Nikita S. Awasthi ¹, S. Sridharan ¹, S. Mohan Kumar ²

Affiliations
1 Department of Agricultural Entomology, Centre for Plant protection Studies, TNAU, Coimbatore – 641003, Tamil Nadu, IN
2 Department of Plant Biotechnology, Centre for Plant Molecular Biology and Biotechnology, TNAU, Coimbatore – 641003, Tamil Nadu, IN

Abstract

Banana pseudostem borer Odoiporus longicollis Olivier is one of the serious monophagous pest threatening the production and productivity of banana in south India. The native isolate of entomopathogenic fungi Metarhizium anisopliae (Metchinkoff) Sorokin was identified and evaluated for its virulence to O. longicollis compared with other entomopathogenic fungal isolates. The native isolate M. anisopliae (Ma-BW) showed higher virulence to adults with the minimum LC₅₀ value ∼1.0 × 10⁷ spores ml^-1 and faster lethal effect on adult O. longicollis with the shortest LT₅₀ value of 62.54 hours. Among different oil in water formulations of Ma-BW evaluated against adult O. longicollis in laboratory at 2% showed that the formulation of Ma-BW in ground nut oil performed superior with adult mortality of 83.33 per cent at 120 HAT followed by oil formulations of Ma-BW in sunflower oil, gingelly oil and neem oil with76.67 per cent adult mortality at the same concentration and time period.

Keywords

Attract-And-Kill, Native Isolate, Oil-In-Water Formulation, LC50, LT₅₀.

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J. Alfred Daniel ¹, K. Ramaraju ², S. Mohan Kumar ³, P. Jeyaprakash ⁴, N. Chitra ⁵

Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
2 Director of Research, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
3 Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
4 Department of Rice, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
5 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore -641003, Tamil Nadu, IN

Abstract

For insect diversity studies to be of value, the sampling methods employed must produce samples representative of the community or taxon selected for the investigation. However, as yet, few evaluations on the variability and effectiveness of sampling methods have been undertaken. The survey was carried out in the rice fields during 2015-16 in Paddy Breeding Station, Tamil Nadu Agricultural University, Coimbatore. From this study a total of 1,019 parasitoid individuals were collected. Among six different collection methods employed for sampling hymenopteran parasitoids in rice ecosystem, the yellow pan trap at ground level was found to be the most effective method in trapping the parasitoids (27.2 ± 2.56 parasitoids per day) followed by sweep net method (12.1 ± 1.03 parasitoids per day). The next best sampling method is yellow pan trap erected at canopy level which recorded a mean of 9.2 ± 2.26 parasitoids per day. The other three traps viz., malaise trap, suction trap and light trap were found to collect less number (<1.5) of parasitoids per day.

Keywords

Efficiency, Parasitoids, Rice, Sampling, Traps.

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