DEVELOPMENT OF IDM MODULE FOR Tomato leaf curl virus AND ALTERNARIA BLIGHT IN TOMATO
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Date
2019-08-17
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK, BENGALURU
Abstract
Tomato leaf curl disease (ToLCD) caused by Tomato leaf curl virus (ToLCV) and alternaria blight caused by Alternaria solani are the most threatening diseases for tomato production worldwide. Among the different plant defence activators and antibiotics tested, foliar application of silicic acid @ 4 mL L-1 and foliar application of LBD-1 @ 2 mL L-1 were found effective in reducing per cent incidence (PI), per cent disease index (PDI) of ToLCD and preference of whiteflies. The incidence and severity of ToLCD were reduced when the treatments were imposed to both source plants and healthy plants than the treatments imposed either to source plants or healthy plants. Amongst the different plant defence activators evaluated against A. solani, potassium phosphite @ 2 g L-1, silicic acid @ 4 mL L-1 and LBD-1 @ 2 mL L-1 were found effective in reducing growth of alternaria in vitro and in vivo. Two modules: M1 (newly designed module) and M2 (recommended package of practice) were evaluated for their field efficacy in reducing the incidence and severity of ToLCD and alternaria blight at two locations viz., Kadur and GKVK, Bengaluru. M1 module was consistently effective in reducing the incidence and severity of ToLCD, number of whiteflies per compound leaf and severity of alternaria blight throughout the study period at both the locations. Module M1 was found superior over M2 by recording highest gross and marketable yield of tomato.