Abstract
SUMMARYRoot rot symptoms and yields of an advanced breeding line of tomato (J513) tolerant to brown root rot (BRR) were compared with those of the susceptible cultivar Ailsa Craig when both were grown in glasshouse soils having different amounts of inoculum of Pyrenochaeta lycopersici Schneider & Gerlach. Less BRR was found on J513 than on Ailsa Craig in both 1972 and 1973 and the decline in yield with increasing soil inoculum was less on J513 than on Ailsa Craig. However, the yield of J513 on freshly sterilised soils was less than that of Ailsa Craig, so that overall the yields of J513 were no heavier than Ailsa Craig on the soils used. Thus, whilst the BRR tolerance was demonstrably effective, further improvements in the agronomic potential of tolerant lines are necessary to exploit this tolerance where BRR is not severe.
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