Survival of Colletotrichum acutatum in plant residue
2016
The survival of Colletotrichum acutatum in soil and on soil surface was investigated in different climatic conditions in Finland, Norway, and Denmark in 2008-2012. The trial places in Finland were Jokioinen, Mikkeli, and Sotkamo; in Norway, Ås and Ullensvang; and in Denmark, Copenhagen. The trials started in Finland in October 2008, in Norway and Denmark in October 2009, and lasted for three years. Artificially infected strawberry plant parts were placed on the soil surface and at 7-9 cm depth, and survival of the material was checked during the trial years in spring and autumn, using bait tests and PCR. Colletotrichum acutatum was able to survive only over one winter in Copenhagen, in Ås for one year and in Ullensvang for two years. In Jokioinen, the pathogen was able to survive 18 months in soil. The longest survival, 30 months was observed in Sotkamo. C. acutatum was also detected on weeds growing on the trial sites in Finland. The study showed that C. acutatum can survive in soil or on the soil surface in plant residue in Nordic conditions for nearly 3 years. Weeds can have infections of infested plant debris. In disease management, weed control and crop rotation for three years are important to control its spread to berry crops.
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