Diallel Analysis of Bacterial Wilt Resistance in Tomato Derived from Different Sources.

Bacterial wilt, caused by Ralstonia solanacearum, is a major constraint to tomato production in the tropics and subtropics. Most bacterial wilt-resistant tomato cultivars have not shown consistently high resistance levels over locations. The objective of this study was to determine whether combining resistance derived from different sources would result in F progenies with resistance greater than that of the parents.