Impact of fungicides and biocontrol agents in managing peduncle blight of tuberose caused by Lasiodiplodia theobromae (Pat.) Griffon and Maubl.
Peduncle blight, hitherto an unknown disease, was found to be a major limiting factor to the cultivation of tuberose, as the disease incidence was noticed up to 42.60% in pockets of Madurai district. Though, Lasiodiplodia theobromae is an ubiquitous pathogen, its occurrence on tuberose is a new record. The fungus induced confounding symptoms which included blossom blight, peduncle blight and leaf blight at tips as well. The causal agent of the disease was identified as Lasiodiplodia theobromae. The efficacy of fungicides and biocontrol agents effective in in vitro was evaluated in pot culture experiment to manage peduncle blight of tuberose. Foliar application of carbendazim 0.1% at 60, 90 and 110 Days After Planting (DAP) was found to be highly effective in reducing the disease incidence up to 95.50%. Among the biocontrol agents, bulb treatment at 10 g kg-1 followed by three foliar sprays at 0.5% on 60, 90 and 110 DAP using the combination of Tv1, Pf1 and Bs10 was equally effective as that of Pf1 and Bs10 with 65.68 and 64.45% disease reduction, respectively.