Photo 1. Sclerotinia on soybean. Note the fungus has destroyed the roots of these three plants, and large balls of the fungus called sclerotia have formed on the stem and tap root. These will germinate to produce a mushroom-like body that produces spores.
Photo 2. Severe wilt of lettuce caused by Sclerotinia soft rot fungus. The fungus produces sclerotia (see Photo 1) and these can survive in the soil for many years.
Cottony soft rot, Sclerotinia soft rot, collar rot, white mould, lettuce drop.
AUTHOR Grahame Jackson
Information (and Photo 1) from Diseases of vegetable crops in Australia (2010). Editors, Denis Persley, Tony Cooke, Susan House. CSIRO Publishing. Photos 2&3 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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