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Cornell Cooperative Extension

Suffolk County

  • Agriculture
  • Family Health and Wellness
  • Gardening
  • Marine
  • Community Education
  • Suffolk County Farm
  • 4-H Youth
  • Peconic Dunes 4-H Camp
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


The Interactive Plant Manager: Diagnosing Pests of Woody Ornamental Plants

Anthracnose of Flowering Dogwood

Bark Splitting on Trees

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

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

USDA Forest Service Hazard Tree Publications and Leaflets

Contact

Alice Raimondo
Horticulture Consultant
aw242@cornell.edu
631-727-7850 x 335

Last updated February 20, 2020

Horticulture Factsheets

  • General Gardening Information
  • Sustainable Gardening
  • Vegetable Gardening
  • Vegetable Diseases
  • Vegetable Insects
  • Lawn Care
  • Lawn Pest Control
  • Tree / Shrub / Groundcover / Vine
  • Tree and Shrub Maintenance
  • Tree and Shrub Insect Pests
  • Tree and Shrub Disease
  • Flowers, Bulbs, and Ornamental Grasses
  • Small Fruit
  • Small Fruit Pests
  • Tree Fruit Growing
  • Tree Fruit Insect Pests
  • Tree Fruit Diseases
  • Indoor / Outdoor Insect Pests
  • Tick Biology and Control
  • Wildlife
  • Indoor Plant Care
  • Christmas Trees
  • Integrated Pest Management
  • Poisonous Plants
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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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Strengthening Families and Communities

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Promoting Sustainable Agriculture

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