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Effects of Row and Plant Spacings on Verticillium Wilt of Cotton¹

The effects of row and plant spacings on percent Verticillium wilt (Verticillium albo-atrum Reinke and Berth.) in ‘Gregg 35,’ a wilt-susceptible cotton (Gossypium hirsutum L.) adapted to a wide range of row and plant spacings, were studied in single- and double-row planting patterns. Percent wilt was decreased slightly in double-row and significantly in single-row patterns by close row spacings. In both planting patterns percent wilt decreased as plant populations (seeding rates) increased from low to medium levels, but percent wilt remained constant or decreased slightly at higher plant populations. The interaction of row widths x seeding rates was significant only for the single-row patterns.

Key Words: Gossypium hirsutum • Verticillium albo-atrum • Seeding rates • Plant populations • Single- and double-row plantings

² Respectively, Research Plant Pathologist, PSRD, ARS, USDA; and Agricultural Engineers, AERD, ARS, USDA, the Texas A&M University Agricultural Research and Extension Center at Lubbock 79401.

Received for publication January 27, 1972.