जर्नल ऑफ़ प्लांट पैथोलॉजी एंड माइक्रोबायोलॉजी

अमूर्त

Effect of Combined Inoculation of Xanthomonas and Meloidogyne Pathogens on the Development of Tomato Root Knot Disease

Musarrat Ramzan Arain

Bacteria (Xanthomonas campestris pv. vesicatoria) and root-knot nematode (Meloidogyne incognita) independently can damage and cause considerable damage to tomato (Solanum lycopersicum L.). In a disease complex, interrelationship of 2 or more pathogenic species can produce different symptoms on the same host plant. Generally simultaneous occurrence of these pathogens in a field can infect hosts plant at the same time. During development of a disease complex pathogens could influence and/or suppress each other, through synergism and or antagonism respectively. In this study the pathogens (Meloidogyne incognita and Xanthomonas campestris pv. vesicatoria), were used to determine how co-occurrence affects development of pathogens and disease severity, and define prerequisites for interrelation between pathogens.

Root knot infection did not occur when tomato plants were inoculated with Xanthomonas campestris 1 week prior to inoculation with Meloidogyne incognita. When M. incognita was inoculated 1 week prior to X. campestris, infection by root knot nematode was highest compared to bacterial spot incidence in susceptible plants. Simultaneous inoculation of M. incognita + X. campestris caused severe gall production with moderate severity of bacterial spot disease. The reproduction of 1 pathogen can be affected by a subsequent inoculation of other pathogen. It is suggested that bacterial spot disease enhances the development of root knot disease.