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Dear All,
Sapsuckers have a way of recording favorite sap sources. They are=20
fond of vigorous Wire Birch grown on good loam but Alnus rugosa is=20
sometimes tapped with great intensity. I recently came across a dead=20
Alder with much old feeding panels and brought a short length home to be=20
examined. In some places the feeding panels are 15 mm wide, 5 mm high=20
with a horizontal partition of only 2 mm and vertical strips of=20
undamaged bark as narrow as 3 mm..
I don't see how phloem sap could move laterally at more than a very=20
slow rate so this panel pattern suggests that they start feeding high=20
and proceed downward.
A sample of a live Alder, which I brought home about 50 years ago, =20
has kept well and feeding intensity is relatively uniform but peters out=20
as smaller more scattered panels toward the lower end.
YT, DW, Kentville
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<body>Dear All,<div>=C2=A0 =C2=A0=C2=A0<span class=3D"Apple-tab-span" style=
=3D"white-space:pre"> </span>Sapsuckers have a way of recording favorite sa=
p sources. They are fond of vigorous Wire Birch grown on good loam but Alnu=
s rugosa is sometimes tapped with great intensity. I recently came across a =
dead Alder with much old feeding panels and brought a short length home to =
be examined. In some places the feeding panels are 15 mm wide, 5 mm high w=
ith a horizontal partition of only 2 mm and vertical strips of undamaged ba=
rk as narrow as 3 mm.. =C2=A0=C2=A0</div><div>=C2=A0 =C2=A0 I don't see how =
phloem sap could move laterally at more than a very slow rate so this pane=
l pattern suggests that they start feeding high and proceed downward.</div>=
<div>=C2=A0 =C2=A0 A sample of a live Alder, which I brought home about 50=
years ago, =C2=A0has kept well and feeding intensity is relatively uniform=
but peters out as smaller more scattered panels toward the lower end.</div>=
<div>=C2=A0 =C2=A0 YT, DW, Kentville</div></body></html>
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