Thursday, April 15, 2010

Apple Scab Control 2010

Apple scab, caused by the fungus Venturia inaequalis, is an important constraint on apple production in the Midwest. The primary inoculum for apple scab develops in the spring in infected leaves on the orchard floor from the previous season. If primary scab infection is not controlled, significant levels of leaf and fruit infection can be expected. Infection periods for apple scab occur every year in northern Illinois orchards. Although apple varieties with resistance to scab do exist, these varieties are not widely planted; thus, scab must be actively controlled each year through intensive usage of fungicides. This intensive fungicide usage has led to the development of resistance in V. inaequalis to some classes of fungicides such as dodine and the benzimidazoles in Michigan and elsewhere across the United States where apple scab is prevalent. The following article from the IPM - Crop Advisory Team Alerts - Fruit > MSU Fruit Crop Advisory Team Alert newsletter will give a fungicide spray protocol for those orchards where resistance to these fungicides has developed.

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