What problems are common on trees in Iowa?

Question:

What problems are common on trees in Iowa?

Answer:

While all trees have unique issues, some problems are more commonly encountered than others

Many issues seen in trees are due to improper environmental factors.  Even when insects or diseases are present, the primary cause may have been due to issues like overly wet soils, improper planting, or drought, among other things.  The pest or disease is secondary, moving in because the tree is weakened by poor environmental conditions.  

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The conditions listed below represent common problems observed on trees in Iowa.  When selecting trees to plant, consider these potential problems and avoid planting species or cultivars that are prone to them if these issues are present.

Common Issues Related to Poor Site Conditions and Environmental Stress

• Causes of Branch Dieback on Trees
• All About Stem Girdling Roots
• Winter Damage to Trees – including sunscald, desiccation, and rodent damage
• Frost and Freeze Damage
• Peeling and Splitting Bark
• Effects of Flooding on Trees and Shrubs
• Managing Storm-Damaged Trees (PDF)
• Construction Damage to Trees
• Grade Change Damage to Trees
• How to Manage Trees Near Sidewalks
• Pin Oak Chlorosis

Common Insect Problems on Trees

• Scale Insects
• Insect Galls
• Bagworm
• Carpenter Ants
• Emerald Ash Borer
• Japanese Beetle
• Eastern Tent Caterpillar

Common Disease Problems on Trees

• Anthracnose of Shade Trees
• Verticillium Wilt of Woody Plants
• Fungal Cankers of Trees (PDF)
• Oak Wilt
• Dutch Elm Disease
• Oak Tatters
• Apple Scab

Common Issues with Conifers

• Common Diseases of Conifers in Iowa (PDF)
• Pine Wilt (PDF)
• Browning of Conifer Needles
• Seasonal Needle Drop
• Rhizosphaera needle cast
• Stigmina Needle Cast
• Cytospora canker

Common Challenges with Wildlife

• Deer
• Rabbits