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Journal of Integrative Agriculture  2023, Vol. 22 Issue (5): 1477-1488    DOI: 10.1016/j.jia.2022.08.081
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Photosensitivity and a precise combination of size-dependent lambda-cyhalothrin microcapsules synergistically generate better insecticidal efficacy 
GAO Yue1, 2, LUO Jian1, 2, SUN Yue1, 2, ZHANG Hua-wei3, ZHANG Da-xia1, 2, LIU Feng1, 2, MU Wei1, 2#, LI Bei-xing1, 2#

1 Key Laboratory of Pesticide Toxicology & Application Techniques, Shandong Agricultural University, Tai’an 271018, P.R.China

2 College of Plant Protection, Shandong Agricultural University, Tai’an 271018, P.R.China

3 Heilongjiang Forest Industry Agrochemical Co., Ltd., Harbin 150324, P.R.China

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本研究制备了不同粒径的聚脲高效氯氟氰菊酯微囊均有一定程度的塌陷,小粒径微囊塌陷更明显。它们的平均粒径分别为1.38 μm ( MC-S )5.13μm ( MC-M )10.05 μm ( MC-L ),囊壳厚度分别为39.650.3150.1 nm。小粒径微囊具有更快的释放性能;与MC-MMC-L相比,MC-S组对小地老虎的生物活性更高,对花生叶片的亲和力更好(由耐雨水冲刷可知);微囊均表现出随光照增强释放加快的趋势;与EC组相比,微囊降解都较慢,其中MC-L降解最慢。为了获得既具有速效性又具有持效期的微囊,将MC-S、MC-MMC-L2:11:11:2的比例两两混合花生叶面喷雾场景下,9个供试微囊组合中MC-S:MC-L1:2混合药效最好,持效期比乳油延长3倍。因此,不同粒径微囊精准组合可以调控农药的防治效果,为更好地利用农药提供策略。


In this study, lambda-cyhalothrin (LC) loaded polyurea microcapsules (MCs) with different particle sizes were fabricated.  All of the MCs showed varying degrees of physical collapse, which was more obvious among those with smaller particle sizes.  MCs with particle sizes of 1.38 μm (MC-S), 5.13 μm (MC-M) and 10.05 μm (MC-L) had shell thicknesses of 39.6, 50.3 and 150.1 nm, respectively.  MCs with smaller particles tended to have significantly faster release profiles, and the MC-S group had much higher bioactivity against Agrotis ipsilon and better foliar affinity on the peanut leaves (indicated by rainfastness) than MC-M and MC-L.  All of the MCs exhibited light-enhanced release profiles and had much slower degradation compared with the emulsifiable concentrate (EC) group, among which MC-L had the slowest degradation.  To generate MCs with both favorable quick efficacy and long-lasting efficacy, binary mixtures of MC-S, MC-M and MC-L were produced by mixing them in pairs at ratios of 2:1, 1:1 and 1:2.  The mixture of MC-S:MC-L at 1:2 showed the best comprehensive efficacy in the peanut foliar spray scenario among the nine tested combinations, and its effective duration was three times longer than that of EC.  Overall, the precise combination of MCs with different particle sizes can regulate the efficacy of pesticide control and serve as a strategy for the better utilization of pesticides.

Keywords:  polyurea microcapsules        size control        combination strategy        pest control        initial and long-term efficacy  
Received: 19 April 2022   Accepted: 29 June 2022

This research was funded by grants from the Modern Agricultural Industry Technology System for Vegetables in Shandong Province, China (SDAIT-05) and the National Natural Science Foundation of China (32001953).

About author:  GAO Yue, E-mail:; #Correspondence MU Wei, Tel: +86-538-8242611, E-mail:; LI Bei-xing, Tel: +86-538-8242611, E-mail:

Cite this article: 

GAO Yue, LUO Jian, SUN Yue, ZHANG Hua-wei, ZHANG Da-xia, LIU Feng, MU Wei, LI Bei-xing. 2023. Photosensitivity and a precise combination of size-dependent lambda-cyhalothrin microcapsules synergistically generate better insecticidal efficacy . Journal of Integrative Agriculture, 22(5): 1477-1488.

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