Journal
BIOLOGICAL CONTROL
Volume 183, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.biocontrol.2023.105242
Keywords
Spodoptera frugiperda; Spodoptera littoralis; Telenomus remus; Biological control
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Although there are limitations in the number and preference of parasitization of T. remus, it can be used as a substitute host for the mass multiplication of T. remus in a biological control program.
The egg parasitoid Telenomus remus has emerged as one of the potential candidates for use in biological control of the of the fall armyworm, Spodoptera frugiperda in Africa. However, its uses in biological control require a better understanding of its biology and the development of a cost-effective mass production. We firstly determined how T. remus reacts to an increasing S. frugiperda egg density. Subsequently we identified its preference for parasitism as a function of S. frugiperda egg age. Finally, we assessed the acceptability of Spodoptera littoralis as a factitious host for T. remus rearing. The number of eggs parasitized by T. remus increased as the egg density increased. Competition between T. remus females resulted in a male-biased sex ratio. Regarding host-eggs age, T. remus females prefer 1-day-old eggs over 2-or 3-day-old eggs. With respect to host acceptability, T. remus was shown to parasitize S. littoralis eggs and produce viable offspring. Although, T. remus tended to parasitize fewer S. littoralis than S. frugiperda eggs it can be used as a factitious host for the mass multiplication of T. remus in a biological control program.
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