Fill in the blanks (a) ______ beetle with red and black markings is useful in controlling aphids.
Channel: Doubtnut
Date: 2020-02-17

Fill in the blanks (a) ______ beetle with red and black markings is useful in controlling aphids. (b) Species specific narrow spectrum insecticidal applications are shown by ______ . (c ) In paddy fields ______ serve as an important biofertilisers.