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USDA Forest Service

USDA Forest Service

The U.S. Department of Agriculture Forest Service is a Federal agency that manages public lands in national forests and grasslands. The Forest Service is also the largest forestry research organization in the world, and provides technical and financial assistance to state and private forestry agencies. Gifford Pinchot, the first Chief of the Forest Service, summed up the purpose of the Forest Service—"to provide the greatest amount of good for the greatest amount of people in the long run."
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Image Subject Name Scientific Name Description
4387002 pine wilt nematode Bursaphelenchus xylophilus In Japan and other Asian countries, the nematode causes pine wilt. The slide shows a dying pine in Japan.
4387003 pine wilt nematode Bursaphelenchus xylophilus Showing head under microscope
4387004 pine wilt nematode Bursaphelenchus xylophilus Gravid female
4387005 pine wilt nematode Bursaphelenchus xylophilus Tale of male showing characteristic spicule.
4387006 pine wilt nematode Bursaphelenchus xylophilus The nematode is vectored by species of Monochamus (a.k.a. sawyers or longhorned beetles).
4387007 pine wilt nematode Bursaphelenchus xylophilus The dauerlarvae (transmission stage) of the nematode invade the callow adult through the thoracic spiracles and are held in quiescent state only in the tracheae.
4387008 pine wilt nematode Bursaphelenchus xylophilus The nematode may be transmitted to a susceptible host when the adult feed on pine shoots. This is termed "primary transmission" and may result in pine wilt.
4387009 pine wilt nematode Bursaphelenchus xylophilus The most common mode of transmission of the nematode, however, is when the adult female sawyer ovipositions in recently felled logs and dead or dying conifers, particularly pines. This is secondary transmission and the nematode is a secondary associate. Slide shows oviposition pits made in bark by sawyer.
4387010 pine wilt nematode Bursaphelenchus xylophilus As a secondary associate, the nematode is mycophagous and feeds on the fungi in the wood, including bluestain fungi transmitted by engraver and other bark beetles.

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