1) Biological pest control 2) Chemical 
killing of larvae
Substance intended to kill larvae.
Kills the larvae of insects.
An agent that kills larvae. ... Origin: Larva + L. Caedo, to kill ... (05 Mar 2000) ... 
(lahr´vĭ-sīd) an agent that kills insect larvae.
When an insecticide is used as a control against the larval stage of a pest, it is termed a larvicide. Usually the larval stage in such cases is easier to reach or it is more vulnerable to insecticides than other stages in the life cycle.
Type: Term Pronunciation: lar′vi-sīd Definitions: 1. An agent that kills larvae.
[n] - a chemical used to kill larval pests
larvicide, larvicidal A preparation adapted to kill larvae.
noun a chemical used to kill larval pests