Various microbial insect diseases occur naturally, but may also be used as biological pesticides.

It shows promise as a biological pesticide with an extensive host range.

A biological pesticide to control locusts was being tested across Africa by a multinational team in 1997.

Another advantage is that biological pesticides like this one do not affect other insect species.

It can therefore be considered as a biological pesticide.

Microbial and biological pesticides contain living organisms that must be consumed by the pest.

To the uninitiated, it might seem that biological pesticides would be an easy sell.

Fungi have turned out to be among the most promising of the new biological pesticides.

Although such biological pesticides appear to kill only grasshoppers and locusts, critics question whether they are selective enough.

Fungi are also used as biological pesticides to control weeds, plant diseases and insect pests.