| Autor: |
Webb, Garry, Miller, Peter, Peters, Bryce, Scrivener, Andrew, Webb, Cameron, Jovic, Vladan |
| Předmět: |
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| Zdroj: |
General & Applied Entomology; 2021, Vol. 49 Issue 1, p35-42, 8p |
| Abstrakt: |
The insect growth regulator pyriproxyfen in two formulations (Sumilarv 90 CS and Sumilarv 5 GR) was evaluated in semi-field trials for the control of immature stages of Culex quinquefasciatus Say. In the first trial, the two formulations were compared with the industry standard Prolink 50 CS (50g/L s-methoprene) at the field application rate for Prolink (ie. 11gai/ha or 3.7 ppb) in 50 L tubs. All three products produced 100% emergence inhibition of a single generation. In the second trial, Sumilarv 5 GR was evaluated in two-litre buckets over various nominal concentrations from 500ppb down to 0.5 ppb for five successive generations over 60 days. When applied as a granule, Sumilarv 5 GR produced 100% emergence inhibition across 5 generations. However, where serial dilutions of Sumilarv 5 GR treated water were tested, efficacy was greatly reduced. To investigate this phenomenon, the dilution process was repeated and samples analysed for pyriproxyfen content. The dilution process generated just 6 ppm (against the nominal 500 ppb) indicating that the granules were very stable in water and the pyriproxyfen was not readily released. Further, the pyriproxyfen content of water over 10 weeks following application of granules (nominal 500 ppb) showed an erratic but gradual release of active ingredient and a peak concentration of just 8.5 ppb at 1 week declining to below 1 ppb at 10 weeks. Pyriproxyfen was very effective in inhibiting emergence of Cx. quinquefasciatus adults for multiple generations at less than 10 ppb, and probably much lower. Sumilarv 5 GR when applied directly to water at 0.1g/L (nominal 500ppb) provided emergence inhibition for at least five generations over 60 days. These results demonstrate that these products hold great potential to assist the management of mosquitoes of pest and public health concern. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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