2013 peach review & upcoming challenges...2013 weather warm…then cold! 0 10 20 30 40 50 60 70...
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![Page 1: 2013 Peach Review & Upcoming Challenges...2013 Weather Warm…then cold! 0 10 20 30 40 50 60 70 80 90 1-Dec-12 8-Dec-12 15-Dec-12 22-Dec-12 29-Dec-12 5-Jan-13 12-Jan-13 Citra, FL Minimum](https://reader033.vdocuments.us/reader033/viewer/2022050415/5f8bad12844f693c4876b014/html5/thumbnails/1.jpg)
2013 Peach Review & Upcoming ChallengesDr. Mercy Olmstead, UF/IFAS Extension
2013 Winter Pruning Workshop
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2013 Weather
Warm…then cold!
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1-Dec-12 8-Dec-12 15-Dec-12 22-Dec-12 29-Dec-12 5-Jan-13 12-Jan-13
Citra, FL
Minimum Temp. Maximum Temp
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1-D
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9-D
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-De
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c-1
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2-J
an-1
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4-J
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6-J
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8-J
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10
-Jan
-13
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-Jan
-13
14
-Jan
-13
Lake Alfred, FL
Minimum Temp. Maximum Temp.
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9-D
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2-J
an-1
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4-J
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6-J
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8-J
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-Jan
-13
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14
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Fort Pierce, FL
Minimum Temp. Maximum Temp.
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How Do We Accumulate Chill?
Different varieties require different amounts of chill
Flower buds need less cold weather than the vegetative buds
Vegetative buds are necessary for good fruit quality, so this is often what contributes to poor sugar accumulation and flavor development in low-chill accumulation years.
Carbohydrates produced via photosynthesis = sugars for fruit
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Ecodormancy
Buds on the fruit or nut tree/bush/vine are dormant due to environment.
Water stress
Cold temperatures
Shortening of the daylength (photoperiod)Photoperiod – length of light and dark periods affect plant processes
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Endodormancy
Buds are dormant due to internal physiological blocks
Despite ideal environmental conditions
Chilling conditions above freezing end physiological block
Advantages:
Keeps plants dormant during fluctuating temperatures
Subtropical climate and frequency of entering this stage?
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Chilling requirements
Measured based on different models
Standard method – chill hourAnything less than 7.2°C = chill unit accumulation
Utah chill model (Richardson et al., 1987)Temperatures between 1.6-12.5°C promote chill accumulation
7°C is ideal (1 hr. @ 7°C = 1 chill unit)
Dynamic method – chill portione.g. 1 portion = 28 hours at 6°C
More recent, used with chemical rest-breaking agents such as hydrogen cyanamide (cherries in California)
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Utah Chill Model
Allows for addition and subtraction of chill units accumulated over winter
Temperature Chill Unit
< 34.5°F 0.0
34.7 – 36.5°F 0.5
36.6 – 48.4°F 1.0
48.5 – 54.3°F 0.5
54.5 – 60.6°F 0.0
60.8 – 64.4°F -0.5
> 64.5°F -1.0
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Frost Events
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-12
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2-F
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-12
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1-M
ar-1
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3-M
ar-1
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5-M
ar-1
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7-M
ar-1
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9-M
ar-1
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-Mar
-12
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-Mar
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-Mar
-12
Citra, FL
February 12, 2013 = 27 degrees February 13, 2013 = 22 degrees
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Precipitation and FloodingJune 1 – August 1, 2013
FAWN Station Rainfall (in.)
Citra, FL 23.85
Lake Alfred, FL 26.95
Fort Pierce, FL 18.48
Washed out nutrients in the soilStunted treesRoot damage from flooding = early defoliation, early bloom
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Effect of Fertilization Method on Growth, August 2013
Fertilized Monthly Split Application - June
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Weather Effects
Frost reduced potential yields
Warm winter = extended bloom period
Diseases and insects worse with precipitation in late June/July
Leaf rust
Scale
White Peach Scale
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Upcoming Challenges –Early Bloom!
Be sure to get your oil sprays on for scale control – those that sprayed it did not appear to defoliatetrees.