Aim: To reduce the contamination arising from abuse of commercial pesticide formulations, the coaxial electrospray (CES) method was used for one-step microencapsulation and spraying of pesticides.

Methods: After optimisation of process parameters, polymeric microcapsules with different structures were fabricated as the carriers of azoxystrobin (AZS). For the resultant microcapsules, the sustained pesticide release was verified in vitro and the adhesion properties were investigated through a normalised rinsing test.

Results: The maximum encapsulation efficiency of the fabricated AZS-loaded microcapsules was 99.14%. Compared to commercial AZS aqueous suspension, the microcapsules fabricated by the CES method exhibited improved sustained release performance of AZS, which could be readily controlled by adjusting the shell thicknesses. Moreover, highly enhanced adhesion performance was observed for the AZS-loaded microcapsules directly sprayed in CES process.

Conclusions: The CES process is promising to be applied as a one-step microencapsulation and spraying technology for improving pesticide utilisation and reducing environmental pollution.

目的：为了减少由于滥用商业农药制剂而引起的污染，同轴电喷雾（CES）方法用于农药的一步微囊化和喷涂。

方法：在优化工艺参数后，将具有不同结构的聚合物微囊作为嘧菌酯（AZS）的载体。对于所得的微胶囊，在体外验证了农药的持续释放，并通过归一化漂洗试验研究了其粘附特性。

结果：制备的载有AZS的微胶囊的最大包封效率为99.14％。与市售的AZS水性悬浮液相比，通过CES方法制备的微胶囊具有改善的AZS缓释性能，可以通过调节壳厚度轻松控制。此外，对于在CES过程中直接喷涂的装有AZS的微胶囊，观察到了高度增强的粘合性能。

结论： CES工艺有望被用作一步法微囊化和喷涂技术，以提高农药利用率并减少环境污染。