Neelamegam, R.

• In vitro Evaluation of Fungal and Bacterial Antagonists against Colletotrichum falcatum Went

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Authors

A. Sangeetha ¹, S. Mohan ¹, R. Neelamegam ²

Affiliations
1 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai 625104, Tamil Nadu, IN
2 Department of Botany, S. T. Hindu College, Nagercoil 629002, Kanyakumari District, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 23, No 3 (2009), Pagination: 333-336

Abstract

Red rot of sugarcane caused by Colletotrichum falcatum is a major constraint in sugarcane production causing substantial loss in yield and quality. Use of biocontrol agents is an effective, eco-friendly and non-hazardous possibility for red rot management. In the present investigation potential bio-control agents were screened against C. falcatum on sugarcane. Among the 15 species/ isolates of bacterial and fungal antagonistic organisms screened against C. falcatum in dual culture, Pseudomonas fluorescens isolate-1 and Trichoderma viride isolate-3 showed maximum inhibitory effect on C. falcatum. These two isolates identified as more potential biocontrol agents in the present investigation can be exploited to control red rot of sugarcane.

Keywords

Antagonist, Colletotrichum falcatum, Dual Culture, Red Rot, Sugarcane.

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References

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• In vivo Effect of Antagonistic Treatments on Red Rot Disease Incidence, Yield and Quality Parameters of Sugarcane

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Authors

A. Sangeetha ¹, R. Neelamegam ², S. Mohan ¹

Affiliations
1 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai 625104, Tamil Nadu, IN
2 P.G. and Research Department of Botany, S. T. Hindu College, Nagercoil 629002, Kanyakumari District, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 23, No 4 (2009), Pagination: 443-448

Abstract

Experiments were carried out to develop an effective biocontrol method against sugarcane red rot disease under field conditions in sugarcane var. CoC-671. Integrated approach as sett treatment + foliar spray + soil application of the antagonistic organism Pseudomonas fluorescens recorded the lowest disease incidence (10.37 per cent), higher germination (77.67 per cent), more number of tillers (2.67/ha), economic shoots (1.95/ha) and increased yield (47.80tonnes/ha), highest brix value (21.27 per cent), sucrose (18.67 per cent) and commercial cane sugar (10.86 per cent) in the sugar cane var. CoC-671.

Keywords

Colletotrichum falcatum, Sugarcane, Red Rot, Sett Treatment, Foliar Spray.

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References

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• Senthil, N., Jayaraj, J. and Shanmugam, V. 2000. Evaluationof fungal and bacterial antagonists against(Colletotrichum falcatum Went) causing red rot ofsugarcane. Indian Sugar, 50: 423–432.
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• Effect of Different Organic Matter Sources and Trichoderma viride Pers.: Fr. on Damping-Off of Tomato (Lycopercicum esculentum L.) var. Co-1 Seedlings Caused by Pythium indicum Bal.

Abstract Views :232  |  PDF Views:130

Authors

R. Neelamegam ¹

Affiliations
1 PG Department of Botany, S. T. Hindu College, Nagercoil-629 002, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 19, No 2 (2005), Pagination: 149-155

Abstract

Four different organic matter sources (dried leaf materials of Azadiracta indica, Madhuca indica, Morinda tinctoria, Peltophorum pterocarpum and Thespesia populnea), tested against Pythium indicum, either alone or in combination with Thchoderma viride. Application of T. viride and Thespesia leaf recorded maximum seed germination (100 %), low disease incidence (5,0 %), increased seedling growth (15.6 cm/pl), seedling vigour index (1560), and seedling biomass (23.8 mg/pl) in P. indicum inoculated unsteilized soil.

Keywords

Damping-Off, Integrated Control, Organic Matter Source, Pythium indicum, Trichoderma viride, Tomato.

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• Effect of Organic Matter Sources on In vitro Growth and Enzyme Production by Pythium indicum M. S. Balakr., a Damping-Off Pathogen and its Fungal Antagonist, Trichoderma viride Pers.: Fr.

Abstract Views :265  |  PDF Views:114

Authors

R. Neelamegam ¹

Affiliations
1 Department of Botany, S. T. Hindu College, Nagercoil 629002, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 18, No 2 (2004), Pagination: 161-166

Abstract

All organic matter sources showed inhibitory effect on the in vitro growth of Pythium indicum M.S. Balakr., while most of them support the growth of Trichoderma viride Pers.: Fr. Several organic matter sources increase the production of PTE-ase and Protease enzymes of fungal antagonist. However, the synthesis of Protease enzyme by pathogen was suppressed by all organic matter sources, while PTE·ase enzyme production was inhibited by few organic matter sources. Synthesis of cellulase by P. indicum was induced by many organic matter sources, but in case of T. viride. the same was inhibited except neem cake and wheat bran. Out of 12 organic matter sources tested, Neem cake and Wheat bran support the antagonist on its in vitro growth and synthesis of all the three enzymes as compared to control! pathogen.

Keywords

Cellulase, Organic Matter, Pectin Transeleminase, Protease, Pythium indicum, Trichoderma viride.

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• Evaluation of Fungal Antagonists to Control Damping-Off of Tomato (Lycopersicon esculentum Mill.) caused by Pythium indicum

Abstract Views :218  |  PDF Views:133

Authors

R. Neelamegam ¹

Affiliations
1 PG Department of Botany, S.T. Hindu College, Nagercoil 629 002, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 18, No 1 (2004), Pagination: 97-102

Abstract

Trichoderma viride, T. harzianum, Laetisaria arvalis and other eight isolates of Trichoderma viride, isolated locally. were tested in vitro for their antagonistic activity against Pythium indicum. the causal organism of danlping-off of tomato, by dual agar technique. Among the fungal antagonists tested, Trichoderma viride was found highly inhibitory to P. indicllm. Volatile and non-volatile antibiotics of T. viride inhibited the in vitro growth of P. indicum significantly.

Keywords

Damping-Off, Pythium indicum, Trichoderma viride, Volatile and Non-Volatile Antibiotics.

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• Integrated Application of Trichoderma Viride Pers.: Fr. and Farm Yard Manure to Control Damping-Off of Tomato [Lycopersicum esculentum Mill.]

Abstract Views :199  |  PDF Views:131

Authors

R. Neelamegam ¹, T. Govindarajalu ²

Affiliations
1 Department of Botany, S.T. Hindu College, Nagercoil 629 002, Tamil Nadu, IN
2 Department of Botany, Annamalai University, Annamalainagar 608 002, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 16, No 1 (2002), Pagination: 65-69

Abstract

In the present study, efforts were made to control the damping-off of tomato caused by Pythium indicum by using Trichoderma viride alone or in combination with farm yard manure (FYM). T. viride effectively controlled the disease in both sterilized and unsterilized soil than FYM when treated alone. But the combined treatment of T. viride and FYM showed better results in controlling the disease with concomineni increase In seedling length and biomass of tomato.

Keywords

Damping Off, Farm Yard Manure, Integrated Control, Pythium indicum, Tomato, Trichoderma viride.

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