Influence of short time exposure to an insect growth regulator, hexaflumuron, on mortality and adult emergence of vector mosquitoes

Abstract

Hexaflumuron, an insect growth regulator (IGR), was found to greatly affect the development of immatures and emergence of adults of three species of vector mosquitoes, Culex quinquefasciatus, Aedes aegypti and Anopheles stephensi, when larvae were subjected to short time exposure of < or = 1 h. This IGR could completely prevent adult emergence even at a minimum exposure time of 10 min at 0.001, 0.01 and 0.1 mg/l. On treatment, larval and pupal mortality as well as varying degrees of morphogenetic abnormalities were induced in immatures and adults of the three species. Four weeks of control achieved in a slow moving sullage canal breeding Culex quinquefasciatus indicates that this IGR can be of use in such breeding habitats.

Decrease in Pupation and Adult Emergence of Plutella xylostella (L.) treated with Hexaflumuron

“…In accordance with the present study, Marco and Viñuela (1999) observed that sublethal hexaflumuron concentrations had a significant decrease on the percentage of pupation and adult emergence rate of Ephestia kuehniella Zeller (Lepidoptera: Pyralidae). Vasuki and Rajavel (1992) also stated that hexaflumuron significantly decreased the adult emergence rate of Anopheles stephensi (Diptera: Culicidae). Analogous to this study's results, Mahmoudvand et al (2011b) reported that sublethal concentrations of indoxacarb decreased the pupation rate and adult emergence of P. xylostella in the parent generation, but that these parameters were unchanged in the next generation.…”

“…It has ingestion, contact, and ovicidal toxicity (Sbragia et al, 1983;El-Barkey et al, 2009;Mahmoudvand et al, 2011a). The impacts of hexaflumuron's sublethal effects on insects have been previously examined (Vasuki and Rajavel, 1992;Coppen and Jepson, 1996;Marco and Castañera, 1996;Abo-Elghar et al, 2003;Kellouche and Soltani, 2006;Bakr et al, 2009).…”

Effect of the chitin synthesis inhibitor triflumuron on the development, viability and reproduction of Aedes aegypti

“…There are reports of structural defects produced by treatment with CSI in several insect orders (Demark & Bennet 1989, Wilson & Cryan 1997, Da-Silva et al 2004). Vasuki and Rajavel (1992) observed that treatment of the mosquitoes Cx. quinquefasciatus, Ae.…”

“…Additionally, adults deriving from CSI-exposed larvae can exhibit a series of physiological constraints that ultimately lead to diminished physical and reproductive fitness (Mondal & Parween 2000). These CSI effects vary according to the species, the developmental stage at the time of application, the kind of compound and the administered dose (Vasuki & Rajavel 1992, Wilson & Cryan 1997. Although several reports in the literature explore the direct effects of CSIs, such as mortality or adult emergence inhibition (Rehini & Soltani 1999, Batra et al 2005, the consequences of IGR use on the surviving adults and their implications in vector fitness are less considered, especially among Culicidae (Vasuki 1992, 1999, Vasuki & Rajavel 1992.…”

Effect of Temperature and Insecticide Stress on Life-History Traits of Culex restuans and Aedes albopictus (Diptera: Culicidae)

“…In addition, thermotolerance has been shown to confer cross-tolerance to some insecticides in mosquitoes (e.g., Anopheles stephensi Liston, Aedes aegypti L., Patil et al 1996). These effects coupled with the known inßuence of temperature and insecticides on mosquito survival, life-history traits, and overall population performance (Robert and Olson 1989, Vasuki and Rajavel 1992, Bayoh and Lindsay 2004, Antonio et al 2008, Delatte et al 2009) suggest that the interaction of temperature and insecticides may play an important role in disease transmission. Temperature stress may aggravate the negative effect of insecticide on mosquitoes either by increasing their sensitivity to insecticide or enhancing insecticide toxicity.…”