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- Author or Editor: James H. Siefker x
Inbreeding coefficients were calculated for the 63 cultivars of blueberry (Vaccinium corymbosum L.) released by public agencies in the United States. A steady increase in coefficients was noted from the period of 1910−1920 (F=0.00) to 1960−1970 (F=0.13). ‘Lateblue’ and ‘Flordablue’ had the highest coefficient of 0.25. Most of the genes in the cultivars came from the wild selections ‘Brooks’, ‘Sooy’ and ‘Rubel’.
Sixteen cultivars of blueberry (Vaccinium corymbosum L.) were field screened for resistance to the blueberry aphid Illinoia pepperi (McGillivary), the vector of blueberry shoestring virus. Significant differences were observed with ‘Bluejay’, ‘Northland’, ‘Bluetta’ and ‘Bluehaven’ supporting the lowest numbers, while ‘Spartan’, ‘Darrow’, ‘Lateblue’, ‘Coville’ and ‘Jersey’ carried the highest numbers. There was no significant correlation between aphid number and new shoot number, percentage of shoots with new growth, length of new growth, leaf length or leaf width. Half of the aphids were found in the lower 1/3 of the bushes.