Pathological studies on tomato early blight
2009
Ahmed, A.A.M. | Atia,, M.M. | Abou-Zaid, M.I. | Tohamy, M.R.A.
Early blight disease caused by Alternaria solani was wide spread in El-Sharkia governorate during 2004-2005 and 2005-2006 growing seasons. The highest percentage of disease incidence was recorded in El-Ebrahimia district while the lowest one was recorded in Abo- Hammad district during two growing seasons. The causal organism was isolated from infected leaf and fruit samples (exhibited typical symptoms of early blight) collected from different localities mentioned before, and identified as A. solani. Growth of A. solani on leaves and fruits of tomato agar media, then exposed to Ultra-Violet irradiation (UV) was the best method to obtain A. solani spores. All tested isolates of A. solani were found to be pathogenic at different degrees against tomato plants Gs cv. Hynez tomato cv. was the most resistant tested cvs., while, Gs cv. was the most susceptible one. On the other hand, the other tested cultivars were moderately susceptible to be infect with A. solani. Old tomato leaves were more susceptible to be infect by A. solani than young one. Also, direct seed cultivation method enhanced tomato plants to be infect with A. solani than the transplanting method. The fungicide Mmancozeb reduced both mycelial growth and /or spore germination of A. solani in vitro as well as disease severity and prcentage of infection in vivo followed by Cure-plus and Vacomilpius, respectively.
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