Orchid Diseases - Erwinia Soft Rot on orchids | Saving orchids

Описание: Between all orchid diseases erwinia soft rot is one of the hardest to eradicate. So,today we are talking again about saving orchids. Orchid diseases may be difficult to diagnose, and erwinia soft rot on orchids is not an exception. Erwinia soft rot is a serious orchid disease, a bacterial infection which can kill your orchid in a matter of a few days.
The symptoms are:
Small water-soaked spots appear on the leaves and often are surrounded by yellow halos. If unchecked, the infection will rapidly rot the leaves and roots and spread more slowly into the rhizomes or pseudobulbs. This wet rot may have a foul odor and has a water soaked appearance.
Phalaenopsis. Disease spreads so rapidly that plants may be completely rotted in 2 to 3 days. The bacteria are opportunistic organisms that can enter through wounds.
Dendrobium. Leaves appear yellow and water-soaked and become black and sunken. My dendrobium nobile has rotten away it's new growths in 2 days.
Vanda. Leaves develop translucent patches which become black and sunken.
Paphiopedilum. Leaves develop small, round spots often near the middle of the leaf. The spots are initially yellow and water-soaked but eventually become reddish brown and sunken. The spot enlarges in all directions and may reach the growing crown before the leaf tip is affected. If untreated, the disease quickly spreads throughout the plant, leaving it a dark, shriveled mass.
Grammatophyllum. Leaves have water-soaked, browning spots which become black and sunken.

Treatment:
Immediately remove infected tissue using a sterile instrument, spray bactericides containing quaternary ammonium products like Physan or copper compounds on infected and adjacent plants following label instructions (copper should not be used on dendrobiums or blooming plants), or apply the home remedy of hydrogen peroxide. Disinfect growing area with 10% bleach solution. Treat nearby plants as well as those that are diseased.

Prevention:
The disease is spread by splashing water so avoid overhead watering if the disease is present. The pathogen favors hot and moist conditions, so if infection occurs, keep leaves dry, increase air circulation and reduce temperature and humidity (if possible). Periodic preventive sprays with copper compounds help to prevent infection, particularly during hot and humid weather (do not apply copper to dendrobiums). Always follow label instructions.
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Please watch: "Orchids In Bloom & In Spike - October 2018"
   • Orchids In Bloom & In Spike - October 2018  
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