Symptoms - New leaves deveop pocking and small yellow spots. Distortion and burning at edges can occur. Control - Not all anthurium cultivars are sensitive to copper. Many of A. andraeanum used for cut flowers have proven too sensitive for applications from copper containing bactericides. Test each new cultivar in a small plot before starting broadscale use of copper containing products.
Spots turn black and remain wet appearing as they enlarge.
They can encompass the entire flower or leaf under conditions of both high temperature and moisture which are favorable to pathogen development. When conditions become drier or cooler spots dry and can appear papery but usually remain quite dark in color. Phytophthora root rot shows the same symptoms as many other root rot diseases. Leaves wilt, may turn yellow or pale green and eventually die. Plants are frequently stunted and examination of roots reveals their rotted condition.