Richard:
The rootstock shown in the photos is all MM106. I bud-grafted them
knee-high 38 years ago, and they were planted at variable depths. Jonagold
produced particularly large swellings at the graft union, as is evident in
photo #2. Photo #1 is Macoun/MM106.
The apple-crop server may still be having trouble getting mail to me.
I have seen your reply
and that of Brian Nelson, but not the one you reference from “Dave R”, whom I
am guessing is
Dr. Rosenberger.
I have not opened any of the affected trees to look for borer galleries
in the wood, but shot-holes can be seen entering bark and penetrating inward in
wood. Borer activity could account for the late appearance of weeping, which
can also appear in April and May on winter-injured trees without borers.
David K.
On Sep 11, 2015, at 9:41 AM, Richard J. Ossolinski <oss...@myfairpoint.net>
wrote:
> Sorry for your trouble, David, but pleased to hear Dave R.'s reply, as I
> think he identified issues typical to my trees as well, particularly:
>>
>> B. dothidea is commonly present in the dying outer bark of apple trees where
>> it seems to function primarily as a saprophyte or a weak pathogen. In trees
>> that are not drought stressed, it remains superficial although it appears to
>> contribute to the development of round patches of flakey bark (red oval
>> area) or circles where flakey bark has fallen (red circle), off as shown in
>> photo 1799 where I added the red markings. It can also cause warty growth
>> on small branches and/or black pustule-like structure such as those that I
>> think I am seeing on the right-hand side of the trunk in photo 1818.
>
> Am curious as to what rootstock you have under these trees.
> Thanks,
> Ozzie
>
> Richard J. Ossolinski
> 33 Sargeant Rd.
> Gouldsboro, ME 04607
> 207 963-4082
>
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>
>
>
>
>
> <100_8231.jpeg>
> On Sep 10, 2015, at 4:40 PM, David Kollas wrote:
>
>> I think this is winter injury (photos;4) but I am surprised that the
>> oozing did not show up much earlier. As well as I can recall, I did not
>> notice oozing
>> and staining of the bark when these trees were hand thinned in July. It is
>> more common on Jonagold than on Macoun and Melrose, and I have
>> seen little or none on Empire and other varieties. The trees were pruned
>> moderately-plus, in severity, mostly before the sub-zero (F.) temperatures
>> of January and February. The injury is not limited to any particular compass
>> direction of the tree, but it is more common on west than east.
>> I attribute the tiny, neat, round holes to opportunistic interloping
>> insects, rather than to something that might have introduced a disease.
>> But I am open to other ideas, and I wonder if others have seen similar
>> symptoms in the summer season.
>>
>> David Kollas
>> Kollas Orchard
>> Tolland, Connecticut, USA
>>
>>
>> <IMG_1799.jpeg> I <IMG_1800.jpeg><IMG_1818.jpeg><IMG_1815.jpeg>
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