Alter-Rater Calculator

The ALTER-RATER uses a point system to assist in the timing of fungicide applications for control of Alternaria brown spot in Citrus. The point system is based on temperature, rainfall, and hours of leaf wetness.

Note: The Alter-Rater is currently disabled due to lack of reliable leaf wetness data. We hope to re-release this tool in the future.

Location

Date of Last Spray

Tolerance Level

Heavily Infested Minneola Dancy, Orlando, Sunburst many flatwoods groves east coast and SW Florida

Moderately Infested Minneola or Dancy, Many Murcotts Ridge and North Florida groves

Light Infestations any variety, Mostly Ridge and North Florida groves