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MaluSim Carbohydrate Model*
Simulation location: Winchester AREC Simulation date: April 26, 2012 9:30AM
Greg Peck
*Developed by Dr. Alan Lakso, Cornell University
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Winchester, VA April 26, 2012
Temp Max (F)
Temp Min (F)
Solar Rad (MJ/m2/day)
Silver Tip Petal Fall
Intellicast.com forecast
10.1 mm
11.7 mm
-80
-60
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-20
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g C
HO
/day
MaluSim Carbohydrate Model for
Winchester, VA April 26, 2012
Recorded Data
Intellicast.com forecast
Silver Tip March 27
Frost Petal Fall
4.9 mm
6.5 mm
10.1 mm
11.7 mm
13.3 mm
Thinning Index Recommendation
>20 g/day Expect little or no response to normal rates of chemical thinners. You will need to thin more aggressively than normal
+ 20 to -20 g/day Expect normal thinning responses to standard rates of chemical thinners
-20 to -40 g/day Expect normal to slightly aggressive responses to standard rates of chemical thinners
-40 to -60 g/day Expect aggressive responses to standard rates of chemical thinners. Consider reducing rates to avoid over thinning
-60 to -80 g/day Expect very aggressive responses to standard rates of chemical thinners. Reduce rates to avoid over thinning
< -80 g/day Standard rates of thinners will result in severe over-thinning. Reduce rates by at least 50 percent.
Interpreting the MaluSim Model: look for three-day trends
(Table developed by Dr. Steve McArtney (NCSU). Additional input from Drs. Alan Lakso and Greg Peck)
Fruitlet Sizes Cultivar April 28, 2011
Fruitlet size (mm)
April 26, 2012 Fruitlet size
(mm)
Growth Rate over the last six
days
Golden Delicious 5.6 9.9
Red Delicious (Bisbee) 6.0 11.1 0.62 mm/day
Pink Lady 6.3 10.5
Gala 6.5 10.7 0.55 mm/day
Empire 7.1 13.3 0.53 mm/day
York 5.3 10.3
Suncrisp 8.7
Golden Supreme 8.0
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Pre
cipit
atio
n (i
n)
Precipitation (inches)
Cumulative Rainfall (inches)
1971-2000 Average (inches)
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