ANTHRACNOSE Anthracnose may cause defoliation on most maple, oak, elm, walnut, birch, sycamore, and hickory trees. Occasionally May infect leaves, twigs, buds, shoots, and even the fruit of various landscape trees Raking and removing infected leaves will remove the main source of spores that could infect the tree next spring
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ANTHRACNOSE Anthracnose may cause defoliation on most maple, oak, elm, walnut, birch, sycamore, and hickory trees. Occasionally, it can affect ash and.
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ANTHRACNOSE
Anthracnose may cause defoliation on most maple, oak, elm, walnut, birch, sycamore, and hickory trees. Occasionally, it can affect ash and linden trees.
May infect leaves, twigs, buds, shoots, and even the fruit of various landscape trees
Raking and removing infected leaves will remove the main source of spores that could infect the tree next spring
APPLE SCAB• Most severe during spring and early summer
when the humidity is high and the temperature is moderate
• Most obvious symptoms occur on leaves and fruit in the spring and summer, and look like small velvety brown-olive green spots that enlarge and darken to become more or less circular
Can defoliate trees and blemish fruit making them unmarketable
Before an apple can be infected, adequate moisture must be present in a temperature range from 46-75F to allow for formation of basidiospores on cedar galls
• Leaves are most susceptible to infection when 4-8 days of age
• Fruit are susceptible from tight cluster through bloom
Control• Fungicides• Using resistant
varieties
CROWN GALL• Can infect a wide range of herbaceous and woody plants
• Usually restricted to the roots, lower stems, and lower branches of infected plants
• Caused by the soil-borne bacterium Agrobacterium tumefaciens
Management
• Avoid wounding plants near the soil line• Prune infected plants (Disinfect cutting tools
between each cut)
FIREBLIGHT A bacterial disease that can kill branches and whole plants of
many members of the rose family, including apple, pear, quince, and crabapple
Can be spread by insects, splashing rain or contaminated pruning tools
Symptoms• Dead branches• Water-soaked
blossoms• Light brown/blackened
leaves• Discolored bark• Black “shepherd’s
crook” twigs• Dried fruit
Management• Pruning (Sterilize all tools after each cut)• Chemical Sprays