The Effect of Applied Salinity and Water Stress on Chemical Suppression of Phytophthora ramorum from Soilborne Inoculum in Rhododendron

• Published in: Plant disease Vol. 105; no. 10; p. 2929
• Main Authors: Bostock, Richard M, Roubtsova, Tatiana V
• Format: Journal Article
• Language: English
• Published: United States 01.10.2021
• Subjects: Dehydration; Phytophthora; Plant Diseases - prevention & control; Rhododendron; Salinity; mandipropamid; fosetyl-Al; cryptic infections; Subdue Maxx; Aliette; predisposition; Micora; mefenoxam
• ISSN: 0191-2917
• DOI: 10.1094/PDIS-09-20-1928-RE

A serious concern for nurseries is the potential for and other species to colonize roots without inducing aboveground symptoms in plants that then serve as cryptic reservoirs of inoculum. Episodic abiotic stresses that reduce plant water potential can compromise the host resistance to trigger disease development from root and crown infections during many plant interactions. We conducted a series of experiments with root-inoculated plants in a potting soil mix to assess the influence of excess salt or water deficit on ramorum blight development and the potential for these abiotic stresses to affect the efficacy of oomycete-suppressive chemical soil treatments. During growth chamber trials, colonized roots of both nonsalt-treated and salt-treated plants. However, salt treatment offset the benefit realized from soil treatment with mefanoxam (Subdue Maxx) and mandipropamid (Micora), as evidenced by the enhanced pathogen colonization of roots. A 3-week episode of water stress imposed after chemical treatment but before inoculation eliminated protection against root colonization conferred by fosetyl-Al (Aliette). At an outdoor experimental nursery, foliar symptoms were apparent in 23% of root-inoculated plants during two trials and absent during one trial. However, the majority of inoculated plants in all trials had colonized roots with little or no aboveground symptoms. A single application of Subdue Maxx or Aliette reduced root colonization by in plants. Although salt stress did not enhance ramorum blight symptom expression at the nursery, salt partially offset protection from root colonization obtained by Subdue Maxx.