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Cornell Cooperative Extension

Suffolk County

  • Agriculture
  • Community Education
  • Gardening
  • Horticulture Labs
  • Marine
  • Energy
  • County Farm
  • 4-H
  • Peconic Dunes
  • Recursos en Español
Typical cedar-apple rust gall found in moist spring weather on juniper host.
Image by Thomas Kowalsick, CCE Suffolk

Typical cedar-apple rust gall found in moist spring weather on juniper host.

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  • Tree and Shrub Disease
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Tree and Shrub Disease


Alternatives to Boxwood

Anthracnose of Flowering Dogwood

Bark Splitting on Trees

Beech Leaf Disease

Boxwood Blight

Boxwood Blight Frequently Asked Questions

Cankers on Trees

Cenagium Canker of Pines

Cytospora Cankers

Diagnosing Rhododendron Problems

Diplodia Tip Blight on Pines

Gymnosporangium Rust the Three Common Cedar Rust Diseases

Juniper Tip Blight

Laurel Wilt in New York

Leaf Scorch

Maple Decline

Normal Needle and Foliage Shedding on Evergreens

Oak Leaf Blister

Oak Wilt NY State DEC

Oak Wilt Protective Zone NY State DEC

Oak Wilt Risk: Distinguishing between Red and White Oaks

Pachysandra Leaf Blight

Sooty Mold

Tree Dwelling Lichens

Verticillium Wilt

Winter Injury

Why Flowering Shrubs Fail to Bloom

How to Recognize Hazardous Defects in Trees

Contact

Alice Raimondo
Horticulture Consultant
aw242@cornell.edu
631-727-4126

Last updated November 26, 2025

Horticulture Factsheets

  • General Gardening Information
  • Vegetable Gardening
  • Lawn Care
  • Ornamentals: Trees, Shrubs, Herbaceous
  • Growing Fruit
  • Indoor / Outdoor Insect Pests, Wildlide & Poisonous Plants
  • Christmas Trees
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Cornell Cooperative Extension
Suffolk County

Extension Education Center
423 Griffing Avenue, Suite 100
Riverhead, New York 11901-3071
TEL: 631-727-7850
suffolk@cornell.edu
Hours: 8:30am-4:30pm

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