Nematicidal Activity of Three Limonoids from Dictamnus dasycarps against Bursaphelenchus xylophilus

Three limonoids, namely Fraxinellone, Obacunone, Evodin were isolated from bark of Dictamnus dasycarps and were identified. Experiments were conducted on their nematicidal activity against Bursaphelenchus xylophilus. The results showed that Fraxinellone, Obacunone, Evodin had inhibitory effect on B. xylophilus. The LC50 for B. xylophilus was as follows: 9.78 μg/mL, 15.99 μg/mL and 17.91 μg/mL.