Re: White Pine Blister Rust
- To: woodyplants@mallorn.com
- Subject: Re: White Pine Blister Rust
- From: L*@aol.com
- Date: Thu, 4 Feb 1999 01:23:27 EST
In a message dated 99-02-03 23:26:11 EST, you write:
<< Does anyone know of a species or cultivar that is resistant to
rust?
Or is there an acceptable distance between host and pine?
>>
Many species of Ribes are susceptible to white pine blister rust. Those that
are highly susceptible are R. ribicola, R. bracteosum, R. cynosbati, R.
inerme, R. nevadense, R. nigrum, R. petiolare, R. prostratum, R. roezli and R.
rotundifolium.
Males of Ribes alpinum are supposed to be resistant to rust diseases. I hope
someone else will be able to give you the names of other resistant varieties.
In terms of distance, source plants are usually within a few hundred meters of
pines, but depending on air patterns spores can travel up to several
kilometers.
White pine blister rust can be devastating, especially to young pines, so you
do need to be careful. I am assuming yours are eastern white pines and that
you live just outside the natural range, or just at the edge. The disease is
found throughout most of the range for white pines. However, it occurs most
and is most serious in northern and high-elevation areas and where average
July temperature is below 21C. That would not be the case in Southern
Illinois. You might want to call your extension service and see if it occurs
at all in your area.
If you do decide to plant Ribes, keeping your white pines limbed up so there
are no branches close to the ground, and planting the Ribes several hundred
meters from the white pines will help prevent the disease. I would guess in
your area if you took those precautions you would not have a problem with
white pine blister rust at all.
--Janis
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