Education Commons^™

G97-1327 Cedar-Apple And Related Rusts Of Apple And Ornamentals, Don Steinegger, Jane A. Christensen

University of Nebraska-Lincoln Extension: Historical Materials

Discussion of complex inter-species disease life cycle in junipers and apple trees, description of symptoms, control measures, and lists of varieties of species resistant to cedar-apple rust and related rusts.

Cedar-apple rust is a disease that causes substantial injury to apple and crabapple trees in Nebraska. The disease is caused by the fungus Gymnosporangium juniperi-virginianae and occurs wherever apples and junipers are grown in close proximity.

G97-1326 Crabapples For Nebraska Landscapes, Don Steinegger, John E. Watkins

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide discusses the selection, care and disease possibilities of crabapples.

Many of the diminutive flowering trees are not hardy in Nebraska. One notable exception: the ornamental crabapple tree (Malus). By carefully selecting the planting site and the cultivar, the beauty of flowering crabs can be enjoyed in any part of the state.

Regardless of the season, crabapples lend landscape color and interest. The winter branch pattern and bark color are as much an asset as spring's flower color.

G97-1321 Powdery Mildew Of Landscape Ornamentals, John E. Watkins

University of Nebraska-Lincoln Extension: Historical Materials

Powdery mildew can diminish the beauty of landscape ornamentals; however, it can be controlled through cultural practices or chemical alternatives.

Powdery mildew is the name for the grayish white powdery coating of fungus mycelium and masses of spores growing on plant leaves, shoots and flowers. This disease is caused by a distinct group of similar fungi that attacks a wide variety of plants. Lilac, zinnia and many other flowers and shrubs can be damaged. Although plants infected with powdery mildew rarely die, the disease detracts from the natural beauty of ornamentals. Damage ranges from an unsightly white powdery coating on …