For many years the use of chemical agents such as pesticides and herbicides has been effective in controlling the many varieties of pests that infest both agricultural crops and backyard gardens.
However, these pests are gradually becoming resistant to these agents, because the agents themselves are acting as selective factors making the pests better and better able to resist and persist.
As a result, the use of biological controlling agents is increasing.
This book is a comprehensive and authoritative handbook of biological control.
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