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...
HOST PLANTS: Favoured host plants include Apple, Crabapple, Hawthorn, Cherry, Mountain-Ash, Cotoneaster and other members of the rose family. DAMAGE: This insect is one of the most widespread defoliators of deciduous trees. The young caterpillars quickly gather at a...
