Bioefficacy of fungicides, bio-control agents and botanicals against leaf spot of turmeric incited by Colletortricum capsici

摘要

Efficacy of ten fungicides with three different concentrations, that is, 500, 1000 and 1500 ppm were studied?in vitro?against?Colletortricum capsici?by poisoned food technique. Results revealed that Propiconazole was significantly superior to all other fungicides by inhibiting (100%) growth followed by Hexaconazole (96.55%) and Chlorothalonil (86.78%) over control after 10 days of incubation. Biocontrol agent namely,?Trichoderma viride,Gliocladium?spp.,?Trichoderma harzianum,?Trichoderma koningii?and?Pseudomonas fluorescens?were evaluated for their efficacy against?C. capsici?in vitro. Percent inhibition of the test pathogen ranged from 41.18 to 53.33%.?T. harzianum, was found to be the most effective antagonist which caused growth inhibition of 53.33%. It showed the possibility of the most ecofriendly and inexpensive method of control of the leaf spot disease. A total of eleven plant extracts which were locally available were evaluated?in vitro?against?C. capsici?and were tested applying poisoned food technique. Overall percent inhibition of growth of the fungus ranged from 7.30 to 76.15%.?Polyalthia?longifoliarecorded maximum inhibition of 76.15% at 15% concentration followed by rhizome extractCurcuma longa?with 66.88% and?Allium cepa?63.96%. Whereas,?Aegale marmelos?andParthenium?hysterophorus?showed minimum mean inhibition of 20.86 and 28.66%, respectively. The results from pot culture experiment revealed that Propiconazole (0.05%) was found to be significantly superior among all the treatments. The next best fungicide was Hexaconazole (0.10%) and Chlorothalonil (0.15%). Among plant extracts,?P. longifolia(15%) was superior over all other plant extracts. In the case of biocontrol agents,?T. viridewas superior over?T. harzianum?in pot culture experiment.