ISHS Acta Horticulturae 262: V International Symposium on Rubus & Ribes
SCREENING RASPBERRY (IDAEOBATUS) HYBRIDS FOR RESISTANCE TO VERTICILLIUM ALBO-ATRUM. |
| Authors: | Joseph A. Fiola, Harry J. Swartz |
| Abstract:
Procedures were developed to sereen for resistance to Verticillium wilt and raspberry hybrid seedlings were screened to develop resistant germplasm. Seedlings of an incomplete partial diallel of the cultivars 'Haut', 'Jewel', and 'Amethyst', 'Royalty', 'Southland', and 'Willamette' hybrids were root-dipped in a mycelial slurry of Verticillium albo-atrum Reinke and Berth., stem inoculated with a conidial suspension, and transplanted to greenhouse tanks. Symptoms appeared in five weeks; individual plants were subjectively scored (1 = no symptoms thru 5 = dead). Reisolation of the fungus from plants with low disease scores revealed Verticillium tolerance in the Idaeobatus. Average disease scores increased as the percentage of black raspberry in the background increased, following a significant (P = 1%; R2 = 0.90) linear trend. A similar significant (P = 5%; R2= 0.66) linear trend was found with fungus reisolation percentages, higher percentages being found in the black raspberries. Vegetatively vigorous hybrids with high tolerance have been selected. | |
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