Speaking at the Brassica Growers Association conference, she said: "A new regulatory system in Europe means that we will see many more substances coming through. The Sustainable Use Directive encourages non-chemical methods of pest control."
The industry is moving very fast in response, she added. "It has gone hi-tech, with large-scale, very clean production."
But she cautioned: "We need to get more knowledgeable about their use. What is the interaction with conventional chemicals - alternate, synergy or antagonism?"
Even biological agents not classed as "controls" - causing more than 80 per cent control of a given pest - may still have a role in a mixed programme of control, added Gwynn.