First Report of Anthracnose Fruit Rot Caused by Colletotrichum acutatum on Strawberry in Sweden

Plant Disease
U NilssonG Svedelius

Abstract

Strawberries (Fragaria × ananassa) are the most important soft fruit crop in Sweden and most commonly grown as a perennial crop. Colletotrichum acutatum J.H. Simmond was detected on strawberries in Sweden for the first time in the autumn of 2003. Anthracnose caused by C. acutatum has previously been found on rhododendron in Sweden (2). The infected strawberry plants, cv. Kimberly, were found in a field in the northeastern part of Skåne in southern Sweden. The first plant sample was collected during September 2003, and a second sample was collected during the end of June 2004. Symptoms were seen on stolons as elliptical, black, sunken lesions and irregular black leaf spots originating from the tip. No symptoms were seen on immature green fruits. However, the farmer had observed black spots on the fruits the previous year. Immature fruits were collected in the field, surface sterilized with 70% ethanol, dipped for 1 min in 1.25% NaOCl, and thereafter rinsed in distilled water. Fruits were incubated in a moist chamber at 23°C. The first symptoms were seen as black spots after 3 days; later, salmon-colored conidial masses were produced from acervuli in the center of the lesions. The fungus was isolated on potato dextrose agar (PDA)...Continue Reading

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