COMPARISON OF THREE METHODS TO ASSES LATENT CONTAMINATION OF FROZEN STRAWBERRY PLANTS WITH COLLETOTRICHUM ACUTATUM
Strawberry anthracnose, caused by Colletotrichum acutatum, is now a serious desease in France, especially on everbearing cultivars. Visual inspection of strawberry plants on the market is not sufficient for sanitary control. Moreover, satisfactory control is not obtained by using fungicides in nurseries or in fruit production fields. To avoid important losses by this fungus, it is necessary to set up a method to detect C. acutatum in symptomless plants. In preliminary studies, the reliability of three methods was evaluated on 33 import or domestic frozen plant lots. These were: 1) a paraquat test; 2) a biological test on apple fruits; and 3) a modified paraquat test using selective media. The results from methods 1, 2, and 3 were 5, 2, and 10 positive samples, respectively, from 33 plant lots. The third method was the most sensitive and could be used to certify material produced in France and to check imported lots.
Morzieres, J.P. and Baudry, A. (1993). COMPARISON OF THREE METHODS TO ASSES LATENT CONTAMINATION OF FROZEN STRAWBERRY PLANTS WITH COLLETOTRICHUM ACUTATUM. Acta Hortic. 348, 504-508