Adult female is larger than male. Adult male is about 5.60 mm in length whereas adult female is 6.25 mm in length. Total life cycle of the beetle ranges from 21 days.[citation needed]
Eggs are bright yellow, with pyriform basally rounded and oval tip. Length of an egg is about 0.67 mm. The incubation period is about 3 days. There are three larval stages. First instar is yellowish and 1.26 mm in length. Initially second instar is also yellowish, but turn to blackish brown after an hour of feeding. Total length of second instar is about 2.64 mm. The third and final instar is about 5.59 mm in length and blackish brown. Total larval duration is about 13 days. Pupa is black and 4.58 mm in length.[citation needed]
It also feeds on aquatic weed Polygonum hydropiper. Adults feed by scraping the green tissues from the leaves. With infestation, remaining tissue also falls by producing a hole. Heavy infestation can cause all leaf tissue to removed with holes. Larval stages also scrap the green tissue to lower epidermis which produces holes of irregular shape. Heavy infestations with grubs lead leaves to dried up and become brownish.[citation needed]
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