Identification and Control of Slipper Orchid Leaf Blight

Distribution: GreenhousesCultivatedslipper orchids, mostly seen in the United States. Pathogen: Glomerella cincta. Host: Paphiopedilum. Symptoms: The leaf tip turns brown, then gradually dies from the tip toward the base. Control: Cut off diseased leaves. Spray with 50% carbendazim wettable powder at 600-1000 times dilution or 750 chlorothalonil at 600-800 times dilution. (Chen Xinqi, Ji Zhanhe)