Two invasive species of Ambrosia beetles very active in Maryland this season. These two non-native invasive species of ambrosia beetles are Xylosandrus germanus and Xylosandrus crassiusculus. Over the last 2 weeks the Univeristy of Maryland has received samples from nursery owners and landscape managers with damage from the ambrosia beetle, Xylosandrus germanus and Xylosandrus crassiusculus. We have recorded this beetle damaging honeylocust (Gledistia triacanthos), London plane tree, Zelkova, river birch, American holly (Ilex opaca), sweet bay magnolia (Magnolia virginiana), Chinese dogwood (Cornus kousa), yellowwood, and Styrax. A fruit orchard that is also a fruit nursery supplier sent in samples of Oriental persimmon, Asian pears, English walnut and chestnuts that were infested with Xylosandrus germanus. They lost all of their grafted 1 year old trees to an infestation of X.germanus.
Xylosandrus crassiusculus adult ambrosia beetle. Photo by J.R. Baker & S.B. Bambara, North Carolina State University, Bugwood.org.
Eggs and larvae of ambrosia beetle in wood. Photo by Will Hudson, University of Georgia, Bugwood.org.
Frass expelled in long "toothpick" from ambrosia beetle. Photo by J.R. Baker & S.B. Bambara, North Carolina State University, Bugwood.org.
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