Fire Blight Prediction Pears
Below is the seven day predicted Fire blight risk maps based on the Cougarblight model.
To use the maps below, orchards must be assigned to one of two categories based on the fire blight situation in the orchard last year and this year as follows:
Once the orchard has been assigned to one of the categories above, locate the region the orchard is in and follow the animated maps for the predicted fire blight risk corresponding to the date at the top of the map.
The following risks are colour coded and designated as follows:
Low: Indicates a low risk of fire blight occurring. Wetting of blossoms during these temperature conditions has not resulted in new infections in past years. The blossoms within a few meters of an active canker may be an exception.
Caution: Wetting of flowers under these temperature conditions is not likely to lead to infection, but the possibility increases if the weather becomes warmer and wetter. Weather forecasts should be carefully monitored. If antibiotic materials are not being used, blossom protection with other materials should be initiated one or two days prior to entering a high infection risk period. Continue appropriate protective sprays until the infection risk drops below the "high" threshold.
High: Under these temperature conditions, serious outbreaks of fire blight have occurred. Orchards that recently had blight are especially vulnerable. The risk of severe damage from infection increases during the later days of the primary bloom period, and during petal fall, while blossoms are plentiful. Infection is common, but more scattered when late blossoms are wetted during high risk periods. The potential severity of infection increases if a series of high risk days occur.
Extreme/Exceptional: Some of the most damaging fire blight epidemics have occurred under these optimum temperature conditions, followed by blossom wetting. These infections often lead to severe orchard damage, especially during primary bloom or when numerous secondary blossoms are present. As the season progresses, secondary blossoms tend to form less frequently, and hot summer temperatures of 35°C and above greatly reduce the frequency of new blossom infections.
Current growth stages for key pear growing regions
|Creation Date:||22 June 2017|
|Last Reviewed:||22 May 2019|