Studies on Population Dynamics of Yellow Stem Borer, Scirpophaga incertulas walker (Lepidoptera: Pyralidae)

Author: Gangappa Nayak, Prabhuraj A., Sujay Hurali, S.G. Hanchinal, M. Bheemanna, B.G. Koppalkar and J. M. Nidagundi

Download PDF

Abstract

The yellow stem borer (YSB) is monophagous and closely associated with the crop throughout the cropping period, better understanding of its adult activity pattern studies is considerable. This study was conducted on paddy crop at Agriculture Research Station, Gangavathi during 2021-22. Ten locations monitored using pheromone traps revealed clear patterns in the flight period. Moths burst on scene only during the expected times, with a clear rise, fall and an in-between peak. Each flight period occurred at exactly the time of transition between two generations and there was a distinct definiteness with the higher period. Each flight period preceded and followed by zero moth activity. Further there was a distinct occurrence of definite life stages for the period of observations. The first peak trap catches ranged from 11.33 to 121.67 moths/trap/week, the second peak trap catches ranged from 10.67 to 126.67 moths/trap/week and third peak trap catches ranged from14 to108.67 moths/trap/week. Negligible to no moths were recorded during 28th and 39th SMW across all the locations during the study period.

Keywords

Population dynamics, flight period, peak moth activity, trap catches

Conclusion

It is quite fascinating to know that even though the cropping period varies considerable across wide paddy growing nations, moth activity period remains more or less same. Pheromone traps are now recommended against YSB. The current study shows that there are distinct flight periods when pheromone traps should be used; usage during other times will not only add to the cost, but also result in loss of farmers trust on the technology.

References

-

How to cite this article

Gangappa Nayak, Prabhuraj A., Sujay Hurali, S.G. Hanchinal, M. Bheemanna, B.G. Koppalkar and J. M. Nidagundi (2023). Studies on Population Dynamics of Yellow Stem Borer, Scirpophaga incertulas walker (Lepidoptera: Pyralidae). Biological Forum – An International Journal, 15(10): 192-198.