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Symptoms and Control Methods of Tulip Bulb Rot Caused by Sclerotium tuliparum

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Symptoms: The disease affects tulip seedlings and bulbs. In the early stage of the disease, the outer scales of the infected bulbs develop soft rot, and many white silky mycelial strands grow on the diseased parts and the nearby soil surface. In the later stage of the disease, many sclerotia form. The sclerotia are round or irregular in shape, initially white, later turning brown to black, with a lighter interior color and tightly packed tissue. After seedlings are infected, the small leaves die as soon as they emerge. Pathogen: The pathogen is Sclerotium tuliparum Kleb, belonging to the Deuteromycotina, Hyphomycetes.

Symptoms: The disease affects tulip seedlings and bulbs. In the early stage of the disease, the outer scales of the infected bulbs develop soft rot, and many white silky mycelial strands grow on the diseased parts and the nearby soil surface. In the later stage of the disease, many sclerotia form. The sclerotia are round or irregular in shape, initially white, later turning brown to black, with a lighter interior color and tightly packed tissue. After seedlings are infected, the small leaves die as soon as they emerge.

Pathogen: The pathogen is Sclerotium tuliparum Kleb, a fungus belonging to the Deuteromycotina, Hyphomycetes, Agonomycetales.

Disease pattern: The pathogen overwinters in the soil as sclerotia. Under conditions of high temperature and high humidity, the disease occurs severely.

Control: (1) When storing, remove diseased bulbs. (2) The storage room should be well ventilated, and the temperature should be kept below 20°C.

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