Increased volatility in temperatures are creating less predictable snow packs, hotter summers, and changes to seasonal patterns that will affect orchard productivity and quality. High yields and reduced losses to disorders will be required to maintain profitability and to increase the sustainability of production under these changing environments. Irrigated regions of the Western North America rely on a steady supply of water from melting snowpack in nearby mountain regions. In these areas, decreased summer water flows will require the development of water conservation practices that do not negatively impact productivity or quality. Earlier bud break and later frosts will change dormancy and chilling patterns and change frost risk for most apple production regions in the country. Lastly, higher summer temperatures and earlier fruit maturity will increase the risk of sun-related damage. All of these impacts will require changes to management practices that conserve resources while still maintaining quality and productivity. Here, we highlight several strategies to mitigate the impacts of climate change and conserve water resources. These include the use of protective netting to optimize the light environment to reduce heat related losses while also conserving water through reduced evapotranspiration and reduced evaporative cooling. Other strategies include irrigation management to reduce postharvest losses due to heat and nutrient imbalances in susceptible cultivars. Lastly, we highlight the need for more research to develop cultivars that can better withstand changing environmental pressures. These combined strategies will better guide mitigation and adaptation strategies that will help maintain apple production in the future.
Developing Resilient Orchards - ACARN Keynote Lee Kalcsits
1. Lee Kalcsits, Assistant Professor
Department of Horticulture
Washington State University
Developing Resilient Orchards
B.C. AGRICULTURAL CLIMATE ADAPTATION RESEARCH NETWORK
Provincial Workshop; Kelowna, BC, Canada
December 2, 2019
2. Acknowledgements
Acknowledgements
USDA
Resilient Orchards
Washington Tree Fruit Industry
and WSU collaborators
Entire Kalcsits’ Lab Group and specific
contributions from Dr. Giverson
Mupambi, Dr. Jessica Waite, Dr.
Sumyya Waliullah, Michelle Reid
Kirti Rajogopalan, Hossein Noorazar,
Vince Jones, Matt Jones
Stefano Musacchi, Sara Serra, Tory
Schmidt, Desmond Layne
4. Acknowledgements
Growing Fruit in a Desert Climate
Resilient Orchards
Advantages Disadvantages
• Low disease pressure
• Low insect pressure
• Hot days and cool nights mean
• high quality fruit
• High light environment
• Control over water delivery
• Excess heat and light pressure
• Increased water use
• Reliance on water to grow fruit
Challenges and
Opportunities
17. Acknowledgements
Shifting Pest Pressure
Resilient Orchards
Historical 2040s 2060s
• Approximate shift of 8 days every 20 years.
• Similarly, all other stages are shifted.
2080s
ADULT FLIGHT OF
OVERWINTERING GENERATION
March,11
May, 10
V.Jones and M. Jones
18. Acknowledgements
Shifting Pest Pressure
Resilient Orchards
• % years when more than 75% of 3rd generation eggs hatch
into larvae
• By 2040s all of Washington can expect a strong 3rd
generation.
Historical 2040s
INCREASED RISK OF A THIRD
GENERATION
V.Jones and M. Jones
19. Acknowledgements
Shifting Pest Pressure
Resilient Orchards
• % years when more than 75% of 4rd generation eggs hatch
into larvae
2040sHistorical 2060s 2080s
AND A 4th GENERATION TO DEAL
WITH
V.Jones and M. Jones
21. Heat
Resilient Orchards
40
50
60
70
80
90
100
110
120
1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep
Dailymaximumtemperature(°F)
Date
WSU TFREC- Wenatchee
2012 season 2013 season 2014 season 2015 season 2016 season
• High temperatures (June-August), average maximum
temperature of 88-90°F
• Fruit Surface Temperatures are about 20 °F more than the air
22. Resilient Orchards
Changes in Sunburn Risk
Days per year above 95°F
5 50 100 200
PNW = 5 -> 22
NE = 2 -> 30
MW = 3 -> 46
SA = 7 -> 52
AUS = 11 -> 54
S. Europe = 0 -> 27
26. Acknowledgements
Netting to Optimize Light and Fruit Surface Temperature
USDA
Resilient Orchards
Dr. Giverson
Mupambi
Dr. Stefano Musacchi, Dr. Sara Serra, and Dr. Desmond Layne (WSU), and Tory Schmidt
(Washington Tree Fruit Research Commission)
27. Resilient Orchards
Decreased Light Intensity*
Increased Light Scattering
Light Quality
Decreased water use
No EC
Less irrigation
requirements
Decreased soil temperature*
Increased Fruit Size
Decrease in color if
shade % is too high*
Decreased sunburn
Increased light-use efficiency*
Increased photosynthesis*
Increased canopy in-fill*
Environment
Fruit Quality
Tree Growth
Advantages of Netting
(Mupambi et al. 2018a; Mupambi et al. 2018b; Mupambi et al. 2019)
28. 0
500
1000
1500
2000
2500
Light(umolm-2s-1)
8/6/18 to 8/10/18 (Smoke Haze)
7/23/18 to 7/27/18 (Clear)
Resilient Orchards
Challenges to Adoption
Economics
Smoke at the wrong time Labor to install and retraction
and deployment
What is the price point where it makes sense?
Retrofit? Netting system?
Added benefits?
29. Resilient Orchards
What about the rest of the cultivars or low light environments?
Dr. Sumyya Waliullah and Dr. Jessica Waite
40
50
60
70
80
90
100
110
120
1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep
Dailymaximumtemperature(°F)
Date
WSU TFREC- Wenatchee
2012 season 2013 season 2014 season 2015 season 2016 season
Evaporative cooling
30. Differences in Fruit Surface Temperatures
Resilient Orchards
HoneycrispGranny Smith
Light Intensity
Light Intensity
Air Temperature
Air Temperature
Credit: Brenda Castaneda and Hector Camargo-Alvarez
37. Acknowledgements
We can over irrigate
USDA
Resilient Orchards
-27.5
-27
-26.5
-26
-25.5
-25
-24.5
-24
-23.5
-23
100 150 200 250 300 350 400
δ13C
Fruit Size (g)
38. Integrated Nutrient
Management
Sunburn and Bitter Pit in Washington State
Resilient Orchards
Calcium sprays and crop
load are current tools to
reduce bitter pit
Irrigation has been
tested as a tool over
three years
5-15% decrease in bitter
pit incidence
Potential $30-$60
million/year impact
Rapidly being adopted
throughout the state
8 ± 1.3%
11 ± 4.9%
27 ± 4.4%
41 ± 5.3%
4 ± 2.2%
9 ± 4.5%
Fully Irrigated
38 ± 12.3%
24 ± 1.63%
18 ± 9.5%
18 ± 2.6%
2 ± 1.7%
0%
Deficit Irrigation
Michelle Reid (MS.
Student)
Irrigation Management to Improve Honeycrisp Fruit Quality
39. Acknowledgements
Summary
Resilient Orchards
Shifting chilling and phenology
Earlier seasons mean earlier maturity at times when fruit is highly
susceptible to high temperatures
Earlier seasons increase the number of generations for pests like coddling
moth that make management much more difficult
Elevated sunburn risk
Netting as an alternative to evaporative cooling
Reduced fruit losses to sunburn and mechanical damage
Cultivars selected for high temperature environments
Increased volatility in water availability
Increasing reliance on irrigation for apple production in traditionally non-
irrigated regions
Irrigation strategies that improve fruit quality/reduce losses while
conserving water
Identifying economic benefits of conservation practices will
increase rates of adoption by the industry,