Efficacy and Timing of Application of Fungicides, Biofungicides, Host-Plant Defense Inducers, and Fertilizer to Control Phytophthora Root Rot of Flowering Dogwood in Simulated Flooding Conditions in Container Production

• DOI: 10.1094/pdis-02-22-0437-re
• Publication Date: 2022-05-21T03:52:25Z
• Authors: Krishna Neupane; Bhawana Ghimire; Fulya Baysal-Gurel
• Keywords: Phytophthora cinnamomi; Root rot

Phytophthora root rot, caused by cinnamomi Rands, is one of the major diseases flowering dogwood (Cornus florida L.). The severity rot disease increases when plants are exposed to flooding conditions. A study was conducted determine efficacy and timing application different fungicides, biofungicides, host-plant defense inducers, fertilizer manage in month-old seedlings simulated events for 1, 3, 7 days. Preventative treatments were drench applied 3 weeks 1 week before whereas curative 24 h after flooding. Dogwood inoculated with P. days Plant height width recorded at beginning end study. At study, plant total weight assessed using a scale 0 100%. Root samples plated PARPH-V8 medium percent recovery pathogen. Empress Intrinsic, Pageant Segovis, Subdue MAXX, as preventative applications, able suppress compared control all durations. All treatments, exception Stargus Orkestra Intrinsic application, 1-day event. Aliette ON-Gard effective first trial preventatively both but not second trial. Signature Xtra application. Interface findings this will help nursery growers understand performance time intervals repeated applications