Insect Profiles: Knopper Gall Wasp (Andricus quercuscalicis)
Introduction Knopper gall wasp (Andricus quercuscalicis) is a gall wasp species that infests two types of oak trees: common oak, and turkey oak. The word knopper is derived from the…
Insect Profiles: Magnolia Scale (Neolecanium cornuparvum)
Introduction Magnolia scale (Neolecanium cornuparvum) is an insect that feeds exclusively on magnolia plants. It is one of the largest scale insects in the United States. The insect feeds by…
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 can also be detrimental to…
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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 infects a wide range of…
Chrysomelidae - Pyrrhalta viburni
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 was first identified in North…
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 the United States. While it…
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 family Pentatomidae. Brown marmorated stink…
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 fungus-like organisms, which infect susceptible…
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 black knot may occur in…
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 the family Aleyrodidae. The nymphs…
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