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Effects of Okra Leaf Shape on Boll Rot, Yield, and Other Important Characters of Upland Cotton, Gossypium hirsutum L.

The effects of okra leaf shape on boll rot, yield, and other important characters of Upland cotton (Gossypium hirsutum L.), were investigated at three locations in Louisiana and on three varietal backgrounds. Varieties responded in a similar manner to the leaf shape treatments for all characters studied, but the location x leaf shape interaction was significant in some cases.

The okra leaf shape character, as an average of varieties and locations, caused a significant reduction in the incidence of boll rot in comparison with normal leaf cotton. It was associated with a significant increase in yield, earliness, lint percentage and micronaire value, and a substantial increase in fruiting rate. Okra leaf shape had no effect on boll weight, fiber length, fiber length uniformity, or fiber strength, but caused a reduction in fiber elongation and total leaf area.

A mixed population of okra leaf and normal leaf plants in a 1:1 ratio was investigated. The mixed population was found to have no advantage over the pure populations of the contrasting leaf shapes.

Key Words: Earliness • Lint percentage • Boll weight • Fiber fineness • Fiber strength • Fiber elongation • Leaf surface area • Isogenic populations

² Formerly Associate and Graduate Student (now Assistant Agronomist, Mississippi Agricultural Exp. Sta., State College, Miss., 39762); Professor, Agronomy Department, Louisiana State University, Baton Rouge, La., 70803; Associate Professor, Northeast La. Exp. Sta., St. Joseph, La., 71366; and Assistant Professor, Dean Lee Agricultural Center, Alexandria, La., 71301, respectively

Received for publication December 12, 1968.

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