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Seasonal Patterns of Leafhopper, Amrasca biguttula biguttula on Okra in India

Published online by Cambridge University Press:  19 September 2011

K. Srinivasan ,
N. K. Krishnakumar ,
P. R. Ramachander  and
G. S. P. Rao
K. Srinivasan
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore-560 089, India
N. K. Krishnakumar
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore-560 089, India
P. R. Ramachander
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore-560 089, India
G. S. P. Rao
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore-560 089, India
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Abstract

Studies on seasonal patterns of okra leafhopper, Amrasca biguttula biguttula Ishida were conducted for two years. Time series analyses were adopted for working out weekly seasonal index of okra leafhopper. Low incidence of leafhopper was recorded from June to mid-January. Results further revealed that incidence of leafhopper was highly correlated with minimum temperature. There was no discernible time lag for population increase of leafhoppers. Prediction of leafhoppers at different crop growth stages for various months of sowing was done using dummy variable technique.

Résumé

Des études ont été faites pendant une période de 2 ans sur les évolutions saisonnières des cicadelles, Amrasca biguttula biguttula Ishida, qui affectent la plante okra. Les analyses de séries relatives au temps ont été adoptées pour calculer l'index saisonnier hebdomadaire de ces cicadelles. Une incidence basse des cicadelles a été relevée de juin au mi-janvier. Les résultats ont d'ailleurs montré que l'incidence des cicadelles était nettement correlée avec la température minimale. Il n'y avait pas de décalage perceptible de temps pour l'accroissement de population des cicadelles. Utilisant la technique de variables simulées, on pouvait prédire la population des cicadelles aux étapes différentes de la croissance des plantes, c'est à dire, on pouvait prédire la population relative aux mois différents après les semailles.

Keywords

OkraAmrasca biguttula biguttulaseasonal indextime lag associationpredictionOkraAmrasca biguttula biguttulal'index saisonnierdécalage de tempsprédiction
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 85 - 88
Copyright
Copyright © ICIPE 1988

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References

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