Fungal Treatments

Treat Your Trees for Fungal Conditions

Fungal Foliar Diseases affect a wide variety of tree species. Fungal pathogens are unique to each species, so a proper diagnosis is vital. We’re trained at identifying tree diseases and recommending an effective treatment. Fungal diseases must be treated annually to ensure the long-term health of your trees.  We can help with:

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Apple Scab
Crabapple tree with Apple Scab

Apple Scab

Apple Scab
Apple Scab (Photo courtesy of Ohio State University)

What is Apple Scab?

Apple Scab is the most common disease of Crabapple trees in Minnesota and Wisconsin. This fungal disease first appears as small round, olive-colored lesions on the leaves. As the growing season continues, the lesions grow in size, turning the leaves yellow, then brown and black. Complete defoliation can occur. Several seasons of defoliation will stress the tree, making it susceptible to other pests.


What is the Treatment for Apple Scab?

Apple Scab is easily controlled. Treatment consists of two Spring foliar applications of fungicide. Timing of the application is critical, and must start when leaves begin to emerge in the Spring. Fungicides cannot cure infected leaves, but can protect new growth. 

Our Certified Arborists can evaluate your Crabapple, and determine if a fungicide treatment can protect your tree. 

Rhizosphaera Needle Cast

Rhizosphaera Needle Cast Damage
Rhizosphaera Needle Cast Damage (Photo courtesy of Joseph O'Brien, USDA Forest Service,

What is Rhizosphaera Needle Cast?

Rhizosphaera Needle Cast (or ‘Rhizo’) can affect most varieties of Spruce tree. It is especially problematic for Colorado Blue Spruce- which are not native to our area.

How Do I Know If My Tree is Infested with Rhizo?

Spruce trees infected with Rhizo will display brown or purple/brown needles starting near the ground. As the pathogen progresses, the discoloration will work its way up the canopy.

What is the Treatment for Rhizo?

Foliar fungicide treatments in late Spring and early Summer can protect new growth. The first treatment is applied right after bud-break. A second and third treatment take place in 2-3 week intervals. Foliar fungicide treatment is recommended annually to limit the spread of new growth. Once tissue is infected, our spray is not effective. Preventing new infection of the brand new buds is necessary to keep the pathogen suppressed. Rhizo can be accompanied by other infestations and fungal diseases, so accurate diagnosis is essential. Our Certified Arborists are skilled at determining what is wrong with your tree, and recommending appropriate treatments.  

Spread of the pathogen can be reduced by changing your tree care practices. Raise the canopy to allow ample air movement, remove infected leaf litter on the ground and space trees far enough apart to provide proper airflow. We recommend adjusting sprinklers to avoid spaying water on the needles, as this can spread the pathogen. 

Diplodia Shoot Blight

Diplodia Shoot Blight
Diplodia Shoot Blight (Photo Courtesy of Robert L Anderso, USDA Forest Service,

What is Diplodia Shoot Blight?

Diplodia Shoot Blight is caused by a fungal pathogen, and affects a variety of Pine trees. Most commonly affected in our area include Austrian Pine, Red Pine, Scots, and Jack Pine. 

The pathogen kills young, actively growing needles. Stressed trees are more vulnerable to the disease. To reduce the stress to your Pine trees, ensure that you are watering during warm, dry periods, protect the root zone and tree trunk from mower damage by installing a mulch ring, and prune to remove infected branches.

What is the Treatment for Diplodia? 

We recommend annual foliar suppression spays. This protects new growth and helps slow the spread of the pathogen. The first application is made right after bud-break, in early Spring. Follow-up applications are made in 2-3 week intervals. We can accurately diagnose your tree, make treatment recommendations, and suggest changes to ensure the pathogen has less-favorable conditions.

Why Use Expert Tree Service & Science?

What Sets Us Apart

Meet the Team

The Expert Tree Service Team
The Expert Tree Service Team

The entire team at Expert Tree Service & Science is passionate about providing exceptional tree care and customer service.

We have an amazing team made up of Certified Arborists, highly trained Ground Crew, Tree Climbers and Equipment Operators. Not to mention our incredible Office and Sales Staff. Interested in joining our team? Click here for to learn about Career Opportunities at Expert Tree.

Find out why we’ve been awarded the Angie’s List Super Service Award for over 10 years in a row!

Angie's List Super Service Award 2020