Monthly Archives: March 2018

Current conditions at MCAREC for Sweetheart

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The current assessment of ‘Sweetheart’ sweet cherry development and freeze tolerance at MCAREC. The left axis shows the ambient air temperature and the predicted lethal temperature for floral primordia (solid lines). The right axis shows the hours of developmental time for the current and seasonal averages of Sweetheart at MCAREC (dotted lines).

A close-up of MCAREC is shown below.

Other location, station and cultivar data is being prepared.

At present, sweet cherry at MCAREC is out of ecodormancy and about 2 weeks ahead in development compared to a 5-year average.

 

2018 assessment of freeze tolerance in Sweet Cherry

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The FTEED model predicts lethal temperatures in dormant sweet cherry floral buds based on experiments using differential thermal analysis of supercooled pistils. Values for the cultivar “Regina” are 5 to 7 degrees colder than shown here for most cultivars.

FTEED daily predictions begin at midnight and are based on degree hour accumulation during the previous days.

Temperature data were obtained from the Columbia Gorge Fruit Growers Weather Network (weatherr.cgfg.org), Integrated Fruit Production Network, ifpnet.com (named stations), and the AgriMet Cooperative Agricultural Network, usbr.gov/pn/agrimet (all caps).

This research is supported by grants from the Northwest Cherry Research Commission and Oregon Sweet Cherry Commission.

 

 

2018 Recent analysis of the freeze tolerance of Sweet Cheery floral primordia. Location, The Dalles Oregon.

Method: Differential thermal analysis of 85 floral buds per date and cultivar.

Table of Lethal Temperatures (deg F) determined by DTA; minimum temperatures and visual assessment of flower damage in the orchard; relative water content (RWC) and bud phenology.

