A grey fungus, Botrytis cinerea or Botrytis, that affects winegrapes. It is also called Botrytis bunch rot. The fungus gives rise to two different kinds of infections. The first, grey rot, is the result of consistently wet or humid conditions, and typically results in the loss of the affected bunches. The second, German, occurs when drier conditions follow wetter, and can result in distinctive sweet dessert wines.
The fungus (Botrytis cinerea) which causes this disease produces spores during the bloom period primarily on dead weeds within the field and on weeds bordering the field.
Since Botrytis blight does not cause any permanent damage to plants, the decision to control blight is based on the cost of the control measures, the value of blueberries and the expected crop loss from blight.
Fungicides for Botrytis blight control should be applied prior to the commencement of any wet periods, on a seven to ten day schedule between mid-bloom and the end of the bloom period.
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