Relative Abundance of Legume Pod Borer, Maruca vitrata Geyer (Lepidoptera: Crambidae) on Pigeonpea and its Relationship with Weather Parameters

Abstract

Legume pod borer, Maruca vitrata Geyer is one of the serious pests occurring during flowering and pod formation stage of pigeonpea. Relative abundance of M. vitrata studied in pigeonpea variety, CORG 7 during Kharif and Rabi seasons of 2011 and 2012 at Department of Pulses, TNAU, Coimbatore revealed that in 2011, the first peak incidence was during 34th SMW (IV week of August) and 36th (I week of September) SMW as 4.44 and 3.68 webbings/ plant respectively followed by the second peak during 50 (II week of December) and 52 nd (IV week of December) SMWs as 9.38 and 5.72 webbings per plant respectively. In 2012, on 50 and 52 nd SMWs (II and IV weeks of December) the peak incidence of 6.21 and 5.10 webbings per plant were recorded respectively. The larval incidence showed a significant negative correlation with maximum temperature (r=0.455*), sunshine hours (r=0.382*) and evaporation (r=402*) and positive correlation with minimum relative humidity (RH) (r=0.399*) and rainfall (r=0.463*). Regression analysis showed all abiotic factors together determine the variation in Maruca damage by 61.4 per cent (R 2 = 0.614).

DOI

https://doi.org/10.29321/MAJ.10.001069

Pages

67 - 70

Creative Commons

Copyright

© The Author(s), 2025. 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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