SUSCEPTIBILITY OF STRAWBERRY CULTIVARS TO RHIZOCTONIA SOLANI AND R. FRAGARIAE AS INFLUENCED BY INOCULATION TECHNIQUE, SEASONAL VARIATIONS AND PHYSIOLOGICAL CONDITION OF THE PLANTS

P.M. Molot, H. Ferrière
The strawberry decline (poor recovery, weak root system, root necrosis and foliar drying) can be caused by several factors. Among these factors, damage due to Rhizoctonia solani and R. fragariae fungus diseases are more and more observed in France.

With the "Redgauntlet" strawberry variety, several methods of artificial infection techniques have been compared. The most efficient one consisted of a "sandwich"-like layer of inoculum plus vermiculite in the mid-height of the pot filled with potting soil. The soaking of plants in mycelial suspension during 3 days gave also good results.

Applying such an inoculation technique under glasshouse condition during the whole year round on two varieties showed that the two varieties and especially "Gorella" have a maximum susceptibility between April and June and a minimum one in winter.

The aggressiveness of the two fungus species, using the same inoculation technique, has been evaluated on different varieties of strawberry that were maintained under normal and cold room condition.

Results showed that R. solani is more aggressive than R. fragariae and plants picked up immediately from nurseries are more susceptible than the ones kept in cold storage room.

Molot, P.M. and Ferrière, H. (1989). SUSCEPTIBILITY OF STRAWBERRY CULTIVARS TO RHIZOCTONIA SOLANI AND R. FRAGARIAE AS INFLUENCED BY INOCULATION TECHNIQUE, SEASONAL VARIATIONS AND PHYSIOLOGICAL CONDITION OF THE PLANTS. Acta Hortic. 265, 535-540
DOI: 10.17660/ActaHortic.1989.265.79
https://doi.org/10.17660/ActaHortic.1989.265.79

Acta Horticulturae