Abstract                 Volume:3  Issue-4  Year-2016          Original Research Articles

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Comparative Bioefficacy of Fungicides and Trichoderma spp. against Pestalotiopsis theae, Causing Grey Blight in Tea (Camellia sp.): An In Vitro Study
Kishor Chand Kumhar*, Azariah Babu, Mitali Bordoloi, Priyanka Benarjee and Hirakjyoti Rajbongshi
Tea Research Association, North Bengal Regional Research & Development Centre, Nagrakata, Jalpaiguri - 735 225, West Bengal, India
*Corresponding author
Abstract:

The grey blight, caused by Pestalotiopsis theae is a serious problem in almost all tea growing regions of India. A large number of tea cultivars were found to be susceptible to this disease. Evaluation of four selected fungicides (carbendazim 12% a.i + mancozeb 63% a.i.,  hexaconazole 5 EC, copper oxychloride 50 WP and copper hydroxide 77 WP) have been found effective in suppressing the pathogen to the considerable degree under in vitro conditions. Results indicated that, maximum control (70.8%) was achieved in the case of combi fungicidal formulation (carbendazim 12% a. i. + mancozeb 63% a. i.) followed by hexaconazole 5 EC and copper hydroxide 77 WP and copper oxychloride 50 WP, respectively. Effort has been made to evaluate the effectiveness of the indigenous Trichoderma viride (KBN-24) and T. asperellum (KBN-29) in inhibiting the mycelial growth of P. theae in dual culture method and the results indicated significant inhibition of the pathogen. Results on the compatibility study indicated that the tested fungicides adversely affected the growth of T. viride to varying degree. The maximum inhibition (79.0%) was noted in case of combi fungicide formulation followed by copper oxychloride (75.8%) and hexaconazole (70.4%). Thus the results of this current investigation highlighted the fact that the local Trichoderma isolates were found effective in controlling the targeted phytopathogen. However, use of such fungicides soon after the application of Trichoderma formulation, should be discouraged to have a better control of the disease.

Keywords: Fungicide compatibility,Pathogenicity,Pestalotiopsis theae,Tea plant,Trichoderma asperellum,Trichoderma viride
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How to cite this article:

Kumhar, K.C., Babu, A., Bordoloi, M., Benarjee, P., Rajbongshi, H., 2016. Comparative bioefficacy of fungicides and Trichoderma spp. against Pestalotiopsis theae, causing grey blight in tea (Camellia sp.):  An in vitro study.Int.J.Curr.Res.Biosci.Plantbiol. 3(4): 20-27. doi: http://dx.doi.org/10.20546/ijcrbp.2016.304.004