The insecticides thiamethoxam and chlorantraniliprole do not have side effects on the midgut of the predator Chrysoperla externa (Neuroptera: Chrysopidae)

Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae) is a predator of phytophagous pests in crops; however, this natural enemy may be exposed to chemical insecticides. Thiamethoxam (neonicotinoid) and chlorantraniliprole (anthranilic diamide) are classified as selective insecticides, but their side effects on the midgut of non-target organisms are poorly understood. This study aimed to assess the toxicity and side effects of thiamethoxam and chlorantraniliprole on the midgut of C. externa larvae and adults. Chrysoperla externa larvae and adults were fed eggs of Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) and a honey solution, respectively, both containing the insecticides. Mortality rates were evaluated. Histopathological examination of the midgut was conducted on larvae and adults exposed to the calculated LC₅₀ at one, 12, and 30 days after exposure. The results showed that both insecticides did not induce histopathological or cytotoxic effects on the midgut cells of C. externa larvae and adults. These findings suggest that thiamethoxam and chlorantraniliprole, in low concentrations, have potential to be utilized in integrated pest management strategies involving this natural enemy.