Magnolia scab disease - Knowledgebase Question

West Bend, WI (Zone 5A)
Question by rkomas7456
August 2, 2005
I have a magnolia tree and it has scab disease. I have sprayed it at least three times this year. Each times it seems I have less scab coming back. Also, this year it seems like it has attracted a lot of bees. What is your recommendation? Thank you

Answer from NGA
August 2, 2005


I'm not familiar with scab disease on Magnolias so I wonder if the problem with your tree was properly diagnosed. Magnolia may be subject to leaf spots caused by the bacterium Pseudomonas syringae or a large number of fungi. Leaf spots rarely require chemical controls. Rake up and dispose of infected leaves.

Canker diseases will kill branches. Cankers on branches can be pruned out. Keep trees healthy with regular fertilization and by watering in dry weather.

Verticillium wilt may cause death of a few branches or may kill the tree. Prune out dead branches and keep the tree healthy.

For a positive diagnosis of the problem, take a leaf sample to your local Cooperative Extension office. Helpful folks there can identify the problem and make control recommendations.

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