Apple Alert: Blossom Blight Infection: April 18-19

— Written By

The risk of a blossom blight infection event is HIGH for Polk County (NC) for Wednesday April 18 and Thursday April 19. Due to the rain amount on Sunday (>2.5 inches in several areas), if a bactericide application was made prior Sunday, do not assume blossoms are still protected. Although some weather stations in Henderson County (NC) are predicting a High risk for an infection event (according to the Infection Potential/EIP model), bacterial populations on the stigmatic surface of flowers are low and a streptomycin or other bactericide application is probably not necessary.

  • High Risk: If there are open blossoms in your block, a high risk of a blossom blight infection event means that 2 of 3 requirements (see Bloom Disease Update )are satisfied for blossom blight to occur. A preventative streptomycin or other bactericide application should be considered prior to a wetting period (dew or precipitation).

For a list of registered products for blossom blight control, please refer to the NCSU Fire Blight fact sheet or to the 2018 Integrated Orchard Management Guide for Commercial Apples in the Southeast.