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Determination of Economic Injury Level of the Stem Borer, Chilo Partellus (Swinhoe) in Maize, Zea Mays L.

Published online by Cambridge University Press:  19 September 2011

K. V. Seshu Reddy  and
K. O. S. Sum
K. V. Seshu Reddy
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
K. O. S. Sum
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
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Abstract

The economic injury level (EIL) of the maize stem borer, Chilo partellus (Swinhoe) was determined by artificially infesting maize (cv. Katumani) plants at three different growth stages; viz, 20, 40 and 60 days old plants with varying densities of newly hatched larvae; viz, 2, 4, 6, 8, 10 and 12 per plant constituting the borer population. The grain yield data obtained from the infested and the protected plants showed that maximum yield reduction and stalk damage occurred to the 20-day old crop, while there was insignificant larval effect on yields for the 60-day old crop. Regression analyses gave a significant linear equation (y = a + bx) which estimated the yields per plant at different infestation levels and these were used to calculate the economic injury level at each stage. The resultant EIL was 3.2 and 3.9 larvae/plant for 20- and 40-day old plants, respectively.

Résumé

Le niveau de dégâts economiques par le boreur du maïs, Chilo partellus (Swinhoe) a été déterminé, après infestation artificielle des plantes de maïs (cv. Katumani) agées de 20, 40, et 60 jours, et en faisant varie la densité de larves nouvelles-nées de 2, 4, 6, 8, 10 et 12 chenilles par plante. Le maximum de réduction de rendement et de dégâts de tiges est apparu sur les plantes agées de 20 jours. Par contre, il n'y a pas eu d'effet significatif des larves sur le rendement des plantes de 60 jours. L'analyse de regression a donné une equation lineaire (y = a + bx), laquelle a permis d'estimer le rendement par plante différents niveaux d'infestation, et de calculer le niveau de dégâts economiques de chaque stade. Le niveau de dégâts economiques a été de 3, 2 et de 3, 9 larves/plante pour les plantes agées de 20 et 40 jours, respectivement.

Keywords

Economic injury level (EIL)stem borerChilo partellusmaizeyield lossesNiveau de dégâts economiquesboreur de tigeChilo partellusmaïsperte de rendement
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 12 , Issue 1-2-3: Current Topics in Tropical Entomology , June 1991 , pp. 269 - 274
Copyright
Copyright © ICIPE 1991

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