Spraying for insects, fungi and weeds is a big part of any commercial growing, this is because of a fear things might get out of hand - which they certainly will if left to their own devices. In nature a functioning ecosystem is full, it's hard for a species to get a foot hold then take over. Spraying creates a vacuum that most certainly will be reinvaded. Natural growing aims to create a balance, controlling head predators allows small birds to thrive unmolested. They in turn then spend all day inspecting every leaf for insects and eating them. An astonishing number of pests have been harvested trying to come on to our land. The simple age old country arts of trapping and hunting are easy, fun and effective.
This photo was taken by David Mudgeway, rats are determined clever predators of Fantails nests.