[2] Identifying Pythium ultimum has traditionally been done by examining oogonia, antheridia, and sporangium structure.
[2] Now, PCR (polymerase chain reaction) technology can identify the pathogen using DNA fragments.
[3] Phytophthora cactorum can be identified by examining oogonia, antheridium, oospore, and sporangia structure.
[2] When conditions are favorable, surviving oospores in the soil produce a sporangia and zoospores which facilitate infection via germ tube.
[1] Zoospores are released from sporangium and blown via wind or rain splash and use free water on the leaf to germinate.
[7] In addition, decontaminating pots, tools, and work surfaces ensures that there are no contamination that could infect healthy plants.
[3] Being careful not to over water, providing good drainage, air circulation, and proper potting media are helpful to prevent zoospores from having an optimal environment to move and infect.
The primary fungicide treatments to control black rot are metalaxyl, fosetyl-AI, and etridiazole that are sprayed onto the plant.