make use of naturally occurring pest killers such as fungi,
nematodes to attack pest species.
These can be mass produced and applied in much the same way as synthetic
insecticides or, in some cases, e.g some transgenic cottons, the
toxic protein from the bacterium is produced in the plant.
has a successful research record on the use of pathogens to control
insect pests e.g nematodes to control Sirex wasp in pine