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Heritability of Verticilium Wilt Tolerance in Crosses of American Upland Cotton¹

Broad-sense heritability estimates of tolerance to Vertieillimn wilt [Verticillium albo-atrum (Reinke and Berth)] under severe field exposure in American Upland cotton (Gossypium hirsutum L.) were compared using F₁ and F₂ generations of tolerant x susceptible crosses. Heritability estimates varied from 0 to .833, depending upon exposure level, generation tested, and type of parental tolerance present.

Tolerance to Verticullium wilt was found to be recessive for the crosses studied. Selection based on progeny row yield was effective when Verticillium wilt was severe.

Susceptible F₂ plants produced homozygous susceptible F₃ rows but progeny testing of tolerant F₂ plants was necessary to detect escapes.

Key Words: Gossypium hirsulum L. • Phenotypic escapes • Regression • Selection efficiency • Penetrance • Verticillium albo-atrum (Reinke and Berth).

² Research Associate and Professor Emeritus of Agronomy, Department of Agronomy, New Mexico State University, Las Cruces, 88001.

Received for publication June 17, 1971.