Journal ID : AMA-21-12-2022-11906
[This article belongs to Volume - 53, Issue - 12]
Total View : 432

Title : Molecular identity and clue regarding age of adult for field release of a native larval parasitoid of fall armyworm, Spodoptera frugiperda (Smith)

Abstract :

From Sabour location of Bhalpur, Bihar, India, more than 100 fall armyworm (FAW) caterpillars were collected from the maize field for the emergence of larval parasitoid/s at insect raring facility of Department of Entomology, BAU, Sabour during 2021 but no emerged out parasitoids were found from those. Consequent upon that, few FAW caterpillars were exposed to a pair of braconid wasps which were available with the Corcyra culture in the laboratory it was noticed that the exposed caterpillars were paralyzed and parasitized by the female of that braconid. The identity of the used pair at that time was not known. After observing the acceptance of FAW by those, the emerged out adults of the braconids were further used for its molecular characterization to know its identity which revealed that braconid wasp was actually Habrobracon hebetor Say. From the state of Bihar, this is the first report regarding native larval parasitoid associated with FAW. This larval parasitoid preferred mainly the thoracic sternum of FAW for deposition of eggs. Freshly emerged adults of H. hebetor were sexed and kept separately inside glass vials and were released inside a vial having full grown FAW caterpillars as per their age of 24 hous, 48 hours, 72 hours, 96 hours, 120 hours and 144 hours. Considering the parameters like number of eggs, larvae, cocoons and number of adult wasps as well as sex ratio, it is inferred that as the adults of H. hebetor at 96 hours after emergence produced maximum number of eggs, cocoons and total number of adults (that too having desirable sex ratio) in the laboratory condition, the release of H. hebetor adults in the field should be after 3 days of emergence for maximum suppression of FAW and ‘on filed multiplication’. However, this finding requires further validation by conducting such field experiments.

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