Fitness Trade-Offs and Potential Metabolic Resistance Mechanisms in Geographically Distinct Strains of <i>Trichogramma dendrolimi</i>: Implications for Imidacloprid Resistance Management.

ABSTRACT: The widespread use of neonicotinoid insecticides has led to increasing resistance in non-target organisms, including the egg parasitoid Trichogramma dendrolimi, a crucial biological control agent. Film-residue bioassays on 17 geographic strains revealed striking inter-strain variability in susceptibility to imidacloprid, with mortality at a discriminating dose of 0.1 mg/L ranging from 25.7% to 87%. The most tolerant (FS) and least tolerant (HA) strains were subsequently selected for evaluation of biological parameters and comparative transcriptomics. Tolerant strains (FS) showed adaptive trade-offs: extended longevity (5.47 ± 0.57 d) and emergence (93.6 ± 1.9%), but reduced fecundity (54.6 ± 4.9 eggs) compared to HA. Transcriptome analysis revealed 2115 differentially expressed gene

SUBMITTER: Li YT 

PROVIDER: S-EPMC12565574 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature