Physiological Disorders of Trees: Fertilizer Burn
During the growing season, one of the most common horticultural practices is the fertilization of plants. While fertilizer accelerates the growth of many plants, it…
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Tree Diseases: Brittle Cinder (Kretzchmaria deusta)
Introduction Kretzchmaria deusta, also referred to as brittle cinder, and previously known by the scientific name Ustulina vulgaris, is a fungus and plant pathogen that…
Insect Profiles: Viburnum Leaf Beetles (Pyrrhalta viburni)
Viburnum leaf beetle (Pyrrhalta viburniI) is an insect that feeds on the foliage of viburnum plants. The beetle is native to Europe and Asia. It…
Insect Profiles: Cottonwood Leaf Beetle (Chrysomela scripta)
Introduction Cottonwood leaf beetle (Chrysomela scripta) is a significant defoliator of aspen, cottonwood, poplar, and willow. The insect is a native pest that occurs throughout…
Insect Profiles: Brown Marmorated Stink Bug (Halyomorpha halys)
Introduction Brown marmorated stink bug (Halyomorpha halys), often abbreviated to BMSB, and sometimes referred to as a stink bug, is a true bug in the…
Root Diseases: Phytophthora Root Rot
Introduction Phytophthora root rot is one of the most significant root diseases of woody ornamentals, and herbaceous plants. It is caused by a multitude of…
Tree Diseases: Black Knot (Apiosporina morbosa)
Black knot (Apiosporina morbosa) is a fungal disease that infects over 25 species of Prunus. It is caused by the fungus Apiosporina morbosa. Outbreaks of…
Insect Profiles: Whitefly (Trialeurodes vaporariorum)
Introduction Whitefly is a small insect that infests a diverse array of plants. More than 1,500 species of whitefly have been discovered worldwide. Whiteflies comprise…
Insect Profiles: Western Tent Caterpillar (Malacosoma californicum)
Introduction Western tent caterpillar (Malacosoma californicum) is a significant defoliator of broadleaved trees and shrubs. It is one of the most frequently observed and widely…
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…
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…