Biological control of stem bleeding disease caused by Thielaviopsis paradoxa in coconut Rao V. Govardhan1,*, Neeraja B.1, Rao N.B.V. Chalapathi1, Kireeti A.1, Anoosha V.1, Koteswarao G.1, Hegde Vinayak2, Bhat Ravi2, Kumar K.C. Kiran3, Srinivasulu B.1 1AICRP on Palms, Horticultural Research Station, Dr. Y.S.R. Horticultural University, Ambajipeta - 533 214, Andhra Pradesh, India 2ICAR-Central Plantation Crops Research Institute, Kudlu. P.O.-671124, Kasaragod, Kerala, India 3AICRP, HREC, Arsikere-573103, Hassan, Karnataka, India *e-mail: govardhanrao139@yahoo.com
Online Published on 11 January, 2024. Abstract Stem bleeding disease caused by Thielaviopsis paradoxa is also one of the important diseases in coconut in Andhra Pradesh. Bio efficacy of native fungal and bacterial bioagents on stem bleeding pathogen Thielaviopsis paradoxa under in vitro conditions revealed that Trichoderma asperellum [Ambajipeta] was significantly superior with 79.17% growth inhibition followed by T. reesei [Ambajipeta] with 78.33%. Field evaluation of bio-control agents against Stem bleeding disease in coconut indicated that the cake application of T. harzianum and T. reesei formulation completely brought down the disease index by 100 per cent within 50 days of cake application. Paste application of bioagents viz., T. harzianum, T. reesei, and chemical fungicide copper oxychloride application also substantially reduced the disease. Top Keywords Stem bleeding disease, Coconut, Thielaviopsis paradoxa, Trichoderma coir pith cake, Biocontrol. Top |