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virsus and multigrafting
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Posted by fruitnut z7,4500ft SW TX (My Page) on Tue, Nov 17, 09 at 18:44
| I've become aware that most of my fruit trees and grapes are virus infected. The grapes I've been aware of for sometime. They have leaf roll virus. On varieties like Summer Royal with highly pigmented fruit, the leaves begin to show dark coloration on the margins in mid summer. The coloration increases later in the season. This virus is widespread in places like WA state where an estimated 1/3 may be infected. It can cause decline in yield and quality. My fruit is still very high quality and the yield is high. I also thinned off much of the crop because I left quite a few canes.
Much of my stone fruit is infected with an unknown virus or I think it is. The leaf margins bleach out after mid season esp on multigrafted trees. A few ungrafted trees have unaffected leaves. It looks somewhat like a nutrient deficiency. Mainly it shows up on the plums, pluots, sweet cherries, and nectarines. I don't recall seeing any on apricots. Again my fruit is large and high quality. All this is in my greenhouse. I've seen symptoms on sweet cherries outside that I think are virus.
I think I've spread this some by intergrafting for pollination. So even though I can't see much damage, I'm not intergrafting much from now on.
The Fruitnut |
Follow-Up Postings:
RE: virsus and multigrafting
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- Posted by myk1 5 IL (My Page) on
Tue, Nov 17, 09 at 19:24
| I've worried about this trying to get a cutting from my niece's guessed Newtown Pippin. It might just be coincidence that an extremely wet year happened the year after I got a bushel of apples from her and the scraps ended up in the compost pile, but I never had flyspeck and some kind of black mildew until this year. I would hate to introduce fire blight, which I had in a pear a long time ago but I don't think I've ever had in my apples. |
RE: virsus and multigrafting
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| I believe the green house environment protects against weather but allows build up of certain pathogens. My mother worked in a green house for 15 years. There were some seasonal plants that would always get sick. Leaf margin bleach out could be wet feet. Re pot with better drainage holes. |
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