(+)-Ledene is a terpene that has been found in T. vulgaris red oil.1 It induces the propagation of B. xylophilus nematodes in a cotton ball bioassay when applied at a concentration of 2 mg/cotton ball.
1.Kong, J.-O., Park, I.-K., Choi, K.-S., et al.Nematicidal and propagation activities of thyme red and white oil compounds toward Bursaphelenchus xylophilus (Nematoda: Parasitaphelenchidae)J. Nematol.39(3)237-242(2007)