Effects of three conventional insecticides on life table parameters and detoxifying enzymes activity of Pulvinaria aurantii Cockerell (Hemiptera: Coccidae)

Abstract

The effects of chlorpyrifos, pyriproxyfen and acetamiprid were examined on life table and detoxifying enzymes of Pulvinaria aurantii Cockerell. The LC₅₀ values were 215.1, 92.8 and 126.7 ppm for tested pesticides, respectively. Low lethal concentration (LC₃₀) of pyriproxyfen had the highest severe effect on life table parameters of P. aurantii. The intrinsic rate of increase was reduced to 0.161 day⁻¹ in pyriproxyfen treatment as compared with 0.180 day⁻¹ in the control. The lowest enzymatic activities were recorded for first instar treated with chlorpyrifos. The combination of lethal and sublethal effects of pyriproxyfen can be incorporated in management of this pest.

Keywords:

• Sublethal effect
• insect growth regulator
• esterases
• glutathione-S-transferase
• the orange pulvinaria scale

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research received financial support by the University of Mohaghegh Ardabili which is greatly appreciated.