Antifeedant properties of some plant extracts against brinjal hadda beetle, Henosepilachna vigintioctopunctata F.

Petroleum ether extract of three plants, viz., Ageratum, Lantana camara and Eupatorium were evaluated in the laboratory for their antifeedant action against the grubs and adults of brinjal hadda, Henosepilachna vigintioctopunctata (Fab). All the plant extracts showed varying degree of antifeedant effects. One per cent concentration of each of Ageratum and Lantana extracts gave complete protection to brinjal leaves against feeding by 1st, 2nd and 3rd instar grubs. In the case of adults, maximum antifeedant effect was exhibited by the extract of Lantana (1%) followed by Eupatorium (1%). The remaining two concentrations (0.5 and 0.25%) of each of the three plant extracts were effective as antifeedant but to a lesser degree as compared to 1% concentration.