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Biometrical, Observations on Sorghum Stem Borer, Chilo Partellus (Swinhoe) Under Fluctuating And Constant Temperature Conditions

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Abstract

Effect of fluctuating and constant temperatures on different population growth parameters of Chilo partellus (Swinhoe) infesting sorghum was studied in the laboratory. On the basis of intrinsic rate of natural increase (m) values, the optimum constant and fluctuating temperatures for the multiplication of this pest was 30 ± 1°C and 31.0 to 35.8°C, respectively. But the favourable range of temperature varied from 27.5 to 30.0°C under both constant and fluctuating temperature conditions. Mean length of generation (T) at this range of temperature varied from 38 to 41 days. It seems that Chilo partellus may not persist at or above 40°C and below 20°C, as the rm values at these temperatures were negligible or zero. This information can be used in working out the strategy for controlling Chilo partellus.

Résumé

L’effet des températures fluctuantes et constantes sur les différents paramètres de la croissance de la population du Chilo partellus infestant le sorgho. Sur base du taux intrinsèque de croissance naturelle, on a constaté que les températures optima constantes et fluctuantes pour la multiplication de cette bête sont 30 ± 1°Cet 31,0 à 35,8°C, respectivement. Mais les variations de la température allaient de 27,5 to 30,0°C sur les conditions de température constantes ou fluctuantes. La durée moyenne de la génération (T) dans ce milieu varie de 38 à 41 jours. Il semble que le Chilo partellus ne peut pas survivre dans le milieu où la température est égale où supérieure 40°C et inférieure à 20°C, donc le taux de croissance dans de tels milieux est négligeable voire zéro. Cette information peut-être utilisée au cours de l’élaboration la stratégie pour le contrôle du Chilo partellus.

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Singh, S.P. Biometrical, Observations on Sorghum Stem Borer, Chilo Partellus (Swinhoe) Under Fluctuating And Constant Temperature Conditions. Int J Trop Insect Sci 12, 419–422 (1991). https://doi.org/10.1017/S1742758400011309

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