Timing and careful material selection are critical in prune bloom disease management. Franz Niederholzer (UCCE Colusa & Sutter-Yuba Counties) discusses strategies for managing prune bloom diseases.
2017 Prune Fungicide & Efficacy Timing Tables (see PDF pages 60-61) http://ipm.ucanr.edu/PDF/PMG/fungicideefficacytiming.pdf
Sac Valley Orchards blog on brown rot bloom and twig blight: http://www.sacvalleyorchards.com/prunes/brown-rot-blossom-and-twig-blight/
UC IPM for Prune: http://ipm.ucanr.edu/PMG/selectnewpest.prune.html
Mention of a pesticide does not constitute a pesticide recommendation. Always follow the pesticide label.
Thanks to the Pistachio Board of California and Almond Board of California for their generous financial support. Music by Muriel Gordon.