Halfmoon shaped scarping or notching of the brinjal leaves are due to

Halfmoon shaped scarping or notching of the brinjal leaves is due to Myllocerus subfasciantus.
Myllocerus subfasciatus is a species of weevil found in India and Sri Lanka. Adults are known to attack brinjal. Common symptom is the notching of leaf margins. Grubs generally feed on roots causing wilting.
Both adults and grubs scrap the lower epidermis of leaves in a characteristic manner leaving behind stripes of uneaten areas. The leaves give a stifled appearance.