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Performance traits for twelve strawberry genotypes (Fragaria × ananassa) were evaluated in annual hill culture, with and without preplant soil fumigation (methyl bromide/ Chloropicrin 67:33, 350#/A) at two location. One trial followed several cycles of strawberry plantation whereas the other had not been planted to strawberries for over 20 years. Plant mortality was less than 3%. thus the main effects of fumigation treatment in these experiments must be due to sublethal effects of soil organisms. Plants grown in nonfumigated soil yielded 57% and 51% of the fruit produced by plants on adjacent fumigated soil, for “new” and “old” strawberry ground respectively. Highly significant (P&lt;0.01) differences were also detected for fruit weight (88% and 93%) and leaf number after plantation establishment (73% and 80%). Significant genotype × fumigation interaction was not detected for any of the Performance traits. These results demonstrate that strawberry productivity is substantially increased by fumigation, even in the absence of lethal pathogens. More importantly, little opportunity exists for developing cultivars specifically adapted to nonfumigated soils.

015 PERFORMANCE OF TWELVE STRAWBERRY GENOTYPES IN FUMIGATED AND NONFUMIGATED SOIL