Integrated disease management for tomato in island ecosystem of Andaman

Abstract

Integrated disease management modules were developed for the management of disease complex in tomato during 2008-09, 2009-10 and 2010-11, under Island ecosystem of Andaman and Nicobar Islands. All isolates of biocontrol agents significantly parasitized the test pathogens in vitro but the isolate Tv-CARI-73 was most effective against all the pathogens, viz., Pythium sp., Phytophthora sp., Rhizoctonia solani, Sclerotium rolfsii and Fusarium oxysporum f.sp. lycopersici followed by Th-CARI-50, Tv-CARI-85 and Th-CARI-70. In IDM module - I, T10 (combination of seed treatment + seedling dip + soil application of biocontrol agents) treatment was most effective in reduction of disease incidences in tomato (except bacterial wilt) followed by T11, T12, T11 and T9. This treatment was also recorded with highest yield (227.5 q/ha). In IDM module - II, T7 (integration of bioagents with the fungicides) treatment was recorded with highest percent reduction in incidence of all diseases (86.0% bacterial wilt, 56.2% leaf curl, 76.4% basal stem rot and 74.8% fusarial wilt) and increase in yield (75.3%) followed by T1, T9, T8, T13 and T14. Similarly, T2 treatment in IDM module - III, was most effective in reduction of disease incidence (89.9% bacterial wilt, 56.5% leaf curl, 77.0% basal stem rot and 75.7% fusarial wilt) and corresponding yield increase (83.6%) of tomato, followed by T3, T4 and T1 treatments.