Horizontal black streaks on cattleya leaves
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Brazilan cattles and others, Bela Vista list for Tamiami pre order Horizontal black streaks on cattleya leaves
 
 
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Old 06-24-2023, 08:57 PM
MateoinLosAngeles MateoinLosAngeles is offline
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Default Horizontal black streaks on cattleya leaves
Someone on Facebook was asking what this could be. The pattern confused me and made me think it might be something nutritional rather than fungal. Apparently, these black streaks appeared seemingly overnight on all growths. The grower says it's not sunburn. He waters weekly, about 60ppm N and he has hard water. Room conditions 18-25C 45% humidity. The plant is Bc. Mem vida lee 'limelight'.

Not sure about the orientation of the light, but he's a windowsill grower.

Any ideas of what this might be? Does it warrant a systemic fungicide treatment?
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