The present study evaluates the nature of feeding damage of
Epilachna vigintioctopunctata on leaves of Solanum melongena L.
and antifeedant activities of essential oil formulations against E. vigintioctopunctata.
Investigations were made on the morphological and anatomical damage caused by
the feeding activity of the adults and grubs of E. vigintioctopunctata.
Adult E. vigintioctopunctata scraped the green matter of the upper and
lower sides of the leaves of Solanum melongena leaving behind only a
network of veins. This characteristic scraping made the leaves papery and the
infested eggplants exhibited inter venal damage or holes on the leaves. The
reduction percentage of leaf fresh weight and leaf dry weight in infested leaves
after one generation were 11.4 and 15.2%, respectively. In the grub infested
leaves of eggplant, fully damaged epidermis, parenchyma cells and phloem cells
of vascular bundles were observed. The total mean percentage of infested leaf
damage was 12.75±0.43%. Maximum antifeedant activities of 80.06, 61.92%
were observed in oil formulation III and formulation I, respectively at 100
ppm concentration against the fourth instars grub of E. vigintioctopunctata.
This would be a good alternative for the chemical pesticides.
Ponnuvel Mohanchander, Appadurai Daniel Reegan, Mohamed Ashiq Ur Rahman and Raja Singh Raveen, 2013. Effect of Hadda Beetle, Epilachna vigintioctopunctata Fab. (Coleoptera:
Coccinellidae) Infestation on Eggplant Leaf (Solanum melongena L.) and
Bio-control Potential of Essential Oil Formulations. Pakistan Journal of Biological Sciences, 16: 991-997.