Introduction and control of bulb soft rot of lily

Lily, Liliaceae Lilium is a perennial herbaceous bulbous plant, mainly distributed in eastern Asia, Europe, North America and other temperate regions of the Northern Hemisphere. More than 100 varieties have been found in the world, and China is the main place of origin, with more than 50 species, which is the natural distribution center of the genus Lilium. In recent years, there are many new varieties produced by artificial hybridization, such as Asian lily, musk lily, perfume lily and so on.

The disease occurs in the process of storage and transportation of lily bulbs.

Symptoms: at the initial stage of the disease, the susceptible scales produce water-stained spots, then turn dark brown, and the bulbs soften and rot. In the later stage of the disease, a thick mildew layer grows on the surface of the disease spot, and many sporangia that are white first and then turn black are produced in the mold layer.

The pathogen is Rhizopusstolonifer (Ehrenb.exFr.) Vuill. And Rhizopus nigricans (R.nigricannsEhrenb.), belonging to Zygophyta, Zygomycetes, Mucor, Rhizopus fungi.

Disease regularity: pathogens widely exist in nature, with cyst spores invading plant scales from the wound, forming mycelium in the plant, the mycelium can reach the base of the scale, and then invade other scales. In the warm, humid and poorly ventilated storage and transportation environment, the disease spread rapidly and the bulbs rotted quickly. The pathogen has weak parasitism and strong pathogenicity, which can lead to the decay of many succulent vegetables, fruits and storage organs.

Prevention and treatment: avoid causing wounds in the process of harvest, packaging, storage and transportation, and keep low temperature in the process of storage and transportation.