Apex Tree Service Ltd. | A Comprehensive Guide to Insects and Diseases Affecting Trees in Calgary, Alberta

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By Apex Tree Service Ltd.

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Introduction:

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Calgary's urban forest is invaluable, enhancing our environment and community. However, these trees are vulnerable to various insects and diseases, which can compromise their health and beauty. At Apex Tree we aim to equip you with the knowledge to identify, manage, and prevent these threats. Here's an in-depth look at the common pests and diseases you might encounter in Calgary's trees:

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Common Insects Affecting Trees in Calgary:

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1. Aphids:
   These tiny insects feed on sap from trees like maples and birches, leading to distorted leaves and a sticky substance called honeydew, which promotes sooty mold.
2. Elm Scale:
   Affects elm trees by feeding on leaves and branches, producing honeydew. Heavy infestations can debilitate trees, especially during hot summers.
3. Oystershell Scale:
   Targets cotoneaster, ash, and fruit trees, creating a protective shell while feeding on plant sap, which can lead to branch dieback.
4. Ash Leaf Cone Roller:
   Causes ash leaves to roll into cones, where larvae feed, leading to defoliation. Though not native, it's becoming more prevalent.
5. Yellow-Headed Spruce Sawfly:
   Larvae consume spruce needles, which can defoliate trees if not controlled, particularly affecting younger trees.
6. Satin Moth:
   Known for defoliating poplar trees, they can cause significant stress if populations surge.
7. Spruce Gall Adelgid:
   Promotes gall formation on spruce branches, which can disrupt tree growth if widespread.
8. Bronze Birch Borer:
   A beetle that bores into birch trees, often targeting those already under stress, can lead to tree death.

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Common Tree Diseases in Calgary:

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1. Black Knot Fungus:
   Affects cherries, plums, and other Prunus species with dark, hard knots on branches. Requires timely pruning for control.
2. Fire Blight:
   A bacterial disease impacting members of the rose family like apple and hawthorn, causing wilting and blackening of shoots.
3. Bronze Leaf Disease:
   Specifically affects poplars and aspens, turning leaves bronze before they fall, leading to tree decline over time.
4. Dutch Elm Disease (DED):
   Although not currently in Alberta, vigilance is necessary. Symptoms include wilting leaves and branches; early detection is vital.
5. Cytospora Canker:
   Affects spruces with signs of resinous exudation and branch dieback. Management involves removing infected branches.
6. Rhizosphaera Needle Cast:
   Fungal disease on spruces causing needle drop, which can severely impact tree health if untreated.

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Prevention and Management Strategies:

‍Routine Inspections: Regular checks can catch problems early.

Pruning: Correct pruning techniques during the right seasons can limit disease spread.

Tree Care: Ensuring trees are healthy through proper watering, fertilization, and mulching boosts their resistance.

Pesticides and Fungicides: Use when necessary, but always with professional guidance to minimize environmental impact.

Biological Control: Encouraging natural predators or using biological controls can manage pest populations.

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Professional Assistance from Apex Tree:

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At Apex , our arborists are equipped with the expertise to diagnose and treat these issues:

‍Comprehensive Health Assessments: We'll identify what's affecting your trees.

Customized Treatment Plans: From insect control to disease management, we tailor our approach.

Preventive Advice: We provide ongoing guidance to maintain tree health against future threats.

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Conclusion:Protecting Calgary's trees from insects and diseases is a shared responsibility. With the right knowledge and action, we can ensure our urban forest remains thriving. If you suspect your trees might be suffering, don't hesitate to contact Apex Tree Service Ltd. for professional assistance.

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For further information or to schedule a tree health consultation, visit www.apextree.ca or call us at (587) 968-8733

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