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Published in Crop Sci 12:112-114 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Greenhouse Evaluation of Verticillium, Fusarium, and Root Knot Nematode on Cotton1

W. M. Bugbee and W. P. Sappenfield2

Cotton (Gossypium hirsutum L.) plants 3 or 6 weeks old were inoculated with Fusarium oxysporum, f. sp. vasinfectum, Verticillium albo-atrum, or Meloidogyne incognita acrita, individually and in all combinations, to determinean inoculation procedure that would permit an evaluation for multiple disease resistance. Four cotton varieties of known disease reaction were used for comparison. Differences in varietal response to F. oxysporum were best expressed in the younger plants, and varietal differences to V. albo-atrum were best expressed in older plants. Although varietal differences in wilt response were less clear when both fungi were inoculated simultaneously, these differences were more evident in the younger plants.

Most stunting occurred when plants growing in rootknot nematode-infested soil were inoculated with either or both pathogens. Good differentiation of varietal resistance was not apparent. Only the most susceptible and most resistant varieties could be distinguished when infected with all 3 pathogens.

Key Words: Gossypium hirsutum L. • G. barbadense L. • Multiple-resistance

1 Joint contribution, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, and the Missouri Agricultural Experiment Station, Portageville. Journal Series Number 7042.

2 Plant Pathologist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, and Professor, Department of Agronomy, Missouri Agricultural Experiment Station, Portageville. Current address of senior author: Department of Plant Pathology, North Dakota State University, Fargo, N. D. 58102.

Received for publication May 22, 1971.




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