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Keeping Quality Forecast

For more information on the Keeping Quality Forecast, please contact the Plant Physiologist, Dr. Peter Jeranyama at (508) 295-2212, extension 29.

View past Keeping Quality Forecasts »

2018 Preliminary Keeping Quality Forecast

The preliminary keeping quality forecast is POOR.

As of April 1, there is only 1 point out of a possible 10 that favor keeping quality for the 2018 Massachusetts cranberry crop. The sole point was awarded for favorable sunshine hours for February (124 hr) which were less than the 50-year average for that month (143 hr). Consequently, the forecast is for poor keeping quality.

The final keeping quality forecast (issued after June 1) could be upgraded if we have a cool and dry April and May. Based on the present forecast, fungicide applications and the rate of fungicides applied should NOT be reduced, and close attention should be paid where fruit rot has been a major or regular concern.

According to Carolyn DeMoranville, former Station Director, a poor keeping quality forecast would be reason to hold late water this year.  However, if you see winter damage from not being under water in December and January, you should not use later water and now is the time to inspect for possible damage.  Based on the current weather, you should not have to start late water particularly early. Late water floods should be applied prior to the breaking of bud dormancy. Generally, the 30-day LW flood will be applied between April 15th and 20th. Do not apply the flood if the buds have broken dormancy.  See Chart Book for more information on late water floods.

Peter Jeranyama, Plant Physiology

2017 Preliminary Keeping Quality Forecast

The preliminary forecast is FAIR to GOOD for keeping quality.

As of April 1, there are 4 of 10 possible points that favor keeping quality for the 2017 cranberry growing season. There were two points awarded for total March sunshine hours and two additional points for average March temperature (below 34° F). The final keeping quality forecast (available after June 1) may improve if temperature and rainfall conditions during April and May are cool and dry.

This preliminary forecast suggests that you could consider reducing the number of fungicide applications in beds where fruit rot has not been a problem every year and bogs where canopy management practices that help reduce fruit rot disease pressure (e.g., sanding, pruning, proper fertilization and irrigation programs) are practiced routinely.

Holding late water can help improve fungicide efficacy and fruit quality, but with last year’s drought conditions, late water should only be considered for beds or varieties with no evident plant stress symptoms such as leaf drop or yellow vine.  Late water should be in place before buds break dormancy (white bud or bud swell first stages). As of April 6, cranberry buds in the Wareham area appear to be dormant.

Follow me on Twitter @esaalau for weekly updates and pictures on bud dormancy starting next week, or call me (Extension 18) with any questions about fungicide programs for this year.  Erika Saalau Rojas (Extension Plant Pathologist)