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The development of quantitative occurrence prediction of infestation by the rice stem-borer,Chilo suppressalis Walker, in Japan

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Abstract

The new method was developed with the objective to meet the universal demand for the prediction of the abundance of the rice stem-borer,Chilo suppressalis Walker, after 30 years’ pending state. The degrees of infestation were assessed by the sequential sampling test under the prevailing three categories, low, moderate and high in terms of percentage infested rice hills. The numerical table (Col. 1st in table I) available for this purpose in the case with the first generation of the borer has been constructed newly according to the formulae, P=1−e−m, and m=aμb, which were derived originally byKono & Sugino (1958) from the data concerning the second generation of the borer (Col. 2nd in table I). Through this table, the difference has been clarified between the case with these two generations, and the quantitative relation between P and μ has been generalized greatly. Thus, by connecting ecologically the rice plant damage caused by this rice stemborer with the population density of the borer, the way has been opened to forecast practically the abundance of the rice stem-borer at each generation.

Résumé

Une méthode a été mise au point pour prédire le développement des infestations par le foreur,C. suppressalis et répondre ainsi à une question posée depuis 30 ans.

Elle consiste en l’estimation de 3 degrés d’infestation: basse (<5 %) moyenne (10–20 %) et élevée (>40 %) selon le pourcentage de pieds attaqués, en procédant à des échantillonnages successifs, en vue de déterminer la nécessité ou non d’un traitement au point de vue économique.

Une table numérique valable pour la première génération (1re colonne du tableau) a été établie d’après le pourcentage de pieds infestés, et d’après le nombre moyen, μ, de tiges attaquées par pied, en fonction de la relation P=1−e−m (avec m = a μb). Cette table a permis de mettre en évidence les différences entre la première et la deuxième génération (colonne 2 du tableau) et de généraliser la relation quantitative entre P et μ.

Cette table est nécessaire pour définir la corrélation entre les dégâts et les niveaux de population des foreurs du riz à chaque génération.

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Authors and Affiliations

  1. Institute of Biological Control, Faculty of Agriculture, Kyushu University, Kyushu, Japan

    T. Torii

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  1. T. Torii
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Torii, T. The development of quantitative occurrence prediction of infestation by the rice stem-borer,Chilo suppressalis Walker, in Japan. Entomophaga 16, 193–207 (1971). https://doi.org/10.1007/BF02371170

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