PEAR TRELLIS RUST HOST PLANTS: Ornamental and fruit bearing Pear trees. Alternate hosts Junipers and Cypress. DAMAGE:The disease is easily detected on pear leaves which become covered with orange spots in early summer and grey, fuzzy growth in the fall. It is usually...
HOST PLANTS: Many aphid species feed on only one plant species, while others feed on hundreds of plant species. DAMAGE: Many species of aphids cause the greatest damage when temperatures are warm but not hot. Plants exhibiting aphid damage can have a variety of...
HOST: Crabapples and apple vary widely in their resistance to scab. Related (but different) species of the fungus that cause apple scab produce scab on hawthorn, mountain ash and pyracantha. DAMAGE: Apple scab describes the disease as it appears on the disfigured host...
