From: IN%"VLINDERS@RCL.WAU.NL" "MEINDERT DE JONG :)" 2-NOV-1992 16:28:47.96
To: IN%"plantbio@daresbury.ac.uk"
CC: IN%"vlinders@RCL.WAU.NL"
Subj: Root Pressure, Wound Bleeding, Stump Sucking & Fungal Infection
Dear Planters:
In Canadian silviculture, stump sprouting of hardwoods can be
successfully controlled by a common wood invading fungus.
Mycelium of Chondrostereum purpureum can be pasted on freshly
cut stumps of alder, aspen, birch, maple to prevent sprouting.
I visited some biocontrol trials of the Pacific Forestry
Centre (B.C.) and noticed that the fungus is sometimes less
effective for unknown reasons. One explanation might be that
the root pressure and subsequent bleeding varies with the
seasons. The just cutted wound area could be less moisty by a
low seasonal fluctuating wood pressure. So my quests are:
1. Is there besides a daily fluctuating root pressure (maximal
at noon, minimal at midnight) also a seasonal fluctuating root
pressure?
The fungus is causing the well known silverleaf disease of
plums and cherries. Airborne spores of the fungus may enter
wounds of freshly pruned fruit trees. Fruit trees are yearly
pruned in autumn and winter. Due to sucking caused by an
underpressure of the wood, the spores can deeply penetrate
into the wood vessels.
2. Is this sucking of wood only occurring with pruned (comple-
te) fruit trees, or does it also happen with stubs of freshly
cut trees? In other words, can mycelium fragments of my bio-
control fungus be sucked up into the target trees?
* . /\ I'm intending to forward your
/\_ /~~\ * answers, comments to the PFC.
/ \/ \_ . I'm used to reply within a day.
/ \ __/
^ /\ \/ Best Regards|
/\ / \ /\ Meindert de Jong
/ \ ^ / \ /__\
____\ / \ || Vlinders@RCL.WAU.NL
!! / \ ^ Vlinders@HWALHW50
/__________\
^ ll ^ Voice: (+31) 8370 21937
^ ___/~~~~
~~\ /~~\ ^ / Fax: (+31) 8370 23110
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