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V. Jayalakshmi ¹, K. Sivaprakasam ², K. Seetharaman ²

Affiliations
1 Tapioca and Castor Research Station (TNAU), Yethapur, Salem (dt), Tamil Nadu, IN
2 Department of Plant Pathology Agricultural College and Research Institute (TNAU) Madurai 625104, Tamil Nadu, IN

Abstract

Pseudomonas fluorescens native isolate and Pseudomonas fluorescens strains of pf 1, pf 27 effectively inhibited the growth or Rhizoctonia solani. Seed treatment with Pseudomonas fluorescens native isolate and Pseudomonas fluorescens strains of pf1 (4 x 10⁹cfu/ml) recorded the maximum germination (98.66% and 86.66%), shoot length (20 and 18cm), ischolar_main length (15 and 13 cm), dry matter production (60 mg and 57 mg) and vigor index (1973.2 and 1618) compared to control.

Keywords

Growth Inhibition, Pseudomonas fluorescens, Rhizoctonill solani, Rice, Sheath Blight.

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C. Kurvilla Jacob ¹, K. Sivaprakasam ¹, R. Jeyarajan ¹

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

Abstract

Eight fungal antagonists and eight leaf extracts were evaluated in vitro against Pythiun aphanidermatum (Edson) Fitzpatrick and the effective treatments selected for pot culture evaluation. Pot culture studies with brlnjal seeds showed that Eucalyptus leaf extract as seed soak treatment for 30 minutes prior to sowing was effective against P. aphanidermatum. Seed treatment with Trichoderma harzianum at 5 × 10⁹ conidia per ml, Lactisaria arvalis at 0.66 mg sclerotia per ml and Captan at 0.25 per cent also effectively controlled P. aphanidermatum.

Keywords

Plant Extracts, Fungal Antagonists, Biological Control, Damping off Brinjal.

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G. Alagarsamy ¹, K. Sivaprakasam ¹

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

Abstract

Pelleting of cowpea seeds with Trichoderma viride Pers: fr. either alone or in combination with carbendazimm inhibited the growth of Macrophomina phaseolina Tassi (Gold.) in vitro. The treatment increased the germination and reduced the post emergence mortality under pot culture conditions. Carbendazim did not show any adverse effect on the antagonists T. viride and T. harzianum Rifal under in vitro and also in pot culture studies. Seed pelleting with carbendazim in combination with antagoinst reduced the seedling mortality besides enhancing the growth characteristics like shoot length, ischolar_main length and dry matter production.

Keywords

Trichoderma viride, T. harzianum, Carbendazim, Growth Inhibition, Macrophomina phaseolina, Mortality, Growth Characters.

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