Seasonal Incidence of Pod Borer Complex- Spotted Pod Borer, Maruca Vitrata (Geyer) and Pea Blue Butterfly, Lampides Boeticus (Linnaeus) in Black Gram In Relation To Weather Parameters

Abstract

Seasonal incidence of the spotted pod borer M. vitrata showed that the larval incidence appeared first at 42nd SW (14 larvae/ 50 plants) and had its highest peak at 45th SW (52 larvae/ 50 plants) during Kharif 2020. During Rabi 2020 – 2021, the pest appeared from 13th SW onwards (12 larvae/ 50 plants) and reached its highest peak at 16th SW (42 larvae/ 50 plants). Studies on seasonal incidence revealed that the peak population of the pod borers, spotted pod borer M. vitrata showed that the peak larval incidence at 45th Standard Week (SW) (52 larvae/ 50 plants) and at 16th SW (42 larvae/ 50 plants), the larval incidence of the pea blue butterfly, L. boeticus had its highest peak at 44th SW (52 larvae/ 50 plants) and 16th SW (46 larvae/ 50 plants) during Kharif 2020 and Rabi 2020 – 2021, respectively. The correlation study showed that a positive correlation was observed for M. vitrata at maximum (0.79) and minimum temperature (0.24), and rainfall (0.17). Negative correlation was recorded with maximum (-0.09) and minimum relative humidity (RH) (-0.12) and a positive correlation was observed with maximum (0.68) and minimum temperature (0.65), minimum RH (0.04) and rainfall (0.36). Negative correlation was recorded with maximum RH (-0.62), in L. boeticus a positive correlation was observed between the incidence of and maximum temperature (0.74), maximum (0.16), and minimum RH (0.13) and rainfall (0.33), a negative correlation was recorded with minimum (-0.15) and a significant positive correlation was observed with maximum (0.70) and minimum temperature (0.71), and minimum RH (0.17) and rainfall (0.43), while a negative correlation was recorded with maximum RH (-0.59) during Kharif 2020 and Rabi 2020 – 2021, respectively.

DOI

https://doi.org/10.29321/MAJ.10.112032

Pages

15 - 20

Creative Commons

Copyright

© The Author(s), 2026. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

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