Clicio
Masterpiece
After some research, I think this is the disease that is making the low needles of my cascade cork bark JBP fall down.
It's been a hot and very humid summer here, and the tree is getting its fair amount of rain showers every day. Other JBP I have nearby seem not affected by the same symptoms, and look healthy.
So, the diagnosis seems to be:
"Dothistroma needle blight is a fungal disease that turns needles brown and results in early needle drop. Needle loss slows tree growth and severe infection several years in a row can result in tree death."
Below is a picture to help your confirmation, and some more info.
The questions are:
Is Daconil effective against this problem?
What else should I do besides following the advice below?
It's been a hot and very humid summer here, and the tree is getting its fair amount of rain showers every day. Other JBP I have nearby seem not affected by the same symptoms, and look healthy.
So, the diagnosis seems to be:
"Dothistroma needle blight is a fungal disease that turns needles brown and results in early needle drop. Needle loss slows tree growth and severe infection several years in a row can result in tree death."
Below is a picture to help your confirmation, and some more info.
The questions are:
Is Daconil effective against this problem?
What else should I do besides following the advice below?
- Do not overcrowd plants.
- Remove bottom most branches from trunk to help increase circulation around the tree canopy.
- Control weeds under the trees with wood mulch.
- Maintain a layer of mulch around your tree. Do not mound the mulch around the trunk of the tree but lay a flat layer.
- Make sure that water is not spraying the needles.
- If the disease does occur, a copper fungicide can be applied once just before buds open in the spring (typically in mid-May) to protect needles from previous years and once after new needles have grown to their full length (in early to mid summer).