FIELD EVALUATION OF FOURTEEN STRAWBERRY GENOTYPES IN QUEBEC AND THEIR RESISTANCE TO TEN RACES OF PHYTOPHTHORA FRAGARIAE

Fourteen strawberry genotypes (Fragaria × ananassa Duch.) were evaluated for yield and fruit size. ‘Honeoye’ was found to be the highest yielding cultivar, followed by ‘Kent’, ‘Chambly’, ‘Glooscap’, and ‘Oka’. Greenhouse grown plants of the fourteen genotypes were later inoculated with individual or a mixture of North American (NA) eastern races (A-1 to A-6) and NA west coast races (A-7 to A-10) of Phytophthora fragariae. A disease severity index (DSI), based on the number of oospores in the root stele and the percent root length with stelar reddening was used to quantify genotype susceptibility. ‘Jewel’, ‘Elvira’, ‘Veestra’, ‘Annapolis’, and ‘Midway’ were found to be more resistant than the other genotypes to the mixture of the ten races (A-1 to A-10) of P. fragrariae. Inoculation with individual races showed that ‘Annapolis’ and ‘Sparkle’ were resistant to most races of P. fragaria, whereas ‘Honeoye’ and ‘Bounty’ were the most susceptible. (Published: 1992, J. Small Fruit & Viticulture 1(3):35–48.)

II International Strawberry Symposium

S. Khanizadeh, R. Pelletier, M. Lareau, D. Buszard

https://doi.org/10.17660/ActaHortic.1993.348.108