What's going on with this Japanese Maple?
- Thread starter keithl
- Start date
Ozz80
Yamadori
As far as I know, interveinal chlorosis on old leaves is related to plant's inability to supply magnesium or manganese to it's leaves. It can be due to,
- Deficiency of these elements in the soil.
- Overwatering,
- Damage in the root system due to diseases or excess salinity, or over feeding etc.
- Excess of elements such as potassium in the soil that inhibit Mg or Mn intake,
- Low ph of the soil
What type of soil is it planted in?
Iron deficiency due to high pH meanwhile shows itself firstly at new leaves.
- Deficiency of these elements in the soil.
- Overwatering,
- Damage in the root system due to diseases or excess salinity, or over feeding etc.
- Excess of elements such as potassium in the soil that inhibit Mg or Mn intake,
- Low ph of the soil
What type of soil is it planted in?
Iron deficiency due to high pH meanwhile shows itself firstly at new leaves.
It's in bonsai jack soil. Have about 10 or so Japanese maples all in the same soil, same fertilizer, same watering, same everything. Only this one is showing this issue. Maybe it's just the first with a problem and the others will start though. I normally don't use slow release fertilizer, but maybe it's not releasing?
Makes me wonder if it's a disease. I did have an issue with Pseudomonas on an ume I bought. Hopefully that didn't spread here, but I don't think chlorosis is a symptom of that?
Makes me wonder if it's a disease. I did have an issue with Pseudomonas on an ume I bought. Hopefully that didn't spread here, but I don't think chlorosis is a symptom of that?
Ozz80
Yamadori
A possible temporary solution can be carefully feeding the tree with mineral nutrients in foliar spray form. I suggest applying it early morning with a light dose while keeping the plant in shade later to avoid sun burns. Maybe you can try it at a small part of the foliage first and see if it works without causing any damage.
I have no experience with Pseudomonas, so I can't say whether it may be the culprit or not, although a disease effecting roots come to my mind as well since you have explained that the tree is in a well draining soil with slow release fertilizers. (also assuming that it is not overwatered).
I am not sure that at this moment a drastic action is required though. If foliar feeding does not solve the problem and chlorosis continues stable without further damage on leaves, you may consider checking the root system for signs of a problem at next spring.
If things start to get worse however (necrosis on leaves), I would suggest you to ask again in this forum about what can be done.
I have no experience with Pseudomonas, so I can't say whether it may be the culprit or not, although a disease effecting roots come to my mind as well since you have explained that the tree is in a well draining soil with slow release fertilizers. (also assuming that it is not overwatered).
I am not sure that at this moment a drastic action is required though. If foliar feeding does not solve the problem and chlorosis continues stable without further damage on leaves, you may consider checking the root system for signs of a problem at next spring.
If things start to get worse however (necrosis on leaves), I would suggest you to ask again in this forum about what can be done.
