Risk of Chilling Disorders in Apples for 2015-16 Storage Season

CIPRA is a computer-based program developed by the research team of Dr. Gaétan Bourgeois (AAFC-QC) that uses weather data to predict the risk of susceptibility of apples to specific storage disorders (Bourgeois, DeEll, and Plouffe). According to the CIPRA model, there is a 26-27% risk of chilling-related disorders developing this storage season, based on weather data from Simcoe (Norfolk County), Ontario (Figure 1). In contrast, using weather data from Frelighsburg, Quebec, CIPRA predicts very little risk (< 2%) of chilling-related disorders developing this storage season (Plouffe et Bourgeois, Bulletin express, 16 septembre 2015, Volume 4 no 6).

To reduce the risk of developing chilling-related disorders, pay close attention and use the recommended temperatures and storage regimes for specific apple cultivars. 'Empire', 'McIntosh', and 'Honeycrisp' are especially susceptible to chilling-related disorders (i.e. flesh browning, low temperature breakdown, core browning, soft scald, soggy breakdown) and symptoms that can usually be induced by using storage temperatures lower than optimum. Late harvested apples are also more prone to developing chilling-related disorders, such as flesh browning in 'Empire' or soft scald and soggy breakdown in 'Honeycrisp'. Therefore, manage your storage periods and marketing accordingly.

Figure 1. Risk of developing chilling-related disorders during 1986 to 2015, for the region of Simcoe

Figure 1. Risk of developing chilling-related disorders during 1986 to 2015, for the region of Simcoe (Norfolk County), Ontario. (text version)

* Graph supplied by D. Plouffe, AAFC-QC


For more information:
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