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Economic Injury Levels and Economics of Control of the Mustard Aphid, Lipaphis erysimi (Kalt.) on Mustard 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 Govind Ballabh Pant University of Agriculture and Technology, Pantnagar-263 145, Nainital (UP), India
G. C. Sachan
Affiliation:
Department of Entomology, College of Agriculture Govind Ballabh Pant University of Agriculture and Technology, Pantnagar-263 145, Nainital (UP), India
*
Corresponding author: CPS.
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Abstract

The economic injury levels (EIL) of the mustard aphid, Lipaphis erysimi on mustard, Brassica juncea were evaluated in field trials in Tarai, India, during the winters of 1986/87 and 1987/88. The EIL values ranged between 37 and 4, and 48 and 6 aphids per 10 cm terminal shoot per plant during the 1986/87 and 1987/88 trials respectively. A one-day increase in crop exposure to the aphids led to a significant reduction in seed yield per plant, 1000-seed weight, number of siliquae per plant and number of seeds per siliqua. The highest benefit-to-cost ratio was obtained at 3 weeks of exposure, when initiation of insecticide application was most economical.

Résumé

L'évaluation des niveaux économiques des dégâts (NED) infligés par le puceron de la moutarde, Lipaphis erysimi, a été faite sur la moutarde, Brassica juncea, dans les essais en champs à Tarai en inde, pour les périodes d'automne 1986/87 et 1987/88. Cette évaluation a montré que le nombre de pucerons par section de 10 cm du bourgeon terminal se situait respectivement entre 37 et 4; et entre 46 et 6 pucerons au cours des périodes de 1986/87 et 1987/88. Un jour en plus d'exposition des plantes au puceron réduisait significativement le rendement en graines, le poids des 1.000 graines, le nombre de siliques par plante ainsi que le nombre de graines par silique. La relation du bénéfice-coût la plus élevée a été obtenue à la troisième semaine d'exposition des plantes au puceron. C'est à cette période que l'application d'insecticide était la plus économique.

Keywords

Brassica junceaeconomic injury levelLipaphis erysimimustard aphidmustardBrassica junceaniveau économique des dégâtsLipaphis erysimipuceron de la moutardela moutarde
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 17 , Issue 3-4 , December 1997 , pp. 293 - 296
Copyright
Copyright © ICIPE 1997

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