If the fungi spores happen to land on an orchid leaf, they quickly penetrate and begin the disease process that produces brown spots.
Canadian Orchid Congress Web site. Susan Jones was the editor of Awards Quarterly and assistant editor of Orchids. In mature plants, the disease can strike at any point on the plant (leaves, pseudobulbs or roots), but often starts in new leaves or growing leads, and progresses downward through the plant until reaching the roots.. For more advanced cases, a systemic fungicide such as Aliette or Subdue is more effective.
Try searching for something else or go back to the first page with all the articles. Reprinted from the OCTOBER 2002 issue of Orchids -- The Bulletin of the American Orchid Society. This site uses Akismet to reduce spam. However, leaf spotting can also signify a bacterial or fungal disease.
Destroy an orchid if you see wet, dark spots on the leaves and pseudobulbs, as they usually indicate a bacterial or fungal disease, such as black rot or brown spot. By providing minimum conditions required by the orchids; By keeping the orchid in a healthy state; By proper fertilization.
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Orchids have a reputation for being fussy and hard to grow but they are simple once you know a few basic rules. The addition of a fan or fans to the growing area can improve the airflow and help prevent rots. At this point, the fungus develops a vegetative part or mycelium consisting of hyphae (thin, thread-like tubes), which spread quickly through the affected plant tissues. Black spots on orchid leaves could mean one of three things: (1) the orchid was bruised during transport or handling, (2) the leaves have had access to more sunlight then they require, or (3) bacteria has infected the leaf. By providing minimum conditions required by the orchids;
Bud Blast. As it name implies, black rot shows up as dark blackish spots or lesions on the affected plant part. Before making a purchase inspect leaves for reddish-brown to black spots.
Destroy an orchid if you see wet, dark spots on the leaves and pseudobulbs, as they usually indicate a bacterial or fungal disease, such as black rot or brown spot… At first signs of infection, segregate all affected plants to avoid contaminating healthy plants. Reduce the frequency of fertilizing to once or twice a month if you notice the tips of leaves turning brown, as this indicates root burn. But most orchids should enjoy filtered light, 40 to 60 percent humidity and a weekly application of diluted fertilizer. Fungi in the water source or in water left standing in the drip dish may cause black spots on orchid leaves.
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