Mark Your Calendar: the next Annual Oregon Orchid Show & Sale is September 24-25, 2022 in Portland, OR


Bacterial infections in orchids are most often secondary infections. In other words, another problem such as fungal rot has affected the plant and has made it susceptable to bacterial rot. The most common bacterial symptom orchids have is a mushy, liquidification of the pseudobulb or leaf. There isn’t really any treatment for bacterial infection in an orchid. Since bacteria only lives in the affected part of the plant, simply removing the affected part of the plant is the best course of action if the other part of the plant is still salvagable. Always sterilize your cutting tools after using them on an orchid – especially if it is an infected one.

Treatment Details Indoors?
Physan 20, Phytan 27 and Hydrogen Peroxide Treat bacteria by removing the infected part(s) of the plant. Always sterilize your cutting tools after you do this to avoid cross contamination. If biting insects, such as scale, aphids or fungus gnats, are present be sure to treat for these as well since they are likely to spread bacteria from plant to plant. Treating with a bactericide such as Phyton 27 or Physan 20 will not treat an infected plant but can be used as a preventative. It should be utilized to prevent spread of bacteria after removing infected parts of plants. Some say that Physan 20 actually strips the beneficial protective layer of the orchid’s leaves, making them MORE susceptible to bacteria (and other disease). The recommendation is to use Physan 20 only on the roots of the plant (and to sterilize your cutting equipment) but on foliage to use a 30% hydrogen peroxide solution on the leaves. Safe indoors.