DateLocationStationCultivarLethal 10%Lethal 50%Lethal 90%Orchard MinimumOrchard MortalityRWCPhenology
2/26/2018The DallesCooper BarnSweetheart6-2-4.526.515.1%58.7%first-swelling
2/21/20188.9
2/20/2018The DallesCooper BarnSweetheart7.7-0.9-4.717.40.1%59.8%first-swelling
2/13/201819.1
2/16/2018The DallesCooper BarnSweetheart4.5-0.4-2.13657.8%first-swelling
2/12/2018The DallesCooper BarnSweetheart10.21.4-0.522.957.5%first-swelling
2/8/2018The DallesCooper BarnSweetheart4.80.6-1.538.256.6%
1/31/2018The DallesCooper BarnSweetheart0.3-3.4-5.932.754.1%dormant
1/25/2018The DallesCooper BarnSweetheart-2.1-4.4-6.829.453.8%dormant
1/18/2018The DallesCooper BarnSweetheart-3.3-6-8.232.154.1%dormant
1/11/2018The DallesCooper BarnSweetheart-4-7-9.635.353.7%dormant
1/3/2018The DallesCooper BarnSweetheart-3.3-5.8-8.62952.1%dormant
12/27/2017The DallesCooper BarnSweetheart-4.8-9.6-12.123.751.8%dormant
12/19/2017The DallesCooper BarnSweetheart-3.4-5.8-8.534.153.6%dormant
12/15/2017The DallesCooper BarnSweetheart-2.4-5.3-7.429.652.4%dormant
12/1/2017The DallesCooper BarnSweetheart-0.7-2.4-4.531.453.6%dormant
11/23/2017The DallesCooper BarnSweetheart-0.4-2.9-4.643.356.2%dormant
11/22/2017The DallesCooper BarnSweetheart0.1-3-5.341.7dormant
11/17/2017The DallesCooper BarnSweetheart0.1-3-5.130.653.6%dormant
11/10/2017The DallesCooper BarnSweetheart-1-3.2-534.857.3%dormant
11/3/2017The DallesCooper BarnSweetheart9.12-3.431.854.2%dormant
10/27/2017The DallesCooper BarnSweetheart14.37.93.335.654.9%dormant
10/20/2017The DallesCooper BarnSweetheart15.310.64.537.154.9%dormant
10/12/2017The DallesCooper BarnSweetheart13.111.69.434.353.7%dormant
10/6/2017The DallesCooper BarnSweetheart17.915.213.835.153.1%dormant
9/29/2017The DallesCooper BarnSweetheart22.647.153.6%dormant
DateLocationStationCultivarLethal 10%Lethal 50%Lethal 90%Orchard MinimumOrchard MortalityRWCPhenology
2/26/2018The DallesCooper BarnRegina-3.7-7.1-9.926.52.1%53.2%dormant
2/21/20188.9
2/20/2018The DallesCooper BarnRegina-7-10.4-12.917.40.0%53.8%dormant
2/13/201819.1
2/16/2018The DallesCooper BarnRegina-2.9-5.9-8.73652.4%dormant
2/12/2018The DallesCooper BarnRegina-2.8-5.5-8.522.953.0%dormant
2/8/2018The DallesCooper BarnRegina-4.6-7.4-9.738.252.4%dormant
1/31/2018The DallesCooper BarnRegina-5.5-8.7-11.732.752.2%dormant
1/25/2018The DallesCooper BarnRegina-5.2-8.4-10.829.452.5%dormant
1/18/2018The DallesCooper BarnRegina-4.7-8.1-11.332.153.4%dormant
1/11/2018The DallesCooper BarnRegina-5.9-8.6-1135.353.5%dormant
1/3/2018The DallesCooper BarnRegina-4.5-8.7-11.62951.7%dormant
12/27/2017The DallesCooper BarnRegina-9.8-13.1-14.523.752.1%dormant
12/19/2017The DallesCooper BarnRegina-2.9-7-9.634.154.0%dormant
12/15/2017The DallesCooper BarnRegina-4.4-7-9.629.652.1%dormant
11/22/2017The DallesCooper BarnRegina-3.4-5.7-8.141.7
DateLocationStationCultivarLethal 10%Lethal 50%Lethal 90%Orchard MinimumOrchard MortalityRWCPhenology
2/26/2018The DallesPylesChelan4.3-2.6-5.231.45.9%56.3%first-swelling
2/23/201814.4
2/20/2018The DallesPylesChelan0.1-4.1-6.620.10.0%56.7%first-swelling
2/13/201820.8
2/16/2018The DallesPylesChelan1.5-1.3-3.53954.4%dormant
2/12/2018The DallesPylesChelan6.90.4-1.326.956.2%dormant
2/8/2018The DallesPylesChelan5.8-1-3.643.455.0%dormant
1/31/2018The DallesPylesChelan-1.8-4.2-6.635.852.1%dormant
1/25/2018The DallesPylesChelan-2.4-5.1-7.331.751.9%dormant
1/18/2018The DallesPylesChelan-1.7-4.9-7.532.152.5%dormant
1/11/2018The DallesPylesChelan-3.1-6.1-9.437.452.9%dormant
1/3/2018The DallesPylesChelan-3-6.3-8.928.650.5%dormant
12/27/2017The DallesPylesChelan-8.1-11.2-12.925.150.2%dormant
12/19/2017The DallesPylesChelan-2-4.4-738.352.3%dormant
12/15/2017The DallesPylesChelan-3.1-5.4-7.530.451.5%dormant
11/22/2017The DallesPylesChelan-1-3.2-542.7
DateLocationStationCultivarLethal 10%Lethal 50%Lethal 90%Orchard MinimumOrchard MortalityRWCPhenology
2/26/2018The DallesPylesBing4.4-1.3-3.631.45.4%57.9%first-swelling
2/23/201814.4
2/20/2018The DallesPylesBing0.1-3.4-6.520.10.0%57.2%first-swelling
2/13/201820.8
2/16/2018The DallesPylesBing1.8-0.7-3.13956.6%first-swelling
2/12/2018The DallesPylesBing3.80-2.326.955.3%dormant
2/8/2018The DallesPylesBing1.4-1.3-3.743.454.7%dormant
1/31/2018The DallesPylesBing-2.2-4.3-6.335.852.2%dormant
1/25/2018The DallesPylesBing-1.5-4.4-6.431.752.4%dormant
1/18/2018The DallesPylesBing-0.9-4.2-6.532.152.5%dormant
1/11/2018The DallesPylesBing-2.9-6-8.737.451.8%dormant
1/3/2018The DallesPylesBing-2.5-5.1-7.228.650.9%dormant
12/27/2017The DallesPylesBing-6.4-10.5-12.725.149.7%dormant
12/19/2017The DallesPylesBing-1.8-4.5-6.538.351.6%dormant
12/15/2017The DallesPylesBing-1.9-4.1-6.430.451.1%dormant
11/22/2017The DallesPylesBing-1.4-3.6-5.842.7