A. Muthukumar ¹, R. Bhaskaran ²

Affiliations
1 Department of Plant Pathology, Annamalai University, Annamalainagar 608 002, Tamil Nadu, IN
2 Coconut Research Station, Veppankulam, Tamil Nadu Agricultural University, Coimbatore, IN

Abstract

Pseudomonas fluorescens isolate (1-12) were collected from the rhizosphere soil and tested for their efficacy against Rhizoctonia solani causing sheath blight of rice and Pythium sp, causing damping-off of chilli. Among the 12 isolates, P. fluorescens 3 and 4 were very effective in inhibiting the mycelial growth of R. solani and Pythium sp. All the 12 isolates of P. fluorescens were tested for (he production of siderophore, salicylic acid and HCN. The isolates of P. fluorescens 3 and 4 alone showed higher production of siderophore, salicylic acid and hydrogen cyanide

Keywords

Hydrogen Cyanide, Pseudomonas fluorescens, Pythium sp., Rhizoctonia solani, Salicylic Acid, Siderophore.

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A. S. Krishnamoorthy ¹, R. Bhaskaran ¹

Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN

Abstract

A pot culture experiment was conducted to find out the efficacy of antagonists in the control of damping-off disease of tomato caused by Pythium indicum Balakrishnan. Soil inoculation with Trichoderma viride Pers., T. harzianum Rifai, and Laetisaria arvalis Burdsall, gave good control of the pathogen and the treated pots recorded 78.2, 70.9 and 72.2 per cent seed germination respectively as against 19.3 per cent in the control. Seed treatment with T. viride, T. harzian um and L. arvails was also found to be equally good. The results obtained were comparable to soil drenching with fungicides like fenaminosu1f, copper oxychloride and seed treatment with captan or thiram. However, improved seedling vigour was noticed in the treatments with antagonists than with fungicides.

Keywords

Tomato, Damping-Off, Biological Control, Seedling Vigour.

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