Pathological studies on fungi associated with diseased safflower seedlings and their control [electronic resource].

Includes references.

saaffiower diseased plants, showing typical symptoms of damping-oft root and stem rot, wilt and/or rust diseases, were collected from Behera and Giza governorates fOT isolation the associated microorganisms. Isolated fungi were carefully purified and identified as well as their frequencies were calculated. Fusarium oxysporum, Pythim sp.. Rhizoctonia solani, Sclerotinia sclerotiorum were only isolated from Giza. Meanwhile.. Fusarium soani and Phytophthora sp. were isolated ooly from Behera. Macrophomina phaseo1ina was widespread and isolated from the two governorates with high frequency. Puccinia carthami, the causa) of safflower rust was encountered elsewhere. Pathogenicity tests were performed to throw light on the relative importance of the tested fungi to cause the aforementioned diseases. F. oxysporum caused damping-off and vascular wilt symptoms, P. carthami showed also damping-off and the seedling rust phase. the other fungi were able to colonize saffower roots and cause damping-off and root rot symptoms. The results showed that the amount of the disease was effected by the tested fungi and the sowing date(s).-In most cases. sowing at November 2nd recorded the intermediate amounts of infection and the best seed germination. One biocide, viz. Biocontrol; one resistance inducer, viz. Biomycin in addition to three fungicides, viz. Moncut, Vitavax.-T and Rizolex-T were tested in vivo for their ability 10 control safflower damping-off and root rot caused by the tested fungi i.e. M. phaseolina. R. solani and F. solani. The obtained data revealed that none of the evaluated formulations was able to prevent entirely infection with any of the tested fungi. The best control of M. phaseolina was given by seed treatment with Biomycin, Vitavax- T and Rizolex-T. R. solani was cootrolled by Biomycin and Rizolex-T. Meanwhile, Vitavax-T, Biomycin and Rizolex-T were the best treatments against F. solani.

Summary in Arabic.

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