D. R. Mallikarjuna ¹, R. K. Patil ¹, Y. H. Sujay ¹, G. K. Ramegowda ¹

Affiliations
1 Department of Agricultural Entomology, College of Agriculture, University of Agricultural Sciences, Dharwad 580 005, Karnataka, IN

Abstract

Nomuraea rileyi (Farlow) Samson is a potential entomopathogenic fungus against lepidopteran pests. This was formulated as wettable powder and oil-based formulations to increase its efficiency in the field by using different carrier materials and oils and these were evaluated in the laboratory against two important noctuid pests, Helicoverpa armigera (Hubner) and Spodoptera litura (Fabricius). Among the wettable powder formulations of N. rileyi, viz., bentonite + glucose (7:1), talc + glucose (7:1), bentonite + sucrose (7:1) and talc + sucrose (7:1) recorded 87.0, 74.0, 72.0, 83.0 and 75.0 per cent mortality in S. litura and 79.0, 70.0, 66.0 and 88.0 per cent in H. armigera, respectively. The oil-based formulations (tank mix) with pongamia oil, sunflower oil, sesame oil and groundnut oil recorded 74.0, 90.0, 83.0 and 87.0 per cent mortality in S. litura and 73.0, 89.0, 87.0 and 87.0 per cent in H. armigera, respectively.

Keywords

Formulations, Helicoverpa armigera, Nomuraea rileyi, Oil-Based Formulations, Spodoptera litura.

Full Text

   

M. Vidya ¹, R. K. Patil ¹, G. K. Ramegowda ¹, S. Lingappa ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad- 580 005, Karnataka, IN

Abstract

Studies were made to explore the potentiality of Micromus igorotus for the management of aphids in cotton (Aphis gossypii G.), sorghum (Metanaphis sachari Zehntner) and safflower (Uroleucon carthami Theo.) ecosystems during November 2004-December 2005 at main Agricultural Research Station, University of Agricultural Sciences, Dharwad, Karnataka, India. Post-release observations revealed the presence of a mixture of brown lacewing larvae distinctly different from that of M. igorotus in cotton and sorghum ecosystems. These were identified as Micromus australis Hagen and Micromus timidus Hagen occurence of M. australis in cotton and sorghum ecosystems and on the prey aphids constitutes a new record.

Keywords

Cotton, Ecosystem, Micromus australis, Sorghum.

Full Text

   

M. Vidya ¹, S. Lingappa ¹, R. K. Patil ¹, G. K. Ramegowda ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad- 580 005, Karnataka., IN

Abstract

Biology and feeding potential of Micromus australis Hagen (Neuroptera: Hemerobiidae) was studied under laboratory conditions on Melanaphis sacchari (Zehntner), The predator was observed to pass through three larval instars. On an average first, second and third instars lasted for 2.00 ± 0.0, 1.35 ± 0.49 and 1.76 ± 0.44 days and consumed 58.82 ± 9.68, 67.47 ± 24.56 and 96.18 ± 20.15 aphids, respectively. The fecundity was 818.90 ± 331.81 eggs/female. The individual larvae consumed 213.18 ± 21.95 aphid nymphs to complete the larval duration (5.12 ± 0.49 days) and an adult consumed on an average 585,24 ± 120.49 aphid nymphs over a period of 41.75 ± 11.36 days. Per day consumption of the aphids was 41.82 ± 4.18 and 14,02 ± 9.41 by larva and adult, respectively.

Keywords

Hemerobiidae, Micromus igorotus, Biology, Feeding Potential, Micromus Sp.

Full Text

   

M. S. Puttannavar ¹, R. K. Patil ¹, M. Vidya ¹, G. K. Ramegowda ¹, S. Lingappa ¹, Shekarappa ¹, K. A. Kulkarni ¹

Affiliations
1 Department of Agricultural Entomology, College of Agriculture University of Agricultural Sciences Dharwad 580 005, Karnataka, IN

Abstract

A laboratory study was carried out on biology of sugarcane woolly aphid (SWA) predator, Dipha aphidivora Meyrick (Lepidoptera: Pyralidae). Dipha aphidivora occupied 5.6 ± 0.81, 24.61 ± 3.41, 7.80 ± 0.51, 1.65 ± 0.54 and 3.89 ± 0.74 days for incubation. total larval period, pupation, longevity of adult male and female, respectively. The total life cycle lasted for 43.27 ± 5.84 days. During its total larval period of 24.61 ± 3.41 days, a single D.aphidivora consumed on an average 6,074.84 ± 87.6 sugarcane woolly aphids.

Keywords

Biology, Dipha aphidivora, Sugarcane Woolly Aphid.

Full Text