Pine trees are susceptible to infestations of worm-like microorganisms called nematodes, which can cause serious economic damage to tree farms. Nematode infections have a wilting effect on the pines by interfering with the movement of water through the water-conducting tissues. Nematodes are transmitted by wood-boring bark beetles and can affect pines throughout the United States, Canada, Mexico, Japan, China, Taiwan and Korea. Since nematodes feed on growing, dying or dead trees, lumber, crates, wood chips, furniture, and any other pinewood products that are not kiln-dried can also transmit nematodes.