DEVELOPMENT OF IMMATURE STAGES OF LEAF CUTTING WEEVIL, Eugnamptus marginellus UNDER DIFFERENT LEVELS OF CONSTANT TEMPERATURE

Abstract

The development and viability of the leaf cutting weevil, Eugnamptus marginellus Fst. was evaluated under laboratory condition at seven different constant temperatures, viz., 14±1°C, 15 1°C, 20±1°C, 25±1°C, 30±1°C, 35±1°C and 36 ± 1°C. Freshly laid eggs were allowed to incubate separately at seven temperature regimes and allowed to develop till adult emergence. There was decrease in egg perind with increase of temperature from 15 ± 1°C - 35±1°C and with the increase of temperature from 15±1°C-35 ± 1°C there was increase in hatching percentage but the rate of hatching was lowered at 35 ± 1°C. None of the eggs hatched at lower temperature below 15+ I°C and upper temperatures above 35 ± 1°C indicating threshold level for egg development. The larval, prepupal and pupal period were found to decrease with the increase of temperature from 15± 1°C-30±1°C and 25±1°C-30±1°C but none of the prepupal larvae transformed into pupae when exposed to 151°C-20±1°C.

DOI

https://doi.org/10.29321/MAJ.10.A00879

Pages

267 - 271

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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