Fusarium oxysporum f. sp. phaseoli as cause of Fusarium wilt of snap beans and beans in Yugoslavia
1989
Balaz, F. (Poljoprivredni fakultet, Novi Sad (Yugoslavia))
The result of our investigation showed that the fungus isolated from the stems of typically withered samples of snap beans and beans is a species of Fusarium oxysporum f.sp. phtiseoli Kendrik and Snyder. The symptoms observed in field have been reproduced in the conditions of inoculation. The symptoms of the disease are a retarded growth, chlorosis, the necrosis of vascular tissue, leaf drying and shedding and the necrosis of roots and stems. The infected plants invariably perish. The fungus forms an abundant colony with pale pink aerial mycelia. The dimensions of the micro and macroconidia are 7,5 x 2,8 nm and 33,5 x4,0 nm, respectively, and of the chlamydospores 6,2 x 8,5 nm. The fungus develops best on the synthetic acid medium. The optimum temperature for the development of the fungus is 25'C. The largest number of the investigated snap beans and beans varieties demonstrated sensitive to medium sensitive reaction to F. oxysporum f.sp. phaseoli.
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