Comadia redtenbacheri Hamm. larvae are collected for human consumption in Mexico. The larvae often show different kinds of lesions, caused by ichneumonid or tachinid endoparasitoids, friction, or fungi. Lesions on agave red worm larvae caused by the parasitoids Acantholespesia texana (Aldrich & Webber) and Lissonota fascipennis Townes appear as an internal melanized structure, although the form and position vary depending on the parasitoid. It is possible to select healthy larvae by observing different kinds of lesions.