FIRST REPORT OF CHARCOAL ROT OF STRAWBERRY IN FRANCE
Since 1989, in a few strawberry fields of Aquitaine (south-west of France), the charcoal rot organism Macrophomina phaseolina Tassi was isolated from internal crown lesions of strawberry plants of severalt cultivars: Pajaro, Rio grande, Elsanta, Maraline, Chandler, and Gariguette. It was frequently observed from fields where sunflowers were cultivated. Infected plants showed symptoms of wilting, dwarfing and sometimes died. We have inoculated 11 of those isolates alone or with one strain of Colletotrichum acutatum on ‘Pajaro’ plants. Experimental conditions are were 12 hours of light, and 36°C/21°C day/night temperatures. All of the isolates were pathogenic under those conditions but we have observed wide differences in aggressiveness. After 8 weeks, the fungus caused necrosis of petioles and dwarfing, and 6% to 50% of plants died after 8 to 15 weeks. Inoculations with C. acutatum showed synergy or additivity with some isolates and antagonism with other M. phaseolina isolates.
BAUDRY, A. and MORZIERES, J.P. (1993). FIRST REPORT OF CHARCOAL ROT OF STRAWBERRY IN FRANCE. Acta Hortic. 348, 485-488