Evaluation of Botanicals, Bio Agents and Fungicides against Stem Bleeding of Coconut caused by Thielviopsis paradoxa under invitro Conditions

In vitro and Field Efficacy of Native Biocontrol Agents on Stem Bleeding Pathogen of Coconut Thielaviopsis paradoxa

“…It was observed that significantly maximum growth inhibition of Thielaviopsis paradoxa were observed with Trichoderma viride to a percent inhibition of 69.35 followed by Pseudomonas fluroscence to 69.32 % (Plate 3a & Plate 3b).The least growth inhibition of Thielaviopsis paradoxa to 62.90 % was observed with Trichoderma harzianum. The results are in corroboration with earlier workers who reported the potential of biocontrol agent against coconut pathogens(Jayaratne et al, 2015; Tapwal1 et al., 2011) Sudarshan et al, 2019. reported that Trichoderma viridae was found to be most effective on Thielaviopsis paradoxa with 61.62% inhibition followed by T. harzianum and T. virens with 60.80 and 59.49 per cent inhibition respectively.…”

“…drenching with calixin 0.1% (Radhakrishnan, 1990) and root feeding with Bavistin 5% or Calixin 5% (Ramanujam et al, 1993), have been found to reduce the disease to some extent. Sudarshan et al(2019) reported that Difenoconazole 25% EC @ 0.1%,Propiconazole 25% EC@0.1%, Tebuconazole 25.9% EC @ 0.15% and Thiophanate Methyl 70%WP @ 0.28% has recorded cent per cent inhibition. Though chemical treatments inhibit the pathogen, but biological control is an eco-friendly, longlasting, highly effective method for the elimination of soil borne pathogens and a good alternative for the chemical and physical treatments.…”