UGA PEACH BLOG

Early Green Fruit Rot

This photo shows green fruit rot (caused by Monilinia fructicola) on insect-damaged peaches (photo taken today from fruit collected in an ‘O’Henry’ block at the USDA research station in Byron, GA).  I have never personally observed green fruit rot this early, but it does occur from time to time.  If insect management has been disrupted due to rainfall, infection by Monilinia can be prevalent, as the insect injury sites serve as infection points. This increase in diseased fruit is also in part due to increased inoculum from blossom blight (also prevalent this year), so this is basically stage 2 of the epidemic.  This will set us up for a difficult brown rot year if rainy conditions prevail throughout the season.  Producers need to adjust their spray programs with this eventuality in mind.  More Captan applications for cover sprays will be warranted, especially if rainfall continues to be excessive, and use of more efficacious preharvest materials is also advised (Merivon, Elite, etc.).

Green Fruit Rot