Common Insect Contaminants Found in Arizona Lettuce

Abstract

Lettuce produced in Arizona is susceptible to contamination by a variety of insect pests that can affect both market quality and food safety. This guide identifies common insect contaminants—including western flower thrips, aphids, leafhoppers, beet armyworms, and false chinch bugs—and describes their sources, behavior, and potential impact on harvested lettuce. Many of these pests migrate from surrounding crops or weedy areas and are often hidden between leaves or under the cap leaf, making detection challenging. Understanding their habits is critical for effective monitoring and contamination prevention strategies.