SUSCEPTIBILITY OF STRAWBERRY VARIETIES TO CROWN ROT (PHYTOPHTHORA CACTORUM) IN GREENHOUSE TESTS

The susceptibility of 55 strawberry varieties to crown rot, caused by Phytophthora cactorum, was evaluated in the greenhouse at MTT Plant Protection in 1993-2001. Crowns of fresh runner plants were wounded and inoculated with P. cactorum mycelium.
The principal strawberry cultivars grown in Finland, ‘Jonsok’, ‘Senga Sengana’, ‘Polka’, ‘Honeoye’, ‘Bounty’ and ‘Korona’, were tested several times. ‘Jonsok’ was very susceptible to crown rot and ‘Polka’, ‘Korona’ and ‘Honeoye’ proved to be quite susceptible, too.
Some cultivars were less resistant when tested during the summer months than in winter. ‘Bounty’ and ‘Senga Sengana’ showed high resistance during winter but in summer their resistance decreased from high to moderate.
Autumn and spring are more suitable times for screening resistance than summer and winter.
For subsequent testing ‘Jonsok’ was chosen as a susceptible and ‘Sara’ (Fragaria vescana) as a resistant control for comparative evaluation of resistance.

XXVI International Horticultural Congress: Berry Crop Breeding, Production and Utilization for a New Century

P. Parikka

Fragaria x ananassa, crown test, disease resistance, screening

https://doi.org/10.17660/ActaHortic.2003.626.24