NOTES ON TWO BORERS INJURIOUS TO THE MOUNTAIN ASH
In the late publication of the Department of Agriculture on “Foresttree Imsects” three species are mentioned as affecting the trunk of Pyrus americana, viz: The round and flat-headed apple-tree borers and an unknown longicorn larva. I have recently found two additional species fully as injurious as those mentioned. These are Podosesia syringœ and Zeuzophora semifuneralis.
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1939 ◽
Vol 23
(254)
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pp. 225-226
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1879 ◽
Vol 7
(167supp)
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pp. 2651-2651
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2020 ◽
Vol 80
(4)
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pp. 415-434
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2016 ◽