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Postbloom fruit drop (PFD) caused by Colletotrichum acutatum, affects citrus flowers and produces abscission of young fruitlets. PFD is a serious problem in most humid citrus production areas of the Americas. Because a predictive model previously developed in Florida to time fungicide applications was inadequate for use in many other regions, an expert system (PFD-FAD) with broader applicability was developed and implemented in Java Servlet. The PFD-FAD system considers previous history of PFD in the grove, susceptibility of the citrus species, the stage of the bloom as well as rainfall, duration of leaf wetness following the rain, and the current inoculum levels in the grove. It predicts the need for a fungicide application based on these factors and the time since the last application. The PFD-FAD system is easy to use and minimizes the need for scouting of groves and acquisition of exact weather information, and is more widely applicable to other regions. The PFD-FAD system was compared to the PFD model, the grower's program, and to a nonsprayed control in Brazil in 2001. The PFD model indicated 2 sprays were needed, PFD-FAD indicated one spray, and the grower made 3 applications. All programs reduced counts of persistent calyces by about 50% and increased fruit counts by about 20%. Cost savings with the use of PFD-FAD was about $47/ha.

A Fungicide Application Decision (FAD) Support System for Postbloom Fruit Drop of Citrus (PFD)