S. Rajeshwari ¹, A. Santhi ¹, C. V. Sivakumar ¹

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

Abstract

Studies were conducted in a greenhouse to assess the role of organic amendments, Trichoderma viride Pers. ex Fr. and carbofuran in the population of nematode trapping fungus. Arthrobotrys cladodes var. macroides (Drechsler, 1944) and plant parasitic nematodes and their interaction on growth of tomato. Application of organic amendments enhanced the population of the nematophagous fungus. Increase in density of the nematode trapping fungus, A. cladodes var. macroides was highest in a loamy soil ameliorated with 2 per cent Farm Yard Manure (FYM) or neem cake. Carbofuran at 15 mg a. i./pot gave the maximum reduction in the population of Helicotylenchus dihystera, Tylenchorynchus capitatus and Xiphinema basiri and was followed by FYM, neem cake and T. viride. The plant growth was significantly increased in combination treatments consisting of FYM + carbofuran followed by neem cake + carbofuran. Application of the organic amendments reduced the efficacy of carbofuran.

Keywords

Arthrobotrys cladodes Var. macroides, Carbofuran, Organic Amendments, Trichoderma viride.

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A. Santhi ¹, C. V. Sivakumar ¹

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

Abstract

Studies were conducted in greenhouse to assess the biocontrol potential of three strains of Pseudomonas fluorescens (Migula) viz., Pf-1, Pf-2 and Pf-3 at high (8 × 10⁸ cfu/g) and low (4 × 10⁸ cfu/g) dosages, as seedling bare ischolar_main dip treatment against Meloidogyne incognita (Kofoid and White, 1919) Chitwood, 1949 on tomato. The plant growth was significantly better in all the treatments with the bacterium. The strain Pf-1 performed significantly superior to the other two strains at both the dosages. The bacterial treatment also reduced the level of infestation by the nematode, which was dosage dependent. The strain Pf-1 was superior to the other two. The nematode suppressing ability of the bacterial strains appeared to be related to their ischolar_main-colonising ability.

Keywords

Meloidogyne incognita, Plant Growth Promoting Rhizobacteria (PGPR), Pseudomonas fluorescens, Tomato.

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