Akademik Veri Yönetim Sistemi
Crop Protection, cilt.203, 2026 (SCI-Expanded, Scopus)
In this study, the sublethal effects of deltamethrin, cypermethrin and chlorantraniliprole on Diuraphis noxia (Kurdjumov) (Hemiptera: Aphididae) were compared. Under controlled laboratory conditions, the LC50 values were 4.896 μl/L for deltamethrin, 2.808 μl/L for cypermethrin, and 3.245 μl/L for chlorantraniliprole. Bioassays at sublethal concentrations (LC30, LC40, and LC50) showed that all insecticides prolonged nymphal development, shortened adult longevity, and reduced fecundity. Total fecundity in the control group was 60.74 ± 1.45 offspring per female, while this decreased to 18.65 ± 0.738 offspring per female at the LC50 level of deltamethrin. Life table analyses showed that the intrinsic rate of increase (r) decreased from 0.284 ± 0.004 in the control to 0.099 ± 0.008, 0.149 ± 0.005, and 0.159 ± 0.005 for deltamethrin, cypermethrin, and chlorantraniliprole at LC50, respectively. Similarly, the net reproductive rate (R0) declined from 60.74 in the control to 8.58 under deltamethrin LC50 exposure, while the mean generation time (T) increased from 14.45 to 21.75 days. These results indicate that sublethal exposure significantly suppresses the population growth of D. noxia. Among the insecticides tested, deltamethrin caused the greatest biological and demographic suppression, while chlorantraniliprole, despite its comparatively lower toxicity, still led to significant reductions in reproductive traits. Overall, the findings highlight the importance of considering sublethal concentrations when evaluating long-term population regulation and potential resistance development in pest management programmes.