Where fire blight is expected to be a problem, the first spray is made after blossoms open when weather conditions favorable for the disease are present or predicted within 24 hours. Must be absorbed by the blossoms to be effective, should not be applied just before or during rain. The frequency of repeat applications depends on weather, blossom opening and disease pressure. Routine use of streptomycin to control shoot blight is not recommended. However, application within 24 hours after the beginning of a hail storm is recommended for fire blight-threatened orchards.
Thorough coverage is essential for control.
Application of streptomycin at concentration greater than 6X is not recommended. Restricted entry interval 4 hours. Preharvest interval 50 days . Liquid formulation with the equivalent of 4.32 pounds phosphorus acid per gallon. Foliar application for the control of Phytophthora spp.