Greenhouse Evaluation of Verticillium, Fusarium, and Root Knot Nematode on Cotton
1972
Bugbee, W. M. | Sappenfield, W. P.
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.
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