Bacterial and Fungal Disease Orchids

Bacteria Rot As suggested by the name these bacteria rot is caused by bacteria, mainly Erwinea and Pseudomonas. They mainly affect Phalaenopsis within the warmer months when both temperatures and humidity are high. Bacteria rot often starts as small water-soaked spots on the leaf that quickly become fluid filled areas. It can kill a whole plant within a variety of days if not addressed quickly. Rot caused by Erwinea will have a very foul odor. 

To Treat Bacterial Disease To treat bacterial rot, use a sterile knife and cut the leaf off below the infected area, ensuring to not traverse the infected tissue. If the infected area has reached the crown of the plant, it's presumably too late to save lots of it and therefore the plant should be discarded. After removing the diseased tissue it might be known to spray the infected plant (and those around it) with a bactericide like Captan, Dithane M-45 , SA-20 and Physan

Fungal Root Diseases Black Rot plant disease is the main fungal rot affecting orchids. Cattleyas seem to be particularly susceptible. Plant disease starts as black spots/lesions on infected tissue and may affect any part of the plant, but usually affects young leaves and shoots. The spots/ lesions grow quickly and may rapidly spread throughout the plant. 

Fusarium is another fungal disease that affects a good range of orchids.

It mainly enters through the roots affecting the rhizome first before spreading throughout the plant.

A tell-tale sign of this pathogen may be a distinct purple halo on the outer edges of the rhizome once you traverse it. On Phalaenopsis, early symptoms are observed as yellowing at the very base of the leaves by the stem. this might quickly blacken and therefore the leaves will drop. Rhizoctonia 

Rhizoctoniaplant disease is especially related to old, rotting potting media or damage caused by over-fertilization. It infects the plant roots causing them to travel brown and decay. 

To Treat Fungal Root Diseases Treatment involves completely removing the old media from the roots, and well as any dead/decaying root matter, drenching the plant with a systemic fungicide and repotting in clean, fresh media.

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