Laboratory observations on the development of the rice moth Corcyra cephalonica (Stainton) (Lepidoptera: Galleriinae) on millet and sorghum at 28° and different relative humidities

Russell, V. M. and Schulten, G.G.M. and Roorda, F.A. (1980) Laboratory observations on the development of the rice moth Corcyra cephalonica (Stainton) (Lepidoptera: Galleriinae) on millet and sorghum at 28° and different relative humidities. Zeithschrift fur angewandte Entomologie, 89 (5). pp. 488-498.

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Abstract

A laboratory study was made on the development of two strains, T originating from Tchad and C from the Cameroon, of Corcyra cephalonica (Stainton) (Lep. Galleriinae) on millet and sorghum at 28 °C and different R.H.'s. The moisture contents of the grains in equilibrium with the R.H.'s tested were as follows: Millet 70% R.H. (12.98%), 30% R.H. (8.11%), 20% R.H. (6.62%) and 10% R.H. (5.53%); Sorghum 70% R.H. (12.17%), 30% R.H. (8.27%) and 20% R.H. (6.80%). The following mean developmental periods in days (egg-hatch-adult) were obtained: T-strain on millet, 70% R.H. (♀ 33.28, ♂ 33.64), 30% R.H. (♀ 55.71, ♂ 53.11), 20% R.H. (♀ 69.70, ♂ 57.68), 10% R.H. (♀ 100.77, ♂ 87.25); T-strain on sorghum, 70% R.H. (♀ 46.00, ♂ 46.88), 30% R.H. (♀ 70.00, ♂ 64.75), 20% R.H. (♀ 74.50, ♂ 65.93); C-strain on millet, 70% R.H. (♀ 41.00, ♂ 40.94), 30% R.H. (♀ 55.71, ♂ 53.11), 20% R.H. (♀ 79.00, ♂ 69.73), 10% R.H. (100% mortality); C-strain on sorghum, 70% R.H. (♀ 58.33, ♂ 51.50), 30% R.H. (♀ 68.25, ♂ 62.17), 20% R.H. (♀ 96.00, ♂ 141.00), 95.9% mortality. Adult weight and fore wing length decreased gradually at lower R.H., but the mean adult weight and fore wing length of the T-strain was greater than that of the C-strain under all conditions. The T-strain originating from the Sahel is considered better adapted for development under dry conditions than the C-strain which came from the humid african west coast. Females had in general one instar more than males bred at the same R.H. The number of instars increased at lower R.H. At 70% R.H. there were 7 instars in the female and 6 in the male, at 30% R.H. resp. 10 and 9, at 20% R.H. resp. 11 and 10 and at 10% R.H. resp. 12 and 11. In certain cultures exceptionally large numbers of instars were produced. The number of eggs laid by adult females ranged from 18 to 467 and was correlated with body weight, the heaviest adults laying the most eggs. Unfertilized females produced as many eggs at 70% R.H. as fertilized females but at 30% R.H. egg production of unfertilized females was considerably lower. No drinking of water was observed in females, even under dry conditions. The T-strain performed as well at 35 °C and 70% R.H. as at 28 °C. Fertility of males does not seem to become impaired by the high temperature. The results obtained in this study are discussed in relation to control of C. cephalonica.

Item Type: Article
Author Affiliation: Royal Tropical Institute, Department of Agricultural Research, Amsterdam, The Netherlands
Subjects: Atmosperic Science > Climatology
Statistics and Experimentation > Experimentation
Plant Physiology and Biochemistry > Plant Physiology
Social Sciences > Plant Physiology and Biochemistry > Plant Physiology
Divisions: General
Depositing User: Library ICRISAT-InfoSAT
Date Deposited: 20 Mar 2012 13:50
Last Modified: 20 Mar 2012 13:50
Official URL: http:/dx.doi.org/10.1111/j.1439-0418.1980.tb03490....
URI: http://eprints.icrisat.ac.in/id/eprint/4023

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