Natural Enemies of Rice White Stem Borer Scirpophaga fusciflua (Hampson) in Himachal Pradesh
DOI:
https://doi.org/10.55446/IJE.2021.27Keywords:
Scirpophaga fusciflua, rice, predators, parasitoids, Himachal Pradesh, Khangra valley, parasitisation, egg, larval, pupal parasitoids, predators, spiders, odonatesAbstract
Fortnightly surveys were made to study natural enemies of white stem borer (WSB) Scirpophaga fusciflua (Hampson) in rice. The surveys revealed that the predators of S. fusciflua first appeared in the second fortnight of July, with the peak during second fortnight of September during 2016 and 2017; and their relative proportion was- spiders (49.4% and 51.2%), dragonflies (22.2% and 22.6%) and damselflies (28.4% and 26.2%). Four species of parasitoids viz., egg- Telenomus sp. and Tetrastichus sp., larval- Stenobracon sp. and pupal parasitoids- Xanthopimpla punctata were observed from egg mass, larvae and pupae collected from Kangra valley of Himachal Pradesh. During 2016 and 2017, the % parasitization was observed to be maximum in the first fortnight of October (53.5 and 62.0%) followed by second fortnight of September (36.4 and 49.1%), respectively.
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