Anti-freezing measures of Fritillaria thunbergii and Corydalis tuber

The first and middle of March is the vigorous growth period of Fritillaria thunbergii, Yuanhu and other traditional Chinese medicine, such as severe spring cold or spring snow will break the plant, freeze-cracked stem, leaf freeze to death, or even the whole plant froze to death. If remedial measures are not taken in time, the output will be seriously affected. Key points of prevention and post-disaster field management:

1. The flowering Fritillaria thunbergii is ready to pick flowers before freezing to avoid freezing the tender stems. Clean up the snow on the plant in time after the spring cold or spring snow to avoid frost damage, and prune the plant broken by snow at the same time. And do a good job of ditch drainage, conditions can be carried out shallow loose soil, reduce field humidity, conducive to soil heating, so that the rapid recovery of plant growth. After the disaster, the flower picking work of Fritillaria thunbergii should be postponed appropriately.

2. The plants of Fritillaria thunbergii and Rhizoma Corydalis were sprayed with furnace ash or plant power 2003 before freezing to improve the resistance of the plants. After freezing, quick-acting chemical fertilizers such as N, P and K should be properly applied to supplement plant nutrition and reduce loss.

3. When the temperature rises above 15 ℃ after the disaster, disease prevention should be done. Pesticides such as Topurazine, Chlorothalonil and Dasheng can be used to prevent diseases such as Botrytis cinerea and downy mildew of Fritillaria thunbergii.