Effect of Leaf Extracts of Medicinal Plants on Feeding, Larval
Growth and Defecation of Woolly-Bear Caterpillar, Pericallia
ricini (F.) (Arctidae : Lepidoptera) on Castor Bean
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Author:M. Jamal Mohamed and A. Abdul Kareem
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:97, Issue:apr-jun
DOI: https://doi.org/10.29321/MAJ.10.100373
Abstract
The present study indicates that leaf powder extract of Vinca rosea L. 5.0 and 2.5 per cent
were highly effective in reducing the food consumption, larval body weight and faecal matter
voided by Pericallia ricini under laboratory conditions. Caterpillars consumed very less
amount of castor leaves treated with V. rosea leaf powder extracts 2.5 and 5.0 per cent (i.e.
0.444 and 0.263g, respectively) compared to untreated control. The consumption was 0.483g
per four caterpillars in the castor leaves treated with neem leaf powder extract 5.0 per cent.
Larvae fed by V. rosea 5.0 per cent, neem leaf powder 5.0 per cent and V. rosea leaf powder
2 .50 per cent treated leaves voided 0.430, 0.497 and 0.627 g of faecal matter per four caterpillars,
respectively. Larval body weight was decreased to 80.63 per cent in V. rosea 5.0 per cent over
untreated check. It was followed by V. rosea 2.5 per cent and neem 5.0 per cent and registered
71.26 per cent decrease in body weight over the untreated check. The extracts of V. rosea
exhibited feeding inhibition or gustatory repellency or impairment in food assimilation and
imbalance in enzyme activity
Key words : Pericallia ricini, food consumption, body weight, faecal matter, Vinea rosea, neem.