Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, Tai'an, P. R. China.
Jinan Tianbang Chemical Co., Ltd, Jinan, P. R. China.
Pest Manag Sci. 2021 May;77(5):2485-2493. doi: 10.1002/ps.6279. Epub 2021 Jan 28.
Often, due to the occurrence of powdery mildew, cucumber leaf surfaces is changed into a more hydrophobic surface, which affects wetting and spreading of liquid pesticides, reducing their efficiency. The wetting and deposition behavior of liquid pesticides can be improved by adding surfactants to pesticides. Added surfactants affect the spray volume of the pesticide, which can lead to waste and a low utilization rate of the pesticide. It is important to further balance the relationship between deposition and wettability of pesticide liquid on the surfaces of healthy leaves and powdery mildew leaves of cucumber.
This study evaluated the deposition and wettability of hexaconazole (Hexa) with surfactants on the surfaces of healthy leaves and powdery mildew leaves of cucumber. The deposition rates of Hexa with surfactants were lower than that of Hexa due to the loss of solution in conventional spray volume (750 L ha ). The deposition rate of Hexa did not necessarily increase with increasing spray volume, and the deposition rate did not increase again after the spray volume increased to a certain level. Under the condition that the prevention and control effect were not reduced, we found that the volume of solution spray with added Silwet618 or AEO-5 should be adjusted to half of the normal volume, while the volume of solution spray with added 1227 or rosin-based quarternary ammonium should be adjusted to two-thirds of the normal volume to increase the deposition rate by approximately 30%. Regarding the wetting parameters, the results showed that the wettability of Hexa with Silwet618 was the best, but their combination was not ideal according to the composite index and deposition. By analyzing all the parameters, it was found that the spray volume reduction of Hexa with surfactant was approximately equal to the solution surface tension reduction, compared with the parameters of Hexa.
The equilibrium relationship between deposition rate and wetting parameters was determined to provide guidance for the application of surfactants and to lower the dosage of pesticides to increase their efficiency and reduce their application. © 2021 Society of Chemical Industry.
由于白粉病的发生，黄瓜叶片表面通常会变成更疏水的表面，这会影响液体制剂的润湿和铺展，降低其效率。通过向农药中添加表面活性剂可以改善液体制剂的润湿和沉积行为。添加的表面活性剂会影响农药的喷雾量，从而导致浪费和农药利用率低。进一步平衡健康叶片和黄瓜白粉病叶片上农药液的沉积和润湿性之间的关系非常重要。
本研究评估了含有表面活性剂的己唑醇（Hexa）在健康的黄瓜叶片和白粉病叶片表面的沉积和润湿性。由于常规喷雾量（750 L ha -1 ）中溶液的损失，含表面活性剂的 Hexa 的沉积率低于 Hexa。Hexa 的沉积率不一定随喷雾量的增加而增加，并且在喷雾量增加到一定水平后沉积率不再增加。在不降低防治效果的情况下，我们发现添加 Silwet618 或 AEO-5 的溶液喷雾量应调整为正常体积的一半，而添加 1227 或松香基季铵盐的溶液喷雾量应调整为正常体积的三分之二，以将沉积率提高约 30%。关于润湿参数，结果表明，添加 Silwet618 的 Hexa 的润湿性最好，但根据复合指数和沉积，它们的组合不理想。通过分析所有参数，发现与 Hexa 的参数相比，含表面活性剂的 Hexa 的喷雾量减少量约等于溶液表面张力的降低量。
确定了沉积率和润湿参数之间的平衡关系，为表面活性剂的应用提供了指导，降低了农药的用量，提高了农药的效率，减少了其应用。 © 2021 化学工业协会。
