Natural insecticide is effective in killing mosquito larva in ponds. Myristicinm, a synthesized compound found in parsnips and bacillus thuringiensis is effective as a selective insecticide against the larva.

The leaves of molasses grass and sassafras are mosquito repellants. Castor beans, planted around a garden, will also repel mosquitoes.

A native American plant called "American Pennyroyal"  AKA "squaw mint" is a natural insect repellant.  A handful, crushed and rubbed on the skin, will not only emit a pleasant smell but also repel mosquitoes and gnats.