Akademik Veri Yönetim Sistemi
SYSTEMATIC AND APPLIED ACAROLOGY, cilt.30, sa.9, ss.1632-1648, 2025 (SCI-Expanded, Scopus)
Understanding the sublethal effects of pesticides is crucial for evaluating their ecological impact on pest
populations. This study investigated the demographic responses of Tetranychus urticae Koch (Acari:
Tetranychidae) to sublethal concentrations of acequinocyl, which is widely used to control T. urticae. We
examined the effects of LC₁₀ and LC₂₅ concentrations of acequinocyl on key life history traits, including
developmental duration, longevity, fecundity, and population growth parameters, using an age-stage, two-sex
life table approach. The experiments were conducted under controlled laboratory conditions, maintained at 27
± 1°C, 70 ± 5% relative humidity, and a 16:8 light: dark cycle. Phaseolus vulgaris served as the host plant for
T. urticae throughout the study. Although there were statistical differences in some periods of pre-adult
development in females and males compared to the control, the total pre-adult period was found to be the same
as the control in both sublethal concentrations. Female longevity was significantly prolonged at the LC₂₅
treatment, whereas male longevity decreased. No significant differences were observed among treatments for
APOP and TPOP durations, but egg production was significantly higher in the LC25 treatment. Similarly, the
oviposition period was extended in the LC25 treatment. Life table parameters revealed no significant differences
in the intrinsic rate of increase (r), finite rate of increase (λ), or net reproductive rate (R0 ) among treatments.
However, the mean generation time (T) was significantly longer in the LC25 treatment. The gross reproductive
rate (GRR) was significantly higher in the LC25 treatment relative to the control, while the offspring per female
ratio (Nf /N ) was significantly lower in both sublethal concentrations. The results demonstrated significant
concentration-dependent effects on T. urticae. These findings highlight the dual impact of acequinocyl: while it
enhances reproductive output, it simultaneously suppresses population growth by reducing survival and altering
sex ratios. This underscores the critical need for careful evaluation of sublethal concentrations in pest
management strategies, as they can significantly influence the population development of T. urticae both in the
short and long term.