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Borer damage and estimation of loss caused by sugar-cane stem-borers in southern Ghana

Published online by Cambridge University Press:  19 September 2011

M. A. Sampson  and
R. Kumar
M. A. Sampson
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya
R. Kumar
Affiliation:
Department of Biological Sciences, Rivers State, University of Science and Technology, P.M.B. 5080, Port Harcourt, Nigeria
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Abstract

Studies on damage by larvae of Eldana saccharina Walker, Chilo zacconius Bleszynski and Sesamia spp. to sugar-cane stands revealed a high degree of correlation between internode damage and stalk damage as well as between internode damage and sugar content of the canes. For every 1% increase in stalk damage there was a corresponding increase of 0.214% in the internode damage. The distribution of larvae inside the internodes was found to depend on the level of infestation. At low field infestation level (below 25 larvae per 100 canes) the distribution was random. As the level of infestation increases, the distribution becomes more aggregated. The distribution of damage in the sugar-cane field was found to depend on the overall stalk damage. The distribution tends to be more contagious when field level of stalk damage was less than 45%. The damage became evenly distributed when stalk damage rose above 60%. An estimation of average loss of sugar caused by stem-borers to the variety NCO 376 (at the field damage rate of 8.6, 10.6 and 3.1% damage for bottom, middle and top parts respectively of the cane) was U.S.S332.10 per ha of field.

Résumé

Une etude des extraits de travaux sur le dégât causé par des larves d’ Eldana saccharina Walker, Chilo zacconius Bleszynski et Sesamia spp. aux plantes de canne à sucre a révélé un degré élevé de corrélation entre d’ une part le dommage à l'entre-noeud et celui du trognon, et d'autre part le dommage à l'entre-noeud et le contenu sucrier des cannes. A chaque augementation d'un pourcent de dommage au trognon, correspondait une augmentation de 0,214% de dommage à l'entrenoeud. Il's est révélé que la répartition des larves au long des entre-noeuds dépendait du niveau d’ infestation de ceux-ci. Lorsque le nivesu d’ infestation du champ est bas (c'est-à-dire au-dessous de 25 larves sur 100 cannes) la répartition des larves n'est pas régulière. Par contre, lorsque le niveau d infestation s’ accroît, la répartition des larves devient plus agrégée. On constate que l'ampleur du dégât dans le champ de canne à sucre dépend de l ensemble des dommages causés aux trognons. La répartition se révèle plus contagieuse lorsque le taux du dégât est inférieur à 45%. Lorsque le dégât aux trognons atteignait plus de 60%, il s'est montre régulièrement réparti. Une estimation de la perte de sucre due aux fouisseurs à tige de la variété NCO 376 (â un taux de destruction du champ, équivalent à 8,6, 10,6 et 3, 1% du bas, du milieu et du haut de la canne respectivement) s'élevait à $312, 8 (dollars) par hectare de champ.

Keywords

Sugar-canepestborerlarvaedamageestimationsucrose contentGhanaCanne à sucrepestefouisseurlarvedégât (ou dommage)estimationcontenu sucrierle Ghana
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 6 , Issue 6 , December 1985 , pp. 705 - 710
Copyright
Copyright © ICIPE 1985

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