"There is no effective insecticide for the beetle," Dr. Magnarelli said.

Tansy is an effective insecticide, and is highly toxic to arthropods.

The companies said knowledge of the genes should allow them to develop more effective insecticides.

Paul Müller discovered that DDT was a very effective insecticide.

Monocerin has also been shown to be an effective insecticide against wooly aphids.

A component in the resin is an effective insecticide; see azadirachtin.

It is the cheapest, longest lasting and most effective insecticide, and it will not threaten the ecosystem.

Dieldrin was developed as an alternative to DDT and has proved to be a highly effective insecticide.

Spot application of pesticides; however, most effective insecticides are obtainable only by certified professionals.

It has recently been recognized as a very effective insecticide for mosquito larvae.