Question about cotoneaster bonsai tree

[AncaCh]

Hi all,

Could you please give me some advice?
Over the last few months my contoneaster bonsai tree has been loosing leaves. They initially turn yellow and then brown. Initially I thought it was deciduous bonsai, but now I am not so sure.

If you have a closer look there are some white spots on the trunk and on the leaves.

What should I do?

Thank you.

Anca

 

[Wires_Guy_wires]

I would investigate the white bumps, they look like scale.
It could be shedding old leaves, which is natural.

I don't really see any signs of bad health in the pictures, but I never had a cotoneaster so I'm not sure.

 

[penumbra]

All cotoneaster are partially deciduous to fully so in my climate, but since I don't know where you are, there is no point of comparison.
As stated above, it does look like you have a little scale but it doesn't look like enough to cause leaf drop to any serious degree. In your case I think a spray of horticultural oil would be enough to control them at the present stage. For a serious infestation I use systemics.
As to your question "what should I do?" , you should add your location to your profile so we can be more specific in our advice.
And welcome..............
stay awhile

 

[Shibui]

Definitely need to know where in the world you are to give best advice.
As already mentioned, even evergreen leaves only have a lifespan of 2-3 years then die and drop. Meanwhile new leaves have developed at the ends of the shoots to take over photosynthesis. If the dying leaves are all further back on the branches and newer, outer leaves are healthy there's no problem but if newer, outer leaves are affected that's different and needs to be addressed.

Looks like your branches are getting a little long. Keeping a bonsai in good shape requires regular pruning to maintain shape and size.
Fertilizer is also important. Trees in small pots can starve to death if we fail to provide essential nutrients.

 

[Potawatomi13]

you should add your location to your profile so we can be more specific in our advice.
And welcome..............

Hear, Hear.