Insect & Disease Resource Center
Search Results
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Bacterial Wetwood and Slime Flux
Bacterial wetwood is a bacterial infection that causes a profuse flow (flux) of sap from trunk wounds or pruning cuts.
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Bagworms
Bagworms are destructive pests of shrubs and woody ornamentals that are native to North America. Their spindle-shaped protective bags made from silk, debris and foliage provide camouflage, so they go unnoticed until there is significant plant damage.
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Birch Leafminer
Birch leaves develop brown, inflated blotches by mid to late spring. Leaves may be killed by small larvae inside the leaves that devour green tissues between the upper and lower surfaces. A severely infested tree canopy takes on a tan-brown appearance and defoliates prematurely. Repeated years of infestation can cause branch die-back and leave trees more vulnerable to borers and environmental stress.
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Boxwood Blight
Boxwood blight is a serious disease caused by a fungal pathogen, Calonectria pseudonaviculata; previously named Cylindrocladium buxicola.
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Boxwood Decline
Boxwood decline is a condition that causes weak growth, discoloring of leaves and branch dieback in boxwood shrubs. This condition usually involves several factors, including poor planting conditions and improper cultural practices, as well as stem and root diseases.
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Boxwood Leafminer
Boxwood Leafminer are small flies that attack several varieties of boxwood, causing the usually dense foliage to appear weak and lackluster. These pests can kill boxwood twigs and cause mature plants to become susceptible to other diseases, including winter-kill in colder climates.
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Cytospora Canker
The plant pathogenic fungus Leucostoma kunzei (formerly Valsa kunzei) is the causal agent of cytospora canker, a disease of some conifers found in the Northern Hemisphere, predominantly on Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens).