Tree Diseases: Bacterial Leaf Spot
Introduction Bacterial leaf spot is a disease that affects various crops and ornamental plants. It is most often caused by the bacterial pathogens Pseudomonas spp. and Xanthomonas spp. The infectious…
Tree Diseases: Seiridium Canker (Seridium)
Introduction Seiridium canker is a fungal disease caused by three species of fungi in the genus Seiridium. Of the three, Seiridium cardinale is the most widespread, affecting various members of…
Inspecting Plants for Damage After a Winter Storm
Introduction During the winter months, frigid temperatures and heavy winds can combine to produce fierce storms. Winter storms can feature abundant precipitation – often in the form of ice or…
Tree Diseases: Hypoxylon Canker of Oaks (Hypoxylon atropunctatum)
Introduction Hypoxylon canker of oaks is a fungal disease caused by the pathogen, Hypoxylon atropunctatum. The fungus infects weakened, injured, and dying wood on oak trees. The fungus generally infects…
Insect Profiles: Spruce Spider Mite (Oligonychus ununguis)
Introduction Spruce spider mite (Oligonychus ununguis) is a small pest that infests numerous conifers. The insect is native to North America. It is one of the most destructive spider mites…
Tree Diseases: Honey Fungus (Armillaria)
Introduction Honey fungus, or Armillaria, comprises a genus of parasitic fungi that infect a variety of plants. It is one of the most destructive fungal diseases in the world. The…
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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…
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…
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. Black spot infections seldom kill…
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