North American Fruit Explorers mailing list at ibiblio

[Elizabeth Hilborn <ehilborn@mebtel.net>]

For the first time, this year I have a similar problem.

 I have had multiple pruning wound infections (black discoloration and 
no callus, dependent (proximal) to pruning cuts) this year - apple, pear 
and kiwi!  I don't know if it is the same thing as you describe.  I sent 
kiwi tissue samples to the plant pathologist. They were able to grow out 
fusarium (as I recall) but labelled it a probable saprophyte and 
probably not the cause of the initial lesion.

Betsy Hilborn



On 9/19/2011 6:43 PM, Richard MURPHY wrote:
> Guys;
>
> I've noticed on a few of my apple trees that there is some blackening near 
> the places where I did summer pruning the year before. It doesn't look like 
> fire blight. Is it sap / aphid stuff? The wounds all have new shoots coming 
> out in great health, and aside from the black color all appears fine. Is it 
> mildew?
>
> Murph
>
> R A Murphy Jr