International Journal of Plant Protection

Mythri ¹, S. Pradeep ², S. V. Hugar ³

Affiliations
1 Raitha Samparka Kendra, Annigeri, Dharwad (karnataka), IN
2 University of Agricultural and Horticultural Sciences, Shimoga (karnataka), IN
3 Agri-business and Export Knowledge Centre, University of Agricultural Sciences, Dharwad (karnataka), IN

Abstract

Experiments were conducted on the biology, feeding potential and standardization of the mass production of Dipha aphidivora Meyrick predator on sugarcane woolly aphid, Ceratovacuna lanigera Zehntner during 2005-2007, at Agricultural Research Station (ARS), Honnavile, Shimoga (district), Karnataka, India. The duration of the first instar was 2.5 to 3.5 days (average 2.95+0.90 days). The average duration of second, third, fourth and fifth instar, pupal period, adult female and male moth lasted for 4.57+1.33, 8.30+1.11, 11.37+2.96 and 6.10+0.77 days, 8.50+2.15 days, 4.5+0.50 days, 1.5±0.30 days, respectively and the total larval period lasted for 24.5 to 39.5 days. The daily consumption rate by D. aphidivora was 30.8 aphids per day. D. aphidivora or aphid multiplied faster on 7-month-old crop than 5, 6 and 8 month old crop. At the rate of 50 number of D. aphidivora pupae release, highest populations of 4230 per shade net D. aphidivora were harvested. Highest populations of D. aphidivora were harvested when the shade nets were irrigated once in two days with the population of 4123 D. aphidivora per shade net than irrigated once in week with the population of 1490 D. aphidivora per shade net. During the experiment, average temperature was 280C and relative humidity was 78 per cent.

Keywords

Ceratovacuna Laniger, Dipha Aphidivora, Biology, Mass Production, Feeding Potential

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Mythri ¹, S. V. Hugar ², S. Pradeep ³

Affiliations
1 Raitha Samparka Kendra, Annigeri, Dharwad (Karnataka), IN
2 Agricultural Research Station, University of Agricultural Sciences, Dharwad (Karnataka), IN
3 University of Agricultural and Horticultural Sciences, Shimoga (Karnataka), IN

Abstract

Investigation on the seasonal incidences of Dipha aphidivora Meyrick (Pyralidae: Lepidoptera) and its natural enemies from June 2005 to May 2006 undertaken at Agricultural Research Station, Honnavile, Bhadravathi and Shimoga district revealed an incidence ranging from 1.6 to 7.2 larvae per plant recorded at Shimoga district (Location I, Shettihalli), 1.1 to 7.9 larvae per plant at Shimoga district (Location II, Honnavile), 0.7 to 6.9 larvae per plant at Bhadravathi taluk (Location III, Barandur) and 1.2 to 6.5 larvae per plant at Bhadravathi taluk (Location IV, Tadsa). The highest incidence of 7.2, 7.9, 6.5 larvae per plant was observed during October month at Shimoga district, (Location I, Shettihalli), (location II, Honnavile) and Bhadravathi taluka (Location IV, Tadsa) and 6.5 larvae per plant was observed during September month at Bhadravathi taluk (Location III, Barandur). The lowest population of 1.6 and 1.1 larvae per plant was recorded during July month at location I, II, 0.7, and 1.2 larvae per plant was recorded at location III and location IV. The D. aphidivora population had two peaks in a year one at October and another at January. The correlation between the D. aphidivora population and weather parameters revealed that the incidence of D. aphidivora was negatively correlated with minimum temperature, maximum temperature and rainfall and positively correlated with relative humidity in all the four locations. The correlation between D. aphidivora population and SWA population showed significant positive correlation at location I, location III and location IV and non-significant negative correlation at location II. The natural enemies recorded on D. aphidivora were the field lizards and an unidentified bird, which devoured D. aphidivora. No parasites were recorded on D. aphidivora.

Keywords

Seasonal Incidences, Dipha aphidivora, SWA, Sugarcane, Weather.

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