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Estimation of losses in yield of rapeseed, Brassica campestris, by the mustard aphid, Lipaphis erysimi (Kalt.) in Tarai, India

Published online by Cambridge University Press:  19 September 2011

C. P. Singh  and
G. C. Sachan
C. P. Singh
Affiliation:
Department of Entomology, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar-263145, Nainital (UP), India
G. C. Sachan
Affiliation:
Department of Entomology, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar-263145, Nainital (UP), India
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Abstract

Studies on losses in yield of rapeseed, Brassica campestris cv. Brown Sarson, caused by the mustard aphid, Lipaphis erysimi (Kalt.) were conducted under natural and artificial conditions. Based on the experiments on the influence of aphid exposure to the crop on aphid number and seed yield and the effect of varied aphid population at flowering/pod initiation stage and artificial release of aphids at 10-day intervals starting from 40 days of sowing on the plant height, number of siliquae per plant, number of primary branches, seed yield per plant and 1000-grain weight, a positive correlation between length of aphid exposure to the crop and aphid population was found. A negative relationship between aphid population, length of aphid exposure and seed yield was observed. An inverse and significant relationship existed between parameters contributing to yield loss and losses in seed yield. However, this relationship was not significant in siliquae per plant and 1000-grain weight. A similar relationship was observed in artificial infestation.

Résumé

Des études portant sur des pertes de rendement dues à Lipaphis erysimi (Kalt.) sur Brassica campestris cv. sarson brun, ont été conduites dans des conditions tant naturelles qu'artificielles. Les experiences ont porté sur l'influence de l'exposition de la culture aux pucerons, sur le nombre de pucerons et rendement en grain et l'effet de différentes populations de pucerons au stade d'émergence de fleur/gousse et lâcher de pucerons à intervalle de 10 jours 40 jours après semis, la hauteur de la plante, le nombre de siliquae par plante, le nombre de branches primaires, le rendement en grain par plant et le poids de 1000 grains. Une correlation positive a été trouvée entre durée d'exposition de la culture aux pucerons et population de pucerons. Une correlation négative a été observée entre population de pucerons, durée d'exposition aux pucerons et rendement en grains. Il y a eu une relation inverse significative entre pertes de rendements et pertes de rendement en grains. Cependant, cette relation n'était pas significative pour les siliquae par plante et le poids de 1000 grains. Une semblable relation a été observée lors de l'infestation artificielle.

Keywords

Brassica campestrisBrown SarsonLipaphis erysimimustard aphidyield lossesBrassica campestrissarson brunLipaphis erysimipuceron du moutardierpertes de rendement
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 16 , Issue 3-4 , December 1995 , pp. 283 - 286
Copyright
Copyright © ICIPE 1995

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References

REFERENCES

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