How Is Fitness of Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) Affected When Different Developmental Stages Are Exposed to Chlorfenapyr?

Abstract

Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) is an important pest of stored products. Insecticidal treatment is a common practice for the control of this notorious insect pest. Most studies are focused on the immediate and/or delayed mortality effects, while there are no data on the effects of insecticides on the population fitness. This study deals with the effect of chlorfenapyr on T. castaneum, investigating the cost of exposure of different developmental stages on population performance, by using life table statistics and a survival analysis method. For this purpose, eggs, larvae, and parental adult females of T. castaneum were exposed to chlorfenapyr and birth or death rates were calculated daily. The exposure of eggs and larvae to chlorfenapyr was detrimental for T. castaneum and they did not complete development. When parental females were exposed to chlorfenapyr, the progeny survival curve, biological features, as well as the life table parameters did not differ significantly compared to the control treatment. Thus, egg hatching, larval and pupal developmental periods, female and male longevities for the control treatment, and the progeny of the females that were exposed to chlorfenapyr were 4.66 and 4.76 days, 25.85 and 25.71 days, 5.00 and 5.26 days, 87.33 and 104.22 days, and 76.87 and 91.87 days, respectively. In addition, the mean values of the net reproductive rate, the intrinsic rate of increase, the mean generation time and the doubling time for the control treatment and the progeny of the parental females which were exposed to chlorfenapyr were 14.3 and 9.3 females/female, 0.038 and 0.028 females/female/day, 1.039 and 1.029, 70.0 and 76.9 days, and 18.5 and 24.9 days, respectively. We expect these results to have bearing on the management of T. castaneum, since the repeatedly insecticidal applications could be reduced in storage facilities.

Study on Gas Chromatographic Fingerprint of Essential Oil from Stellera chamaejasme Flowers and Its Repellent Activities against Three Stored Product Insects

“…Due to their strong adaption, rapid breeding ability and worldwide distribution, the above three insects have caused serious problems including agricultural economic loss, food contamination and health risks to consumers, etc. [12,13]. Therefore, pesticides such as synthetic insecticides have been widely used to control these stored product pests, in the meantime, overuse of synthetic chemical insecticides leads to environmental pollution, unexpected toxicity on the nontarget biosome and endangerment of human health [14,15].…”

Exposure of <em>Tribolium</em> <em>castaneum</em> (Herbst) (Coleoptera: Tenebrionidae) Females to Spinosad: Effect on the Fitness of Their Progeny

“…It infests several commodities such as cereal grains, nuts, spices, chocolate, cacao, dried fruits and animal products [2]. A common method to reduce T. castaneum infestations in stored-products is the application of insecticides [3,4,5]. However, due to the economic importance of this species, as well as its tolerance to several insecticides [4], a precise evaluation of the management strategies seems imperative and important for its control.…”

“…This method is appropriate in for the estimation of time-varying processes such as insect survival and reproduction through time [4] and has been widely used in order to evaluate the potential population increase of insects [6,7,8,9]. However, it is rarely applied to evaluate the efficacy of insecticides [4,5,10]. Therefore, aim of this study is to explore possible indirect effects of spinosad on T. castaneum.…”