2种除草剂对凤眼莲生长的毒力动态与部位效应

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中图分类号：S451.21;S482.4;S481+.1 文献标志码：A 文章编号：1003-935X（2026）01-0076-08

Toxicity Dynamics and Site - Specific Effects of Two Herbicides on Growth of Pontederia crassipes

WU Wei，LIN Shuo，ZHAO Jianwei，YOU Yong （Institute of Plant Protection，Fujian Academy of Agricultural Sciences，Fuzhou 35OO13，China）

Abstract：Toevaluateeficacyofmultiple herbicidesagainstPontederiacrasipesandtoanalyzetheirsite-specificeffects anddynamic toxicitypatterns，eleven herbicides were initiallyscreened in2O24.The preliminaryresultsshowed that glufosinate-ammonium，bentazone，and flufenpyr-ethyl exhibited good bioactivity against P . crassipes ，causing moderate to severedamage.Basedonthese findings，bentazoneandflufenpyr-ethyl were selectedforfurther toxicityassessment. Leaf inhibitionrate，petioleinhibitionrate，newrotinhibitionrate，andfresh weightinhibitionratewere detemined to construct toxicity regression equation and to assess both site-specific effects and dynamic toxicity paterns.Flufenpyrethyl showed extremely high bioactivity.At7，14，and 28 days after application，the fresh weight GR 50 values were 0.017， 0.013，and O.011 mg/L for flufenpyr-ethyl，and 271.273，71.333，and 59.813mg/L for bentazone，respectively. Flufenpyr-ethyl caused uniform inhibition across all plant parts of P crassipes，with GR values below 0.019 mg/L for -50each part. Bentazone was most effective against the new root system of P .crassipes，with a GR value of 64.875 mg/L at 5028 days after application. In conclusion，both herbicides significantly inhibited growth of P . crassipes. Flufenpyr-ethyl demonstratedrapidandsystemicactivityatverylowconcentrations，indicating strong potential foreficient control. Key words：Pontederia crassipes ;bentazone;florpyrauxifen;herbicide; toxicity assessment

凤眼莲（PomtederiacrassipesMart.）因其具备快速的生长和繁殖能力，通过与本土植物竞争、堵塞水道和降低水质来破坏生态系统；还通过取代物种和扰乱营养循环来影响生物多样性，成为全球最具入侵性的水生杂草之一，对入侵地的生态环境和社会经济带来显著负面影响[1-2]。（剩余8836字）