How to prevent and control soft rot in Fritillaria thunbergii? Teach you the correct method

Soft rot in Fritillaria thunbergii is an important disease affecting the summering of Fritillaria thunbergii grown for seed. In recent years the damage has become increasingly severe, seriously affecting the development of Fritillaria thunbergii production.

Symptoms of soft rot: the affected bulbs are initially water-soaked, and the rot spreads very quickly; in the end the bulbs become soft and rotted, turning into a mushy "tofu dregs" or "paste" consistency, or becoming a slimy "snot"-like state, with a peculiar foul odor.

Pattern of soft rot occurrence: Fritillaria left to summer in place mostly develops the disease during the plum rain season (May to June), the dog days (August), and the season of frequent rainstorms. It is especially likely to occur where the field is low-lying with standing water, where the soil is heavy and clayey with poor aeration, or where the bulbs were not fully spread out to air-dry before storage and the wounds or insect scars had not healed, or where the sand used for storage is too wet.

Control methods:

(1) For the seed-producing field, choose medium sandy soil on high, dry terrain with good drainage and rich in organic matter.

(2) Soak the seed with 50% carbendazim or 75% chlorothalonil.

(3) Frequently dig ditches in the field for drainage, keeping it free of standing water.

(4) Do a good job of pest control to prevent the seed coat from being bitten through. When harvesting the bulbs, take care to avoid damaging the seed coat.