Common Tree Diseases

Apple Scab, Anthracnose, and lethal yellow of palm, – if you’re into gardening, you might be familiar with these names. Among their symptoms are dying flowers and branches and, worse case, death of an entire tree.

These are just some of the few diseases that could be growing your trees and plants and could be harming them and your entire backyard. We will also discuss on how you can control these tree damaging diseases.

Apple scabapplescab-leaf

Apple scab is an early season leaf disease affecting crabapples. Some crabapple cultivars are more resistant than others. What happens is premature defoliation that is caused by lesions on the leaves.

Control: While mostly aesthetic, homeowners may find apple scab objectionable. Manage it with fungicide applications which have ingredients, such as fenarimol, beginning at bud break.


Powdery mildewpowdery_mildew2_by_pollinator-wikimedia_commons

Powdery mildew forms a white coating on leaf surfaces during dry weather accompanied by high humidity in plants that grow in shaded areas. It is caused by any one of several fungi.

When planting new trees and shrubs, choose resistant varieties. Some groups of highly susceptible plants, such as crape myrtles, crabapples, and lilacs, have cultivars selected for resistance to powdery mildew. Several fungicides are available that will control this mildew.


Cedar rustscedarapple_rust169

Cedar rusts are common foliar diseases of rosaceous plants, such as hawthorn and crab-apple. Just like apple scab, there are species which are more susceptible than others. Rust diseases require junipers as an alternate host. Rust-colored leaf spots form on hawthorn and crab-apples in the spring.

Control: The disease can be managed with fungicide applications on the  hosts beginning at bud break or when orange spore masses develop on junipers. Triadimefon is the ingredient which is responsible in dealing with rust diseases. Do your best to prune out rust galls on junipers when you see them.

Leaf spotleaf-spot

Leaf spot is a fungi that causes red spots that rot holes in foliage. It spreads rapidly during cool, wet spring weather, when new foliage is developing. Leaf spots commonly occur with ornamental cherry trees.


Simply shake infected leaves from the tree onto a disposable sheet or tarp and destroy. Prune the tree to encourage better air circulation and mulch well to prevent the fungi form splashing up from the ground.


Many tree services website usually do not offer to help you deal with these things and it can be annoying to deal with especially when attempting an aesthetically beautiful garden. For concerns such this, contact Assurance Trees today and we will help you sort it out in no time!


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