Sublethal Dose Impact of λ Cyhalothrin on Life Table Parameters of Ladybird Beetle, Coccinella septempunctata (Coleoptera: Curculionidae) Reveals Tolerance in Field Population
Sublethal Dose Impact of λ Cyhalothrin on Life Table Parameters of Ladybird Beetle, Coccinella septempunctata (Coleoptera: Curculionidae) Reveals Tolerance in Field Population
Muhammad Rizwan1*, Bilal Atta1, Muhammad Arshad2, Sohail Akhter3,
Muhammad Tahir3, Misbah Rizwan1, Muddassir Ali1 and Arshad Makhdoon Sabir1
ABSTRACT
Insecticides are a quick tool to suppress insect pests and an important element of integrated pest management (IPM). λ cyhalothrin, a pyrethroid, is commonly used to manage economic insect pests in agricultural crops since long. An assay was designed to evaluate the efficacy of λ cyhalothrin on biological parameters of generalist predator, Coccinella septempunctata. Results indicated that λ cyhalothin has no significant impact on developmental life stages of larvae of ladybird beetle but it significantly reduced the span of total adult longevity (30.8 to 26.91 d), female adult longevity (31.5 to 27.79 d), and male adult longevity (29.4 to 25.56 d) as compared to control. Among population parameters, λ cyhalothin had a non-significant impact on adult preoviposition (APOP), total preoviposition period (TPOP), oviposition period, intrinsic rate of increase, finite rate of increase, and mean generation time (T). However, it had significantly reduced the fecundity of females from 294.00 to 262.43 eggs/female and net reproductive rate (R0) (174 to 91.85 d). Our results showed that C. septempunctata had adopted to manage λ cyhalothrin and it could be used in experiments involving C. septempunctata as a natural biocontrol agent.
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