Objective: This study was conducted to investigate the wetting behavior of different surfactant solutions on the leaf surfaces of apple during the fruit formation stage.
Methods: Five surfactants, including CE, Tween-20, Triton X-100, DTAB, and SDS were evaluated in this study. The contact angle, surface tension, adhesion tension, work of adhesion, and solid-liquid interface tension of droplets on the leaf surface were determined by the drop method.
Results: The results showed that the nonionic surfactants CE and Triton X-100 had better wetting effects than other surfactants. Moreover, when the concentration of CE and Triton X-100 was 1 × 10 mol/L, the leaves reached a completely wet state. Toxicity measurement showed that the incubation rate of Carposina niponensis eggs decreased gradually with increasing content of CE or Triton X-100. Additionally, field efficacy analysis showed that adding CE or Triton X-100 significantly improved the beta-cyfluthrin 3% water emulsion (EW) against C. niponensis.
Conclusions: These results indicate that the surfactants CE and Triton X-100 can significantly improve pesticide application, which will be helpful for reducing pesticide use and developing new pesticides.
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| http://dx.doi.org/10.1016/j.colsurfb.2019.110602 | DOI Listing |
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