Abstract
Fluopyram, an excellent nematicide, has better water solubility than abamectin; this feature is important for its systemic transport in trees as a trunk-injection agent. To identify the potential of fluopyram as a trunk-injection agent against Bursaphelenchus xylophilus, its toxicity to different developmental stages and effects on the egg hatching and reproduction of B. xylophilus were studied. Fluopyram exhibited significant nematicidal activity similar to that of abamectin, with LC50 values of 0.945, 1.69 and 3.23 mg L− 1 for second-stage juveniles (J2), third-stage juveniles (J3) and fourth-stage juveniles/adults (J4/adults), respectively. The hatching rate at a fluopyram concentration of 3 mg L− 1 was 20.78%, significantly lower than that in the control group (90.48%) at 24 h. In addition, the reproduction of B. xylophilus at a concentration of 2.21 mg L− 1 decreased significantly, similar to the effect of abamectin at 1.42 mg L− 1. In a hydroponic experiment, fluopyram treatment decreased the number of B. xylophilus at a concentration of 64 mg L− 1. Fluopyram exhibited a greater inhibitory effect than abamectin. Overall, fluopyram has significant nematicidal activity against B. xylophilus and shows potential to be a new trunk-injection agent.
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Acknowledgements
The study was supported by the National Key R and D Program of China (2017YFD0600102). The authors thank Prof. Zhenyu Liu for providing the Botrytis cinerea and B. xylophilus cultures.
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Liu, G., Lin, X., Xu, S. et al. Efficacy of fluopyram as a candidate trunk-injection agent against Bursaphelenchus xylophilus. Eur J Plant Pathol 157, 403–411 (2020). https://doi.org/10.1007/s10658-020-02023-8
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DOI: https://doi.org/10.1007/s10658-020-02023-8