scholarly journals Susceptibility of South Texas Aedes aegypti to Pyriproxyfen

Insects ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 460
Author(s):  
Jose G. Juarez ◽  
Selene M. Garcia-Luna ◽  
Christopher M. Roundy ◽  
Alyssa Branca ◽  
Michael G. Banfield ◽  
...  

An integral part to integrated mosquito management is to ensure chemical products used for area-wide control are effective against a susceptible population of mosquitoes. Prior to conducting an intervention trial using an insect growth regulator, pyriproxyfen, in South Texas to control Aedes aegypti, we conducted a larval bioassay to evaluate baseline levels of susceptibility. We used seven serially-diluted doses ranging from 2.5 ppb to 6.3 × 10−4 ppb. We observed 100% inhibition emergence (IE) at even the lowest dose of 6.3 × 10−4 ppb in our susceptible reference colony of Ae. aegypti Liverpool. In our field strain of Ae. aegypti (F5 colonized from South Texas) we observed 79.8% IE at 6.3 × 10−4 ppb, 17.7% IE at 1.25 × 10−3 ppb, 98.7% IE at 1.25 × 10−2 ppb, and 100% emergence inhibition for the remainder of the doses. Given that commercial pyriproxyfen products are labeled for doses ranging to 50 ppb, we conclude that the field population sampled by this study are susceptible to this insect growth regulator.

2012 ◽  
Vol 103 (3) ◽  
pp. 269-277 ◽  
Author(s):  
N.M. Endersby ◽  
A.A. Hoffmann

AbstractTwo stable infections of Wolbachia pipientis, wMelPop and wMel, now established in Aedes aegypti, are being used in a biocontrol program to suppress the transmission of dengue. Any effects of Wolbachia infection on insecticide resistance of mosquitoes may undermine the success of this program. Bioassays of Ae. aegypti were conducted to test for differences in response to insecticides between Wolbachia infected (wMelPop, wMel) and uninfected lines. Insecticides screened were bifenthrin, the pyrethroid commonly used for adult knockdown, as well as larvicides: Bacillus thuringiensis var. israelensis, the organophosphate, temephos and the insect growth regulator, s-methoprene. While differences in response between lines were detected for some insecticides, no obvious or consistent effects related to presence of Wolbachia infection were observed. Spreading Wolbachia infections are, therefore, unlikely to affect the efficacy of traditional chemical control of mosquito outbreaks.


2005 ◽  
Vol 42 (5) ◽  
pp. 830-837 ◽  
Author(s):  
Ima Aparecida Braga ◽  
Cícero Brasileiro Mello ◽  
Isabela Reis Montella ◽  
José Bento Pereira Lima ◽  
Ademir De Jesus Martins Júnior ◽  
...  

1975 ◽  
Vol 5 (3) ◽  
pp. 233-241 ◽  
Author(s):  
Gary B. Quistad ◽  
Luana E. Staiger ◽  
David A. Schooley

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