Current control of pests in agriculture is done mainly using mineral fertilizers and toxic pesticides. Alternative solutions are thus needed due to concerns for public health, environmental protection, and development of resistant pests. Chitosan, obtained from exoskeletons of crustaceans and insects, showing both antimicrobial and plant-immunity eliciting properties. Agronomists Xing et al. explain that chitosan, a material obtained from exoskeletons of crustaceans and insects, can be used to enhance natural plant defenses. Chitosan also displays antimicrobial properties.