Wild Blueberry Monilinia Blight Update - May 22, 2012

Tuesday, May 22, 2012

Apothecial cups have dried up in all areas of Nova Scotia that we monitor. Therefore, this will be the last Monolinia blight update for the 2012 season. Thanks to all the grower cooperators who helped with this program.

Botrytis Blight:

Botrytis blight monitoring will not be conducted in the Parrsboro area in 2012. Botrytis blight is primarily a bloom time disease and can be serious if foggy, wet weather occurs for extended periods during flowering. It is particularly important in coastal areas where foggy, wet conditions frequently occur.

The decision to apply fungicides must be made early in the disease cycle before Botrytis becomes well established. If a field is deemed to be at risk from Botrytis, the first fungicide should be applied prior to an infection period if the field has reached 50% open flowers. A second application may be required in 7 to 10 days if wet weather persists. Registered fungicides include captan, Senator, Lance, Elevate, Switch, and Pristine. Refer to product labels for further information and precautions.

Fields with tall, dense canopies are very prone to Botrytis. In these tall, dense canopies Botrytis may persist well beyond the bloom period causing leaf and stem damage which impacts yield. Under these conditions, Botrytis is impossible to control.