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Amutha, M.
- Evaluation of Fungal Pathogens for the Management of Mealybugs in Bt Cotton
Abstract Views :253 |
PDF Views:133
Authors
Affiliations
1 Central Institute for Cotton Research, Regional Station, Coimbatore – 641 003, Tamil Nadu, IN
1 Central Institute for Cotton Research, Regional Station, Coimbatore – 641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 26, No 1 (2012), Pagination: 92-96Abstract
Three entomopathogenic fungi (Verticillium lecanii, Beauveria bassiana and Metarhizium anisopliae) along with two standard insecticides (acephate and chlorpyriphos) were evaluated for their effectiveness in the field of Bunny Bt (Cry IAC) cotton neem oil + detergent (Nirma) powder and detergent powder alone during 2007-08&2008-09 against two mealybugs viz., Phenococcus solenopsis and Paracoccus marginatus. The results revealed that B. bassiana, V. lecanii and M. anisopliae brought out a reduction of 39.1, 30.9 and 28.2 per cent incidence and 69.0, 59.0 and 23.1 per cent population of mealybugs respectively, while, the insecticides acephate and chlorpyriphos brought out a reduction of 93.8 and 87.1 per cent incidence and 97.8 and 95.3 per cent population, respectively. Detergent powder brought out a reduction of 51.7 per cent incidence and 82.4 per cent population, while detergent powder + neem oil brought out a reduction of 20.9 and 36.1 per cent, respectively. Observation on the activity of predators revealed that B. bassiana, V. lecanii and M. anisopliae brought out a reduction of 61.3, 51.6, and 6.5 % coccinellids and 33.7, 15.2&22.8 % spiders as against 54.8 and 42.4 % respectively in the standard insecticide acephate. Treatments with neem oil+ detergent powder and detergent powder alone did not reduce coccinellid population, however, reduced spider population by 22.6&13.0 percent respectively. All the treatments recorded significantly higher yield over control during 2008 - 09 and the increase in yield over control ranged from 18.0 to 43.0 %.Keywords
Mealybug, Phenococcus solenopsis, Paracoccus marginatus, Pathogenicity, Beauveria bassiana, Verticillium lecanii and Metarhizium anisopliae.References
- Banu JG, Surulivelu T, Amutha M, Gopalakrishnan N. 2010. Laboratory evaluation of insecticides and pesticides against Phenococcus solenopsis and Paracoccus marginatus infesting cotton. J Biopesticide. 3: 343 – 346.
- Curkovic T, Gary Burett, Araya E. 2007. Evaluation of insecticide activity of two agricultural detergents against the long–tailed mealybug, Pseudococcus longispinus (Hemiptera: Pseudococcidae) in laboratory. Agri Tech (Chile). 67: 422 – 430.
- Lacey LA, Frutos R, Kaya HK, Vail P. 2001. Insect pathogens as biological control agents: Do they have a future? Biol control 21: 230 – 248.
- Lemawork S. 2008. Evaluation of entomopathogenic fungi and hot water treatment against enset ischolar_main mealybug, Cataenococcus ensete, Williams and Matile-Ferrero (Homoptera: Pseudococcidae) on enset. M.Sc., thesis, Department of plant sciences, Awassa college of agriculture, School of Graduate Studies Hawassa University, Awassa, Ethiopia. 87 p.
- Monga D, Kumar R, Vijander Pal, Jat MC. 2009. Mealybug, new pest of cotton crop in Haryana: A survey. J Insect Sci. 22: 101-103.
- Suresh S, Jothimani R, Sivasubramanian P, Karuppuchamy P, Samiyappan R, Jonathan EI. 2010. Invasive mealybug of Tamil Nadu and their management. Karnataka J Agric Sci. 23: 6 –9.
- Tanwar RK, Jeyakumar P, Monga D. 2007. Mealybugs and their management. Technical Bulletin 19, National Centre for Integrated pest Management, New Delhi. 12 p.
- Tanwar RK, Jeyakumar P, Vennila S. 2010. Papaya mealybug and its management strategies, Technical Bulletin 22, National Centre for Integrated Pest Management, New Delhi, 22 p.
- Pathogenesis of Entomopathogenic Fungus, Metarhizium anisopliae (Metsch.) Sorokin., on Mealybug, Paracoccus marginatus (Williams and Granara De Willink) (Homoptera:Pseudococcidae)
Abstract Views :282 |
PDF Views:148
Authors
M. Amutha
1,
J. Gulsar Banu
1
Affiliations
1 ICAR-Central Institute for Cotton Research (CICR), Regional Station,Coimbatore–641 003, Tamil Nadu, IN
1 ICAR-Central Institute for Cotton Research (CICR), Regional Station,Coimbatore–641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 29, No 3 (2015), Pagination: 134-138Abstract
A study was conducted to investigate the basis and mode of infection of the entomopathogenic green muscardine fungus, Metarhizium anisopliae on the mealybug, Paracoccus marginatus. The pathogenesis of M. anisopliae on P. marginatus was studied at 24, 48, 72, 96, 120, 144 and 168 hours after inoculation. The conidial adhesion and germination process of M. anisopliae occurred within 24 hours after inoculation. The hyphae penetrated the epicuticle and reached the endocuticle within 48 to 72 hours after inoculation. Lysis of the endocuticle occurred while the penetrant hyphae invaded into the epidermis. Invasion and colonization of hyphal bodies into the haemocoel of P. marginatus was observed at 72 to 120 hours after inoculation. By 120 to 144 hours after inoculation, there was considerable abundance of hyphae that extensively colonized on the host and complete invasion occurred at 168 hours after inoculation. At this stage, the larvae became moribund and died. Hyphae re-emerged out of the cuticle after 168 hours after inoculation, and grew all over the surface forming a green mycelial mat. The developmental cycle of M. anisopliae on P. marginatus took 172 to 196 hours to disintegrate and kill the insect from the day of inoculation.Keywords
Histopathology, Metarhizium anisopliae, Mealybug, Paracoccus marginatus, Pathogenicity.- In planta colonisation of Beauveria bassiana in cotton plant and its effect against insect pests
Abstract Views :239 |
PDF Views:112
Authors
Affiliations
1 Crop Protection Division, ICAR-Central Institute for Cotton Research (CICR), Coimbatore - 641003, Tamil Nadu, IN
1 Crop Protection Division, ICAR-Central Institute for Cotton Research (CICR), Coimbatore - 641003, Tamil Nadu, IN