Phytophthora Dieback, Phytophthora cactorum: The oomycete, or water mold, Phytophthora causes one of the most common disease problems in the landscape for rhododendrons and azaleas.
Disease Cycle: The pathogen belongs to a group of fungi known as water molds that require high levels of moisture and cool temperatures for growth and reproduction.
Damping-off-A complex of water molds (fungi) that attacks seedlings, causing them to wilt and die. These fungal pathogens-Phytophthora, Pythium, and Rhizoctonia-thrive in wet, humid conditions and are the causal agents.
When oxygen is scarce, certain root-rotting fungi such as the aptly named water molds, Pythium and Phytophthora, flourish. And roots stressed by oxygen deprivation are more susceptible to infection by these pathogens.
you water or irrigate and have recently received a substantial amount of rainfall consider suspending that practice for a few days to avoid overwatering. Among other things, overwatered plants are very susceptible to root rots caused by water molds.
 See also: Water, Stage, Blight, Fungi
  
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