Step can generally last for 2-4 days without rain. As it is degradable by sun light, it lasts longer in over cast days than in sunny days. Rain can wash some off but at least strep is more systemic than other antibiotics such as tetracycline. However, as it does not penetrate into unopened flowers, you would still need to consider putting done another application again 2 days later to make sure the newly opened flowers are protected by strep if the prediction models suggest a high disease pressure in your region.
Quan Quan Zeng, PhD Assistant Scientist & Bacteriologist Department of Plant Pathology & Ecology The Connecticut Agricultural Experiment Station 123 Huntington Street, P.O. Box 1106 New Haven, Connecticut 06504 phone: 203-974-8613 ________________________________ From: apple-crop <apple-crop-boun...@virtualorchard.com> on behalf of kellyorchards <kellyorcha...@gmail.com> Sent: Sunday, May 21, 2017 12:14:15 PM To: Apple-Crop Subject: [Apple-Crop] Fireblight How long will strep protect blossoms that were open at the time of application? Art Kelly Kelly Orchards Acton, Maine _______________________________________________ apple-crop mailing list firstname.lastname@example.org http://virtualorchard.com/mailman/listinfo/apple-crop