Plant Disorders: Leaf Scorch
Introduction Leaf scorch is a physiological disorder of plants. It can affect most plants if the weather conditions are favorable. Extreme temperatures, heavy winds, periods…
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Insect Profiles: Elm Leaf Beetle (Xanthogaleruca luteola)
Introduction Elm leaf beetle (Xanthogaleruca luteola) is a significant nuisance of elm trees. It is a member of the family Chrysomelidae. Elm leaf beetle is…
Tree Diseases: Black Spot of Rose
Introduction Black spot of rose is one of the most widespread plant diseases around the world. The disease is caused by the fungus Diplocarpon rosae.…
Tree Diseases: Black Rot of Apple Trees
Introduction Black rot of apple, also called frogeye leaf spot, is a fungal disease that infects the fruit, leaves, and bark of various hardwood trees,…
Insect Profiles: Aphids
Introduction Aphids, also known as plant lice, blackflies, or greenflies, and sometimes erroneously referred to as whiteflies, are small, soft-bodied insects that feed on the…
Insect Profiles: Forest Tent Caterpillar (Malacosoma disstria)
Introduction Forest tent caterpillar (Malacosoma disstria) is a significant defoliator of various trees and shrubs. It is indigenous to North America. Outbreaks of forest tent…
Insect Profiles: Eastern Tent Caterpillar (Malacosoma americanum)
Introduction Eastern tent caterpillar (Malacosoma americanum) is a species of moth that is native to North America. The insect was first observed in the United…
Tree Diseases: Pine Needle Scale (Chionaspis pinifoliae)
Introduction Pine needle scale (Chionaspis pinifoliae), also referred to as white scale, is a tiny armored insect that infests various species of pine. The insect…
Tree Diseases: White Pine Blister Rust
Introduction White pine blister rust is a fungal disease of white pine. It is caused by the fungus, Cronartium ribicola. The disease pathogen is native…
Tree Diseases: Pine-Oak Gall Rust
Introduction Pine-oak gall rust, also referred to as eastern gall rust, is a fungal disease that affects various pine and oak trees. The disease is…
Tree Diseases: Pine-Pine Gall Rust
Introduction Pine-pine gall rust, also referred to as western gall rust, and Woodgate gall rust, is a fungal disease that infects two and three needle…
Tree Diseases: Lophodermium Needle Cast
Introduction Lophodermium needle cast is a fungal disease that affects two and three needled pines, as well as some five needled pines. The disease is…
Tree Diseases: Elytroderma Needle Cast
Introduction Elytroderma needle cast, also known as Elytroderma disease, is a fungal disease of pine trees. It is especially common on ponderosa pine. Elytroderma needle…
Tree Diseases: Dothistroma Needle Blight of Pines
Introduction Dothistroma needle blight, often referred to as red band disease in the western United States, is a devastating foliar disease of pines. The causal…
Insect Profiles: Southern Pine Beetle (Dendroctonus frontalis)
Introduction Southern pine beetle (Dendroctonus frontalis) is a small insect that is native to North America. The insect is considered one of the most destructive…
Tree Diseases: Annosum Root Rot
Introduction Annosum root rot, also referred to as annosus root rot, is a fungal disease of pine, spruce, and fir trees. The causal agent of…
Tree Profiles: Saucer Magnolia Cultivars, Part 2
This is the second half of a two part series on saucer magnolia cultivars. Introduction Saucer magnolia is a popular selection for cultivation. Numerous cultivars…
Tree Profiles: Saucer Magnolia Cultivars, Part 1
This is the first half of a two part series on saucer magnolia cultivars. Introduction Saucer magnolia is a popular selection for cultivation. Numerous cultivars…
Tree Diseases: Rhizosphaera Needle Cast
Introduction Rhizosphaera needle cast is a fungal disease that affects many spruce trees, particularly Colorado blue spruce, and Engelmann spruce. The causal agent of the…
Tree Diseases: Pine Wilt Disease
Introduction Pine wilt disease is an affliction of pine caused by the pine wood nematode, Bursaphelenchus xylophilus. The pine wood nematode is a microscopic parasite.…