Root Collar Weavel???
dvank at michweb.net
Fri Mar 26 18:51:59 EST 1999
Norman Hall-Gardiner wrote:
> DVK wrote in message <36FA8013.F28D31AD at michweb.net>...
> >A few of my Red Pines (aka Norway Pines aka Pinus resinosa Aiton) have
> >succombed to what I think is a root collar weavel (I think that I've
> >heard of these creatures before, but I may be mistaken). Anyway, the
> >trees broke off smooth and rounded where the stump meets the soil with a
> >little assistance from the wind. Dried up sap cakes the earth where
> >this junction was. Only one Jack Pine appears similarly effected. I
> >have not seen any evidence of similar damage to my White Pines.
> >Question: What the hell is happening -- is there really a root collar
> >weavel? Will they spread to more trees? Are only unhealthy trees
> >sussesptable to this pest? How do I eradicate or prevent the spread?
> When I first read this I thought ' Easy - Large pine weevil (Hylobius
> abietinum).' They breed in the cut stumps of previous crops, and then the
> adults chew away at the bark of the new crop, usually at ground level. The
> tree dies if it is girdled. We often plant trees that have been dipped in a
> formulation of Gamma HCH, which will last for the first year, and may follow
> up with a spray in subsequent years if there is a need.
> But I have never heard of it attacking 23 year-old trees. I would suspect
> larger, warm-blooded creatures that have chewed the bark, allowing fungal
> attack to the exposed wood, which in turn has rotted the timber, leading to
> windblow. Perhaps voles?
Nope. The affected area is below the soil line -- no tooth marks. This is a
"first time" plantation since the land was cleared back in the late 1800s.
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