Pathological studies on Alternaria brassicicola and Phoma lingam leaf spot diseases on canola plants under greenhouse conditions [electronic resource].

Includes references.

Black leaf spot and blackleg diseases of canola were studied during three successive growing seasons (2010 /2011, 2011/2012 and 2012/2013) in four Governorates (Giza, Ismaillia, Gharbia and Sharkia). The causal organisms were isolated from infected leaf samples, identified as Alternaria brassicicola (Sch.) Wiltshire and Phoma lingam(Tode) Desm and inspected for their pathogenic potentiality. Pactol was the most resistant canola cultivar while, Serw 4 was very susceptible one. Radish (Raphanus sativus L.) was highly susceptible host to be infect with the tested fungal genera compared with the other tested ones. Level of N1P1K1 fertilizer reduced disease incidence and severity. All tested bioagents reduced disease severity using attached leaf technique two days after inoculation. Trichoderma harzianum Rifai was the most effective in reducing severity of altemaria black spot disease. While T. viride Pers. reduced severity of blackleg disease. On the other hand, Bacillus subtilis reduced canola leaf spot disease caused by A brassicicola and P. lingam The tested fungicides reduced severity of canola disease using attached leaf. Key words: Alternaria brassicicola, Phoma lingam, canola, black spot, blackleg.

Summary in Arabic.

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