009 GENETIC VARIABILITY IN HIGHBUSH BLUEBERRY, VACCINIUM CORYMBOSUM L., FOR RESISTANCE TO THE BLIGHTING PHASE OF MUMMYBERRY, MONILINIA VACCINI-CORYMBOSII

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  • 1 USDA-ARS, Blueberry and Cranberry Research Center, Rutgers University, Penn State Forest Road, Chatsworth, NJ 08019

Potted plants of 53 highbush and half-high blueberry cultivars were screened for resistance to the blighting phase of mummyberry, Monilinia vaccini-corymbosii under controlled nursery conditions over an 18 day infection period. Significant differences were observed in the susceptibility of different cultivars, with `Bluehaven', `Bluegold', and `Blueray' being among the most susceptible, and `Bluejay', `Jersey', and `Duke' being among the most resistant. Differences were also observed in the latent periods and rate of disease progress which may have a bearing on the severity of the secondary fruit infection phase. Preliminary observations suggest that shoot blighting and fruit infection frequencies are not strongly correlated under high inoculum conditions.

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