Abstract
Laboratory studies were conducted to determine the susceptibility of nine mosquito predators to the microsoporidian pathogen of anopheline mosquitoes, Nosema algerae. The predators tested were: Anax junius (Odonata); Hydrophilus sp., Coptotomus interrogatus (Coleoptera); Notonecta undulata, Belostoma fluminea, Ranatra australis (Hemiptera); Chauliodes rastricornis (Megaloptera); Procambarus sp. (Decapoda); and Gambusia affinis (Pisces). Of these species, only Notonecta undulata was found to be susceptible to Nosema algerae after having fed upon diseased larvae. Infection rates in four tests averaged 47.9%. The following tissues were found to be infected in the adult notonectids: gut, muscle, fat body, Malpighian tubules, tracheal epithelium, testes, brain, hypodermis, and ommatidia.
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