Bumps/lumps appearing on my Silver Birch tree

Question From: 
Matt Jackson in  Point Cook ,  Melbourne VIC


Nature of problem: 
Bumps/lumps appearing on my Silver Birch tree


Type of Plant (if known): 
Silver Birch


Symptoms of Plant Illness (please try NOT to diagnose your problems yourself): 
Bbumps/lumps appearing on the trunk of the tree leading up & out to the branches. Some leaf drop. Scratch away lump it has a whitish centre


Soil Type (e.g. sandy, clay or loam) OR Potting Mix Type: 
Predominantly clay soil. when tree was planted soil was improved.


How often do you water the plant:
Only when it rains


How many hours of sunlight does the plant get each day:
8 hrs. Planted on the northern aspect.


What type of plant is it:
Silver birch


How long since you planted it:


Have you fertilised? If so, with what and when:
Twice yearly. Scotts osmocote “Landscape formula all purpose wirh trace elements”


Is the plant indoors or outdoors: 
out doors


What other treatments have you given the plant: 

Upload photo if available: 

Other Comments: 
Hi Don, you answer my question last week but only the photo of the beetle was uploaded. I’m resending my question with a photo of the bumps/lumps on my silver birch tree so you can better understand what is appearing on my tree. I’ve scratched away one of the lumps and there appears to be a whitish centre (can only upload one photo). The tree is situated in a meter wide garden bed with another silver birch beside it. This silver birch is every healthy with new growth and no signs of bumps/lumps on the trunk.


Answer:  Thanks for the extra photo Matt. That confirms my view from last week. Bacterial infections due to poor growing conditions. Remember that this a lottery: with poor conditions. perhaps less than 50% of trees will get sick.  Don