Dibotryon morbosum (Black Knot) on European plum trees
Posted: 02 Sep 2014, 22:31
Hello all,
I am new to this board today, so let me preface by saying I am not an experienced gardener but I do care for my charges. I am also a self-taught homeopath for over 21 years now.
We planted these two black plum trees here in Northern Vermont about 10 years ago. They were small and sparse and wispy when we got them and it took them at least 4 years to flower and fruit. That was in 2008. I know because I took pictures of the first plums. They were well-formed and very nice. Not a lot of them, but enough to be delighted by.
Due to late frosts and/or high winds, we had intermittent crops in the following years. Some scarce, one bountiful, others non-existent. Last year was the bountiful year. Huge amounts of plums (relatively, anyway)on both trees. Very nice. Very tasty. Then, after the harvest was over, I noticed the black fungus on a couple of the high branches in one of the trees. I couldn't reach them and made the mistake of putting off doing anything about them. I did prune the trees for the first time though, to allow them to "breathe" better. These trees stand side by side, about 20 feet apart, right outside our South-facing windows. Some of their branches touch a bit. Not much, but they do. This year, the fungus is on many of their branches, both of them. They are still putting out leaves and, other than the deformity of the fungus, they look healthy. No fruit this year. They did flower, but a windstorm got them before the bees did. However the flowers did not seem as vivacious either, as in other years.
I started feeding these trees some composted horse and goat manure in just the last 3 years or so. Before that, they just grew on their own mostly. The compost is from manure and organic hay that is fed to our two pet horses and two pet goats. They, in turn are fed organic hay and organic grain.
Does anybody have any ideas on how to approach this?
Thanking you all in advance,
Agi
I am new to this board today, so let me preface by saying I am not an experienced gardener but I do care for my charges. I am also a self-taught homeopath for over 21 years now.
We planted these two black plum trees here in Northern Vermont about 10 years ago. They were small and sparse and wispy when we got them and it took them at least 4 years to flower and fruit. That was in 2008. I know because I took pictures of the first plums. They were well-formed and very nice. Not a lot of them, but enough to be delighted by.
Due to late frosts and/or high winds, we had intermittent crops in the following years. Some scarce, one bountiful, others non-existent. Last year was the bountiful year. Huge amounts of plums (relatively, anyway)on both trees. Very nice. Very tasty. Then, after the harvest was over, I noticed the black fungus on a couple of the high branches in one of the trees. I couldn't reach them and made the mistake of putting off doing anything about them. I did prune the trees for the first time though, to allow them to "breathe" better. These trees stand side by side, about 20 feet apart, right outside our South-facing windows. Some of their branches touch a bit. Not much, but they do. This year, the fungus is on many of their branches, both of them. They are still putting out leaves and, other than the deformity of the fungus, they look healthy. No fruit this year. They did flower, but a windstorm got them before the bees did. However the flowers did not seem as vivacious either, as in other years.
I started feeding these trees some composted horse and goat manure in just the last 3 years or so. Before that, they just grew on their own mostly. The compost is from manure and organic hay that is fed to our two pet horses and two pet goats. They, in turn are fed organic hay and organic grain.
Does anybody have any ideas on how to approach this?
Thanking you all in advance,
Agi