PFD
Fungicide Application Decisions System
for Postbloom Fruit Drop in Citrus
System

1. Bloom Intensity
2. Bloom Stage
3. Prebloom Risk
PFD in last five years
Persistent calyces per tree
Major blooms per year
Susceptibility of PFD
Declining trees
PFD on early bloom
4. Weather Risk
Rain last 5 days
Leaf wetness
Rainfall event
5. Disease Risk
6. Last Fungicide Application
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University of Florida, Gainesville, FL 32611