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Biology ofTrichogrammatoidea simmondsi (Hym.: Trichogrammatidae) on sorghum shoot fly,Atherigona soccata (Dipt.: Muscidae) eggs

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Abstract

Experiments were conducted in a rearing room to study the biology ofTrichogrammatoidea simmondsi Nagaraja (Hym.: Trichogrammatidae) on sorghum shoot fly,Atherigona soccata Rondani (Dipt.: Muscidae) eggs. Shoot fly eggs were divided in two groups: 1) eggs < 24 h old and, 2) > 24 h old eggs. Thirty eggs of each group were used in a randomized complete block design with four replicates. Shoot fly eggs less than 24 h old were preferred (73% of parasitism) over 24 h old eggs (7.25%). Three larval instars ofT. simmondsi were observed. Few eggs with twoT. simmondsi exit holes (1.87%) were recorded in > 24 h old eggs compared with < 24 h ones (3.74%). The sex ratio male: female was 1 ∶ 1.47. The development from oviposition to adult emergence ranged from 7 to 12 days (average=9.8±1.31, n=40), and the average life span of male and femaleT. simmondsi was 25±1.46 h (range 22–26 h, n=12) and 35.17±10.9 (range 25–50 h, n=28) respectively at 26° C, 60–65% R.H. and 12 ∶ 12 (L/D) photoperiod. This paper constitutes the first published information on the biology ofT. simmondsi on the sorghum shoot fly eggs.

Résumé

Des essais ont été conduits en salle d'élevage en vue d'étudier la biologie deTrichogrammatoidea simmondsi Nagaraja (Hym.: Trichogrammatidae) sur les œufs de la mouche des pousses du sorgho,Atherigoa soccata Rondani (Dipt.: Muscidae). Les œufs de la mouche ont été divisés en deux groupes: 1) ℧ufs âgés de < 24 h, 2) > 24 h. Trente œufs de chaque groupe ont été utilisés dans un dispositif en blocs complets randomisés à quatre répétitions. Les œufs de moins de 24 h d'âge ont été plus parasités (73% de parasitisme) que ceux de plus de 24 h d'âge (7,25% de parasitisme). Trois stades larvaires deT. simmondsi ont été observés. La présence de deux trous d'émergence deT. simmondsi était moins élevée (1,87%) dans les œufs de > 24 h que dans ceux de < 24 h (3,74%). Le sex ratio mâle: femelle était de 1 ∶ 1,47 Le cycle de développement de l'œuf à l'émergence de l'adulte variait de 7 à 12 jours avec une moyenne de 9,8±1,31 (n=40). La durée moyenne de vie du mâle et de la femelle deT. simmondsi était respectivement de 25±1,46 h (variation 22–26 h, n=12) et 35,17±10,9 (variation 25–50 h, n=28) à 26°C, 60–65% H.R. et une photopériode de 12 ∶ 12. Cet article constitue la première information publiée sur la biologie deT. simmondsi sur les œufs de la mouche des pousses du sorgho.

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Zongo, J.O., Vincent, C. & Stewart, R.K. Biology ofTrichogrammatoidea simmondsi (Hym.: Trichogrammatidae) on sorghum shoot fly,Atherigona soccata (Dipt.: Muscidae) eggs. Entomophaga 38, 267–272 (1993). https://doi.org/10.1007/BF02372562

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