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Fusarium Wilt Resistance in Day-Neutral Selections from Primitive Races of Cotton and Crosses of Race Selections with a Commercial Cultivar¹

Day-neutral plants of selections from the primitive cotton (Gossypium hirsutum L.) race collection and from crosses of these with ‘Deltapine 16’ (DPL-16) were evaluated for resistance to Fusarium wilt [Fusarium oxysporum Sehlect. f. vasinfectum (Atk.) Snyd. & Hans.]. Yield and fiber properties of advanced material from these crosses were also determined. When evaluated as race stock selections per se, or as advanced generation materials from crosses with DPL-16, Fusarium wilt resistance of materials with either an accession 69 or 88 background was high. Selections of advanced materials from crosses of DPL-16 with six other race accessions (78, 80, 87, 113, 116, and 495) were also highly resistant. Based on a I-year evaluation at one location lint yields and fiber properties of all advanced materials (BC₂F₄) from crosses with DPL-16 were not statistically significant from those of the two check cultivars (DPL-16 and ‘Stoneville 213’).

Key Words: Host-plant resistance • Gossypium hirsutum L.

² Research plant pathologist, USDA, SEA, AR, Auburn, AL 36830; research geneticist and research entomologist, USDA Boll Weevil Research Laboratory, SEA, AR. Mississippi State, MS 39762, respectively.

Received for publication November 18, 1978.