Studies on Reproductive Biology of Yellow Stem Borer, Scirpophaga incertulas Walker (Lepidoptera: Pyralidae) in the Changing Climate Scenario
Gangappa Nayak *
College of Agriculture, UAS, Raichur, India.
Prabhuraj A.
PRFQAL, University of Agricultural Sciences, Raichur, India.
Sujay Hurali
AICRP on Rice, Agriculture Research Station, Gangavathi, India.
S. G. Hanchinal
AICRP on Cotton, MARS, UAS, Raichu, India.
M. Bheemanna
University of Agricultural Sciences, Raichur, India.
B. G. Koppalkar
Department of Agronomy, UAS, Raichur, India.
J. M. Nidagundi
AICRP on Cotton, MARS, UAS, Raichu, India.
*Author to whom correspondence should be addressed.
Abstract
Studies on reproductive biology of yellow stem borer, Scirpophaga incertulas walker in the changing climate scenario conducted at Agriculture Research Station, Gangavathi during 2020-22.Results on post eclosion behavior of yellow stem borer revealed that the maximum female moths emerged between 18:00 and 21:00 hrs from among the emerged moth the female calling was observed between 23:00 and 02:00 hrs. The time of mating commenced after the calling period and was observed between 23:00 and 03:00 hrs. The average pre-oviposition period, oviposition period and post-oviposition period were completed in 1.09 ± 0.09, 1.28 ± 0.17 and 0.85 ± 0.25 days, respectively. The longevity of adult females and males was about 3.23 ± 0.29 and 2.66 ± 0.33 days, respectively. The total number of eggs laid varied from 68 to 221 in number with an average of 146.95 ± 43.98 per female. The Operational and intrinsic sex ratio of YSB were observed to be female-biased with 1:1.35 and 1:1.44 of male to female moths, respectively.
Keywords: Biology, climate, female calling, operational sex ratio, yellow stem borer