Investigation on The Effects of Several Plant Extracts and Thiamethoxam on Two Sex Life Table of Chrysoperla carnea (Stephens) (Neu.: Chrysopidae) in Laboratory Conditions

Document Type : Research Article



Demographic toxicology is a common method for investigation on the sub lethal effects of pesticides on natural enemies. The side effects of plant extracts from root of madder (Rubia tinctorum L.), seeds of dill (Aniethum graveolens L.) and seeds of Galbanum (Ferula gummosa Boiss.) in comparision with thiamethoxam were evaluated on life table parameters of C. carnea as Agonoscena pistaciae predator, under laboratory conditions at 25± 2, 65± 5% RH and 16:8 (L: D) photoperiod.The first instar larvae were assayed using Potter Spray Tower method.. Results showed significant differences (p≤0.01) among treatments for gross reproductive rate (GRR), net reproductive rate (R0 or NRR), intrinsic rate of increase (rm), finite rate of increase (λ) and mean generation times (T).The highest to lowest of gross and net reproductive rate were observed in A. graveolens, R. tinctorun, thiamethoxam and F. gummosa parviflora, respectively. The maximum intrinsic rate of increase (rm) and finite rate of increase (λ) were observed in A. graveolens and R. tinctorun and minimum in thiamethoxam. Thus, the immunity was observed in A. graveolens and R. tinctorun respectively while thiamethoxam and F. gummosa showed the highest inhibiting effect on stable population growth parameters. Two extracts, A. graveolens and R. tinctorun were the best choices, because of their immunity on C. carnea as a biological control agent.