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Walnut blight symptoms - Cost 873

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Questions<br />

WB Symptoms assessment:<br />

• Unusual <strong>symptoms</strong> <br />

Climate:<br />

• Leaf wetness ; thermal amplitude ; sunshine duration... need to be tested<br />

Xaj Epidemiology and fungus:<br />

• Fungus = secondary contamination <br />

• Why do we have no fungus and Xaj in more than 50 % of necrosis <br />

Soil water supply:<br />

• Which water pressure threshold to define tree stress (with Watermark® probes) <br />

Phenolic compounds:<br />

• Period of study = too short. Need to do it during the whole season,<br />

• Are flavonoids and HCA the good phenolic family to test / WB <br />

• Correlation between phenolic contains in leaves and fruits <br />

• Do Dualex® measures fit to walnut trees <br />

COST <strong>873</strong> – <strong>Cost</strong>iera 2009 - Italy

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