Research article

Sublethal effects of Proteus on the demographic characteristics of Tetranychus urticae Koch 1836

Mohammad Nasir Shaterian Mohammadi1, Ayad Kadhim Alsendi1, Hayder Abdulhasan Ali ² and Ali A. Kareem2

Online First: November 08, 2022

Tetranychus urticae Koch (Trombidiformes: Tetranychidae) constitutes a significant member of the agricultural product family. Applying sublethal concentrations minimizes the requirement for pesticides while also curbing the issue of resistance in pests. This constitutes an integral part of Integrated Pest Management (IPM) and effective control over the pest population. The infectious effects (LC10, LC20, LC30) belonging to Proteus within demographic factors associated with T. urticae age-wise, theory of two-sex life table got tested in a controlled laboratory environment [25 ± 2C, 60 ± 5% R.H, 16:8 (L:D) h]. The results showed that T. urticae adults exposed to LC10, LC20, LC30 belonging to Proteus; a sharp decrease was noted in fecundity and oviposition period compared against control settings. Subjecting to infectious Proteus concentrations did not affect the progeny of APOP's treated mites. The intrinsic increase rate (r) ranged from 0.233 day-1 for the mites exposed to distilled water to 0.197 per day for LC30 treatments of Proteus. The acaricide concentration affected the finite increase rate (λ) (low value at LC30 conc.: 1.1217 day-1). Due to the obtained data, comparing the effect Proteus casts on T. urticae's population growth, this pesticide has been shown to effectively control both spider mites with spotted skin in the form of integrated pest management.


Life table parameters, Sub-lethal effects, Tetranychus urticae, Proteus