Mycosis-- orchid wilt

Orchid wilt (Orchid Fusarium wilt) [also known as Paphiopedilum wilt (Paphiopedilum wilt)]

Distribution: almost worldwide.

Pathogens: Fusarium oxysPorum, Fusarium oxysPorum f. Cattleyae.

Hosts: Cartland (Cattleya), Cymbidium (Orchid), Dendrobium (Dendrobium), Paphiopedilum (Aristolochia), Phalaenopsis (Phalaenopsis), Vanilla (Vanilla), etc.

Symptoms: mainly infect the rhizome, making it purple, the conducting tissue becomes pink-purple, and it can also be extended to pseudobulbs and roots. The leaves turned gray due to clogged ducts, and the plants withered and died. Phalaenopsis infected with this disease is often accompanied by root and stem rot.

Prevention and treatment: remove diseased plants and soil with bacteria, and spray, soak or irrigate the soil with 50% carbendazim or 50% carbendazim wettable powder 500 times. 0.5% formalin can also be used. (Chen Xinqi, Ji Zhanhe)