How to control Botrytis cinerea of bracken

Bracken alias bracken, fist vegetable, leading dish, Ruyi vegetable, wolf Osmunda and so on, belong to the perennial herb of Pteridaceae. The edible part is the undeveloped pinnate leaves and young petioles from the leaf buds, which is a kind of wild mountain vegetable with high nutritional value and is known as "the king of mountain vegetables".

There are many kinds of bracken, different regional varieties have their own characteristics, generally according to the origin can be divided into the following:

1) Hebei Chengde bracken is a famous wild vegetable in Hebei Province. Chengde area covers an area of more than 33000 hectares, mainly in Longhua, Fengning, Pingquan, Kuancheng and so on. With an annual output of 1000 tons, it is the main production base of bracken in China.

2) Liaoning bracken is distributed in the mountainous areas of Liaoning Province, especially in the eastern mountainous areas. Mainly exported to Japan and other countries, the domestic market is also very popular.

3) Inner Mongolia bracken is distributed in all parts of Inner Mongolia, but the main producing areas are in Chifeng City, Xingan and other places, with an annual output of about 200 tons. The local harvest period is in June.

4) Heilongjiang bracken is distributed in the alpine areas with an altitude of 200 to 800 meters above sea level, and most of them are mixed with weeds. It was unearthed in mid-May and can be harvested from late May to early May.

5) Guizhou pteridophytes are widely distributed in Guizhou, and there are many species of edible pteridophytes. Among them, the local picking period of bracken is from mid-March to August.

How to prevent and cure Botrytis cinerea?

The disease symptoms of Botrytis cinerea of bracken: mainly damage the stems and leaves near the ground, initially showing water stain discoloration and rot. In severe cases, it extends to the petiole and is also rotten. When the humidity is high, the disease grows into a grayish brown or grayish yellow mildew layer. When the disease is serious, the whole plant turns yellow and dies.

The pathogenesis of Botrytis cinerea in bracken: the pathogen overwintered in the diseased tissue with conidia and sclerotia, often under the condition of low temperature and humidity. The bracken preserved in greenhouse is easy to suffer from low temperature and high humidity in early spring or late autumn to early winter.

Infection sites of Botrytis cinerea in bracken: stems and leaves

Disease classification of Botrytis cinerea in bracken: fungi

Prevention and control of Botrytis cinerea in bracken:

1) careful maintenance should pay attention to improve the temperature of the shed, reduce the humidity, and maintain ventilation and light transmission; once the disease occurs, ventilation and humidity will be reduced immediately, and the disease will be alleviated quickly.

2) spray 1500 times of 50% puthulide (Sukeling) wettable powder or 1000 times of 50% isobarbazide (prohydantoin) wettable powder. The areas with resistance to the above-mentioned fungicides were replaced with 65% methyl thioethanolyl (kedelin) wettable powder 1000 times, 40% pyrimidine (Shijiale) suspension 1200 times, and 28% chlorothalonil (Botrytis cinerea) wettable powder 500 times. Once every 10 days or so, continuous prevention and treatment for 2 or 3 times.