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Effects of Temperature on Longevity, Fecundity and Fertility of the Sorghum Shootfly, Atherigona Soccata Rondani

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Abstract

Effects of temperature on female longevity, fecundity and fertility of the sorghum shootfly, Atherigona soccata Rondani, were investigated. The longevity, preoviposition and oviposition periods, eggs per female per day, mean eggs per female and fertility (per cent eggs hatched), for the shootflies maintained at constant temperatures of 20, 25 and 30°C and alternating temperatures of 30°C (photophase) and 20°C (scotophase) referred to as 20–30°C were determined. At lower temperature (20°C), the longevity, preoviposition and oviposition periods were prolonged considerably, while daily egg production, mean fecundity and fertility were decreased. Higher temperature (30°C) had the reverse effect on preoviposition and oviposition periods as well as daily egg production. There was a significant positive correlation between the pupal weight and the number of eggs laid by the fly at 20°C. Egg mortality increased with advance in maternal age. The rate of increase in egg mortality was faster at 30°C than at lower temperatures.

Résumé

Des recherches ont été menées sur les effets de la température sur la longévité, la fécondité et la fertilité des femelles de la mouche du sorgho, Atherigona soccata Rondani. Les paramètres suivants ont été évalués chez des femelles élevées sous trois régimes de températures constantes: 20, 25 et 30°C, ainsi qu’en températures alternées de 20°C pendant la scotophase et 30°C pendant la photophase; longévité, durée de la période préreproductrice et de la période reproductrice, nombre d’oeufs par femelle et par jour, nombre moyen d’oeufs par femelle, fertilité (pourcentage d’éclosion). A la température la plus basse (20°C), la longévité ainsi que les périodes préreproductrice et reproductrice sont considérablement allongées, cependant que la production quotidienne d’oeufs, la fécondité et la fertilité moyennes sont réduites. La température la plus élevée (30°C) a l’effet inverse sur les périodes préreproductrice et reproductrice, ainsi que sur la production quotidienne d’oeufs. Il existe une corrélation positive entre le poids nymphal et la pombre d’oeufs pondus par la femelle à 20°C; la mortalité embryonnaire s’accroît avec l’âge de la mère. Le taux d’accroissement de la mortalité embryonnaire est plus élevé à 30°C qu’aux autres températures.

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Unnithan, G.C., Delobel, A.G.L. Effects of Temperature on Longevity, Fecundity and Fertility of the Sorghum Shootfly, Atherigona Soccata Rondani. Int J Trop Insect Sci 6, 513–516 (1985). https://doi.org/10.1017/S1742758400004331

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  • DOI: https://doi.org/10.1017/S1742758400004331

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