Tree Diseases: Oak Wilt
Introduction Oak wilt is an aggressive tree disease that affects many species of oak. The causal agent of oak wilt is the fungus Ceratocytis fagacearum. Ceratocytis fagacearum is believed to…
Insect Profiles: Fall Webworm (Hyphantria cunea)
Introduction Hyphantria cunea, also referred to as fall webworm, is a native insect of North America. Fall webworm passes through four stages during its life cycle, with the larval and…
Insect Profiles: Elongate Hemlock Scale (Fiorinia externa)
Introduction Fiorinia externa, also referred to as elongate hemlock scale or fiorina scale, is an insect native to Japan that infests eastern hemlock, northern Japanese hemlock, Carolina hemlock, fir, and…
Tree Diseases: Armillaria Root Rot
Introduction Armillaria root rot, also called fungal root rot, or Armillaria root disease, is a plant disease caused by several members of the genus Armillaria. The fungus most often identified…
Tree Care in Winter: Winter Injury on Evergreens
Introduction During the winter months, various cold-related injuries may be observed on evergreens. These cold-related injuries, also referred to as winter injuries, encompass a broad range of seasonal challenges. The…
Old Log Break Up Morsch Nature Injury Root Tree
Tree Care in Winter: Winter Injury on Hardwoods
Introduction In the tree care industry, winter injury is a general term that encompasses a slew of cold-related problems. Although more commonly observed on evergreens, winter injury can occur on…
Insect Profiles: Spring Cankerworm (Paleacrata vernata)
Introduction Paleacrata vernata, also referred to as spring cankerworm, is an insect native to North America that defoliates numerous deciduous trees and shrubs. Larvae appear from late April to early…
Winter Tree Injuries: Winter Browning of Conifers
Introduction In late winter and early spring, foliar browning is common on many coniferous plants. Arbovitae, hemlock, juniper, pine, spruce, yew, boxwood, and rhododendron are especially prone to this type…
Insect Profiles: Fall Cankerworm (Alsophila pometria)
Introduction Alsophila pometria, also referred to as fall cankerworm, is an insect native to North America. It is a member of the family of moths called Geometridae. Large populations of…
Tree Diseases: Crown Gall
Introduction Crown gall is a tree disease of many woody shrubs, and some herbaceous plants. The disease is caused by the bacterium Agrobacterium tumefaciens, a soil-borne bacterium that is normally…
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