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S. Ramakrishnan ¹, C. V. Sivakumar ¹, K. Poornima ¹

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

Abstract

Field experiments were conducted with rice cvs. C043, DT36 and ADT 38 during Kuruvai (June-September); Samba (August- January), and Navarai (January-April) seasons, respectively, to evaluate the efficacy of plant growth promoting rhizobacterium, Pseudomonas fluorescens Migula strain Pf-1 available with Tamil Nadu Agricultural University, Coimbatore, as commercial formulation in the control of the rice ischolar_main nematode Hirschmanniella gracilis (de Man) Luc & Goodey. The biocontrol agent was evaluated as seed treatment and nursery soil application separately and either with or without soil application of carbofuran 3G and compared with soil application of carbofuran 3G @ 1.3 g a. i./m² and an untreated control for the management of the nematode. Application of the biocontrol agent as seed treatment at a dosage of 10 g/kg of seed was superior to all the treatments. Maximum bacterial colonization and nematode suppression was observed in plants treated with P. fluorescens as seed treatment and it increased yield by 13 per cent.

Keywords

Heterodera spp., Hirschmanniella gracilis, Meloidogyne incognita, Rice.

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V. Suseela ¹, K. Poornima ¹

Affiliations
1 Department of Biochemistry, Karpagam University, Coimbatore - 641 021, IN

Abstract

Coscinium fenestrafum Colebr. (menispermaceae), commonly known as tree turmeric, grows widely in the Western Ghats (India) and Sri Lanka, The plant has been mainly used for treating diabetes mellitus in the traditional Ayurvedic and Siddha systems of medicine.

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K. Poornima ¹, K. Gopala Krishnan ¹, S. Dinesh Kumar ²

Affiliations
1 Department of Electronics, S.N.R. Sons College, Coimbatore - 641006, Tamil Nadu, IN
2 Department of Physics, Government Arts College, Udhagamandalam - 643 002, Tamil Nadu, IN

Abstract

Objectives: Transparent Zinc oxide (ZnO) thin films to be prepared and annealed on the Indium tin oxide - ITO substrate using simple solution gel dip coating technique. Methods/Analysis: Thin films have been carried out by different characterization techniques such as X-ray diffractometer - XRD, Scanning Electron Microscopy - SEM, Energy dispersive analysis - EDAX, UV spectroscopic and FTIR spectroscopy. In the contemporary work, the ZnO films have been prepared on ITO substrate by dipping in the solution and annealed at the 300 °C. Findings: XRD pattern reveals that the annealed thin film is standard wurtzite zinc oxide hexagonal structure. SEM Morphological studies have been investigated using scanning electron microscopy and the elemental analysis confirmed by EDAX. Optical measurement shows the greatly transparent and the thin films are direct energy gap Eg of 3.70eV. FTIR confirm the metal oxide bond in the molecular structure. Novelty/Improvement: This research work helps for the future researcher’s preparation of undoped Zinc oxide thin film for solar cell applications.

Keywords

ITO Substrate, Sol-Gel Method, ZnO Thin Film

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P. S. Kavitha ¹, T. N. Balamohan ¹, K. Poornima ¹, I. Van den Bergh ², D. De Waele ³

Affiliations
1 Department of Fruit Crops, Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore-641 003, IN
2 International Network for the Improvement of Banana and Plantain - Asia and the Pacific, c/o IRRI Khush Hall, Los Banos, Laguna 4031, PH
3 Laboratory of Tropical Crop Improvement, Catholic University Leuven (K.U. Leuven), Kasteelpark, Arenberg 13, 3001 Leuven, BE

Abstract

The reaction of twenty-four new synthetic banana hybrids to Pratylenchus coffeae was studied under artificially inoculated pot conditions. Two banana hybrids, H-04-05 and H-04-06 were found to be resistant and ten hybrids, H-04-01, H-04-03, H-04-04, H-04-07, H-04-09, H-04-11, H-04-16, H-04-19, H-04-21 and H-04-24 were found to be tolerant to the lesion nematode, Pratylenchus coffeae and the remaining were rated as susceptible.

Keywords

Resistance, Banana, Hybrids, Pratylenchus coffeae.

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K. Poornima ¹, R. K. Walia ²

Affiliations
1 Department of Nematology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 ICAR-All India Coordinated Research Project (Nematodes), New Delhi 110 012, IN

Abstract

Horticultural nurseries are often contaminated with nematodes, especially the ischolar_main-knot nematode, Meloidogyne spp. Nematodes are concealed in the ischolar_mains of planting materials (plantlets in polybags). Due to unawareness about nematode infection in planting materials among nurserymen, growers and horticulture field staff, the nematodes have spread across India. The infected plants often do not grow well and slowly succumb to nematode infection on ischolar_mains that is accentuated due to secondary attack by fungal (Fusarium spp.) pathogens. Recently, this problem has cropped up in a big way in guava plantations across the country and a suspected exotic species, Meloidogyne enterolobii (the guava ischolar_main-knot nematode) has been intercepted in 11 states. Methods to contain nematode infection in nurseries and prevent further spread through planting material are suggested in this study.

Keywords

Horticultural Nurseries, Dissemination, Guava, Planting Materials, Root-Knot Nematode.

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