Cytospora Canker of Spruce Trees
… Other susceptible spruces include black, Norway, Oriental, and white. Colorado blue spruce trees are no longer … than younger ones. The disease often proceeds up the tree destroying branches and the tree’s ornamental symmetry. The most common symptoms of spruce include lower branch die back with …
Cherry Shot Hole Disease
… holes (about ⅛” in diameter) in leaves of cherry trees and cherry laurel shrubs ( Prunus spp.). The two pathogens … drops out, leaving small “shot holes.” Infected cherry tree leaves will turn completely yellow and drop from the … persists. Cherry shot-hole symptoms on cherry laurel shrub Photo: Ask Extension Management Remove older, heavily …
Conifer Bark Beetles on Trees and Shrubs
… usually less than 8mm. They are brown to black in color and cylindrical in shape. The beetles generally attack trees … pheromone, which attracts more bark beetles to the tree under attack. Beetles often carry pathogenic fungi such … weakened trees. Ips or engraver beetles Are more common on the western shore and in central Maryland on …
Boxwood: Identify and Manage Common Problems
… shrubs that are typically used as foundation plantings and backdrops for planting beds, topiaries, and formal … Many species and cultivars are available. The most common pests of boxwood in Maryland are leafminers , psyllids … Fertilizing Miscellaneous Site Proper site selection and plant care are essential for maintaining the health of …
FAQs: Plant and Insect Identification
… is home to a diverse variety of native trees, plants and insects, as well as some unwelcome non-native interlopers. Below are some of the most common questions we receive about both native and non-native … Cost Share Assistance page . How do I distinguish one tree from another? Identifying trees is one of the greatest …
Pruning Shrubs and Hedges in the Home Garden
… Common lilac (Syringa vulgaris). Photo: M. Talabac, UME … tips Before you plant, know the expected mature height and width of the plants you choose. This information can be … cuts to prune shrubs correctly Related information Pruning Tree and Shrub Basics Pruning Trees Pruning Tools Still have …
Verticillium Wilt Disease of Trees and Shrubs
… February 28, 2023 Key points Verticillium wilt is a common disease problem occurring on trees and shrubs caused by the common soil fungus Verticillium spp … lilac, photinia, rose, spirea, viburnum, and weigela. Tree branch with verticillium wilt Photo: Joseph OBrien, USDA …
Lilac: Identify and Manage Problems
… sun and neutral to slightly acidic, well-drained soil. Deer usually avoid browsing on lilac foliage. Not very … from plant to plant but tend to be fruity and/or spicy. Deer resistant. Deciduous azaleas Several deciduous azaleas, … common color, but there are a couple of pink cultivars. Deer resistant. Native roses Native roses, such as Swamp Rose …
Lace Bugs on Trees and Shrubs
… Azalea lace bug damage. Photo: Pest and Diseases Image Library , Bugwood.org Updated: February … of an inch in length when mature. Three species are common shrub pests : the azalea lace bug, andromeda ( Pieris … The damage they cause does not impact the health of the tree. The underside of the leaves of young trees can be …
Powdery Mildew Disease on Trees and Shrubs
… February 27, 2023 Key points Powdery mildew is the common name for the disease and symptoms caused by a closely related group of fungi. …