Evaluation of botanicals, bio agents and fungicides against stem bleeding of coconut caused by Thielviopsis Paradoxa under in vitro conditions

Stem bleeding disease caused by Thielaviopsis paradoxa is one of the major diseases of coconut in almost all the coconut growing regions of Karnataaka. Bioefficacy of five botanicals viz. Allium sativa, Nerium olender, Tinospora cordifolia, Osimum sanctum and Aegle marmelos, Seven isolates namely Trichoderma viridae (GKVK), Trichoderma harzianum (GKVK), Trichoderma asperillum (GKVK), Trichoderma harzianum (HRS, NBAII, KRN and MYS) and ten systemic and three contact fungicides were evaluated under in vitro conditions against Thielviopsis paradoxa. Among the five botanicals evaluated only Allium sativa found significantly superior and showed complete inhibition of the growth of the pathogen at 15% and 20% concentration followed by Osimum sanctum found effective and has recorded eighty five per cent inhibition at 20% concentration.