Among the stages of cranberry production, the fruit set period is a crucial stage in the production cycle and occurs in from late June into July, following pollination of the flowers.
It is during this phase that the pollinated flowers begin their transformation into fruit. However, it is important to remember that not every flower will produce fruit. The fruit set rate, which is the percentage of flowers that successfully develop into fruit, is an excellent indicator of pollination success and, therefore, yield potential.
Throughout this period, several key interventions are carried out in the field.
Regular pest monitoring (Integrated Pest Management scouting) is essential to limit damage to developing fruit and the vines canopy. This monitoring allows for rapid intervention when necessary, in accordance with current practices and regulations.
At the same time, fertilization continues to support fruit growth. Balanced inputs of nutrients such as nitrogen, phosphorus, potassium, and micronutrients are essential at this stage, as they support fruit development and vegetative growth.
Irrigation is also a valuable tool during fruit set. It is used not only to meet the plants' water needs, but also as a means of protection against heat stress. Watering can help preserve flowers and developing fruit in the event of extremely high temperatures or, conversely, in the event of excessively cool nights.
Nighttime temperatures also play a decisive role in successful fruit set. Cool nights are favorable because they limit the plant's cellular respiration, allowing it to devote more energy to fruit development. Conversely, it has been observed that excessively high minimum nighttime temperatures in July are detrimental to future yields.
Finally, other aspects of management also contribute to successful fruit set. Cranberry vine canopy management is essential. This is achieved by maintaining the number of plants per unit area, i.e. the density, at optimal levels. Too many uprights leads to excessive competition for water and nutrients and can limit fruit development. In addition, careful monitoring of micronutrient deficiencies, particularly boron and copper, is important, as these elements play a key role in flower formation and strength.
The fruit set period is therefore one of the most critical stages in the cranberry growing season. It depends on a series of interrelated factors and requires close attention from growers to maximize fruit set and ensure a bountiful, high-quality harvest.
It’s the simple everyday things that make our berries so tender, tasty, healthy and give them the perfect texture. Each parcel of land we farm with care and respect. Each extra day we wait to ensure crops are harvested at peak ripeness. Each minute saved between field and freezer. Each berry perfectly preserved. Each unwanted substance detected and eliminated. And each delicious bite our customers enjoy.
