With increasing concern about the environmental impact of synthetic pesticide use, including their impact on beneficial insects, the problem of insect resistance and the lack of new products, there has been an increasing interest in developing alternative biopesticides to control insects and other pests. This collection reviews the wealth of research on identifying, developing, assessing and improving the growing range of biopesticides.Part 1 of this collection reviews research on developing new biopesticides in such areas as screening new compounds, ways of assessing effectiveness in the field and improving regulatory approval processes. Part 2 summarises advances in different types of entomopathogenic biopesticide including entomopathogenic fungi and nematodes and the use of Bt genes in insect-resistant crops. Part 3 assesses the use of semiochemicals such as pheromones and allelochemicals, peptide-based and other natural substance-based biopesticides.