Management of root and collar rot (Macrophomina phaseolina (Tassi) Goid.) of OKRA (Abelmoschus esculentus (L.) Moench) through bioagents, oil cakes and fungicides

Abstract

The in vitro evaluation of five different bioagents against Macrophomina phaseolina, incitant of root and collar rot of okra, revealed that Trichoderma viride was the most effective with highest growth inhibition (73.06%) followed by T. harzianum (68.89%). Among the oil cake extracts, neem cake extract had highest growth inhibition with 33.89 and 38.89 per cent at 10 and 20 per cent concentration, respectively. Among the different fungicides tested, tebuconazole had cent per cent growth inhibition at both concentration followed by carbendazim 12% + mancozeb 63% with 89.63 and 91.86 per cent growth inhibition at 500 and 1000 ppm, respectively. Out of the eight different treatments tested in vivo through pot culture studies, seed treatment with T. viride combined with soil application of T. viride enriched FYM recorded the least mortality percentage (26.55%) and highest vigour index (1643).