Abstract
1. An historical account is given of the theoretical aspects and practical use of hybrid vigour in tomatoes. Methods of producing hybrid seed in England are described, and the experimental results of outdoor trials with new hybrids at this Institution from 1940 to 1949 are given in detail. 2. Tests of crosses between Lycopersicum esculentum and L. pimpinellifolium had earlier given good heterosis, but fruits did not reach required commercial standards. Numerous crosses were now made between commercial varieties, and the best F1 hybrids were selected out each year. These were re-tested the following year, together with fresh hybrids. The consistently high yielders eventually were sifted out in this way. 3. Hybrid yields were measured as early (E), ripe (R) and total (T) crop weights, and compared against those for standard varieties. The inter-relations of E, R and T were analysed in commercial varieties and hybrids. 4. Various practical effects of heterosis in tomatoes were investigated. Heterosis has its main economic value in the increased early cropping, and hybrids have somewhat more stable yields than commercial varieties under varying environmental conditions 4. The history and method of production are given for two new F1 hybrids, Hertford Cross and Ware Cross.
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