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To check the possibility of double infection of tomato plants by root-knot nematodes (RKN), Meloidogyne spp., and tomato wilt bacterium, Ralstonia solanacearum, pot experiments was conducted in the green house, department of Plant Pathology, the University of Agriculture Peshawar. Four treatments consisting bacteria and/or nematode (alone or in combination) were investigated on five tomato varieties i.e. Lyreka, Money-maker, Red-stone, Rachna and Reo-Grand. Results stated that when RKN was inoculated together with R. solanacearum, severity of bacterial wilt enhanced while the yield was reduced significantly. Maximum number of plants (96%) survived when plants were not inoculated with bacterium. However, with double-inoculation 77.33% plant survived. Similarly, maximum (3.33) disease ratings were recorded when plants were double-inoculated. Yield was reduced from 2.44 kg.plant-1to its minimum (0.54 kg.plant-1) when plants were double-inoculated. It was concluded that that RKN having a synergistic effect on bacterial wilt diseases, if inoculated together with R. solanacearum and it is recommended RKN should be managed properly to reduce the impact of bacterial wilt disease in tomato.
Keywords: Bacterial wilt; R. solanacearum; Root-knot nematode; Tomato