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Japanese Pine Sawyer Beetle

Monochamus alternatus (Hope)
Small White-Marmorated Longhorned Beetle Small White-Marmorated Longhorned Beetle
C.M.F. Pierce



Seventeen species of Pinus, including Japanese red pine, Japanese black pine, luchu pine, and Mason pine, three species of spruce and one species each of fir; true cedar, and larch have been reported as hosts of the Japanese pine sawyer beetle.


Commodities Affected:
Forestry and Natural Areas, Nursery, Ornamentals, and Turf



Several species of conifer infesting Monochamus (e.g. M. caroliniensis, M. marmorator, M. notatus, M. titillator, M. scutellatus) are indigenous to North America. All are woodborers in recently killed or severely stressed trees. If introduced and established in North America, the Japanese pine sawyer beetle is expected to cause the same type of injury that is already being caused by these indigenous species of Monochamus.


The Japanese pine sawyer beetle is a vector of the pinewood nematode, Bursaphelenchus xylophilus, a pathogen native to North America. Since native North American conifers are not damaged by the pinewood nematode and several North American species of Monochamus have already been determined to be vectors of this pathogen, little economic damage is expected from the introduction and establishment of another species of Monochamus. However, should an introduction of Japanese pine sawyer beetle be accompanied by an introduction of one or more species of Bursaphelenchus indigenous to Asia, and should these nematodes be pathogenic to North American conifers, the resultant impact could be severe.



The Japanese pine sawyer beetle is not known to occur in Indiana.