Pesticide Benefits Disease control -e.g, malaria caused by female Anopheles mosquitoes Crop protection -reduce loss from competition with weeds, consumption by insects, and disease caused by fungi and bacteria. Part of reason for large numbers of agricultural pests is emphasis on monoculture in large tracts of landPesticide Benefits Disease control - e.g., malaria caused by female Anopheles mosquitoes. Crop protection - reduce loss from competition with weeds, consumption by insects, and disease caused by fungi and bacteria. Part of reason for large numbers of agricultural pests is emphasis on monoculture in large tracts of land