Side effects of toxic bait formulations on Diachasmimorpha longicaudata (Hymenoptera: Braconidae)

摘要

Diachasmimorpha longicaudata (Ashmead, 1905) (Hymenoptera: Braconidae) is considered one of the main biological control agents of Ceratitis capitata (Wiedemann) (Diptera: Tephritidae). However, the application of toxic baits for the management of C. capitata might exert side effects on the parasitoid. The objective of this study was to evaluate the side effects of toxic bait formulations on D. longicaudata. The food attractants Anamed, 3% Biofruit, 1.5% CeraTrap, 1.25% Flyral, 3% Isca Samaritá, 3% Isca Samaritá Tradicional, and 7% sugarcane molasses mixed with an organophosphate insecticide [malathion, 2.0 grams of active ingredient (g a.i.) L⁻¹] and the commercial formulation Gelsura (2.0 and 4.0 g a.i. L⁻¹ alpha-cypermethrin) showed high toxicity to D. longicaudata adults (>90% mortality) after 96 h and were thus classified as harmful (Class 4). Similarly, 3% Isca Samaritá Tradicional and 7% sugarcane molasses in formulations with the insecticides spinosad and spinetoram (0.096 g a.i. L⁻¹ or kg) were moderately harmful (Class 3). In contrast, the food attractants Anamed, 3% Biofruit, 1.5% CeraTrap, 1.25% Flyral, and 3% Isca Samaritá Tradicional in combination with spinosad and spinetoram and the formulation Success 0.02CB (0.096 g a.i. L⁻¹ spinosad) were classified as harmless (<10% mortality up to 96 h, Class 1). Additionally, these formulations did not reduce the parasitism and emergence rate of the F1 generation of D. longicaudata in C. capitata larvae. Formulations of toxic baits based on spinosyn are suitable for the management of C. capitata together with the parasitoid D. longicaudata.