reported that the plant had rotted after harvest. The author's initial diagnosis was due to gray mold.
Botrytis cinerea mainly damages the yellow leaves, starts from the tips of the leaves and gradually develops downwards, causing the upper half or even the entire leaves to dry. Initially, the front or back of the blade scattered white to light brown dots, expanding to elliptical to spindle shape, the size of 2 to 7 mm. When the humidity is high, sparse brown-brown moldy layer grows on the lesions, and later lesions connect into pieces, resulting in the first half of the leaf or whole leaf scorch. After harvesting, yellow pods often rot down from the knife edge to form a "V" shaped spot. The old leaves that are closer to the ground are prone to soft rot due to high humidity and weak growth.
Pathogens of Botrytis cinerea are semi-known fungi of the genus Botrytis, which is a weak parasite. It is transmitted by air currents from conidial and conidial stalks. It can only pass from the wound and the orifice (mainly the tip of the orifice). Intrusion. At a temperature of 15 to 21°C and a humidity of 80% or more, the diseased part will appear as a gray-brown mold. In the greenhouse cultivation, yellow crops are harvested, resulting in a large number of wounds after harvesting. When the humidity is high, pathogens can easily invade from the wounds, resulting in aggravated diseases. Poor drainage, high planting density, partial application of nitrogen fertilizer, and severe disease when light is insufficient.
The occurrence of Botrytis cinerea in yellow locust should be controlled during the onset of disease, remove the diseased body, strengthen ventilation, and carry out chemical control. Can use 10% of procymidone smoke agent per acre 260 to 300 grams, scattered lit smoke overnight; also can use 50% procymidone wettable powder 1500 to 2000 times liquid, or 50% iprodione WP 1000 times liquid , Or 25% azoxystrobin suspension 1500 times spray. Botrytis cinerea is easy to produce drug resistance, pay attention to alternate medication.
Botrytis cinerea mainly damages the yellow leaves, starts from the tips of the leaves and gradually develops downwards, causing the upper half or even the entire leaves to dry. Initially, the front or back of the blade scattered white to light brown dots, expanding to elliptical to spindle shape, the size of 2 to 7 mm. When the humidity is high, sparse brown-brown moldy layer grows on the lesions, and later lesions connect into pieces, resulting in the first half of the leaf or whole leaf scorch. After harvesting, yellow pods often rot down from the knife edge to form a "V" shaped spot. The old leaves that are closer to the ground are prone to soft rot due to high humidity and weak growth.
Pathogens of Botrytis cinerea are semi-known fungi of the genus Botrytis, which is a weak parasite. It is transmitted by air currents from conidial and conidial stalks. It can only pass from the wound and the orifice (mainly the tip of the orifice). Intrusion. At a temperature of 15 to 21°C and a humidity of 80% or more, the diseased part will appear as a gray-brown mold. In the greenhouse cultivation, yellow crops are harvested, resulting in a large number of wounds after harvesting. When the humidity is high, pathogens can easily invade from the wounds, resulting in aggravated diseases. Poor drainage, high planting density, partial application of nitrogen fertilizer, and severe disease when light is insufficient.
The occurrence of Botrytis cinerea in yellow locust should be controlled during the onset of disease, remove the diseased body, strengthen ventilation, and carry out chemical control. Can use 10% of procymidone smoke agent per acre 260 to 300 grams, scattered lit smoke overnight; also can use 50% procymidone wettable powder 1500 to 2000 times liquid, or 50% iprodione WP 1000 times liquid , Or 25% azoxystrobin suspension 1500 times spray. Botrytis cinerea is easy to produce drug resistance, pay attention to alternate medication.
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