Bioprotection or biocontrol can be used within an Integrated Pest Management (IPM) programme/approach. IPM can be described as an holistic approach to management of a pest by all available means, including the judicious use of chemical pesticides.
A more precise definition and the principles of IPM can be found on the EU Sustainable Use of Pesticides web page:
Why use biocontrol?
There are a number of very good reasons to use biopesticides and biological controls:
They are natural and have minimal environmental impact, plus they leave little or no toxic residues so we get cleaner and safer food.
They can introduce different modes of action to their chemical counterparts, reducing the selection pressure for pesticide resistance.
Many have zero or very low pre-harvest and re-entry intervals
Many products are highly specific to the target pest.
And many are perfectly compatible with standard spray equipment.
Nemaflor® (e-nema) which contains tiny worm-like nematodes that infect and kill pests such as thrips and leaf miners; and Trianum-G (Koppert Biological Systems) which contains a fungus that grows along the roots of plants and protects them from incoming disease
A good example of how biocontrol or bioprotection fits within an overall IPM strategy can be seen here: IPM Pyramid
Illustrations of how these components can be put together for specific crops can be seen in these panels from IBMA: IPM in practice
A quick guide to effective monitoring is provided in this short video from the UKs AHDB
EPN application in fruit trees
A useful guide to combination of EPNs with chemical pesticides can be found on the e-nema web site: EPN and pesticide compatibility
Similarly the Biobest Side Effect Manual is a useful tool to ensure maximum efficacy of your bioprotection product :
As for conventional pesticides care of personal hygiene and safety still needs to be considered. This video highlights the need for PPE in the use of the fungal biocontrol agent Metarhizium: