Abstract
Several species ofFusarium cause both dry rot in storage and seedpiece decay in the field, which results in severe losses in all major potato-growing regions. In temperate climates twoFusarium species are the principle causes of tuber dry rot-F.sambucinum andF. coeruleum. Resistance toF. sambucinum was identified in cultivated and wildSolanum species. Relatively high levels of resistance exist in the following 2EBN species:S. boliviense (PI#’s 265860, 310975, 310974, 545853, 545889, 545964),S. gourlayi ssp.gourlayi (PI#’s 473344, 545865),S. microdontum (PI#’s 310979, 473171),S. sancta-rosae (PI# 498392),S. kurtzianum (PI# 472930),S. fendleri ssp.fendleri (PI# 262895),S. gandarillasii (PI#’s 265866, 283076),S. oplocense (PI# 498281) andS. vidaurrei (PI# 498332). The resistance is highly heritable but appears, at least in some of the species, to be associated with recessive alleles.
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