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u/Human-Bee5217

Image 1 — Yellow mottling on leaves, what could be the cause?
Image 2 — Yellow mottling on leaves, what could be the cause?
Image 3 — Yellow mottling on leaves, what could be the cause?
Image 4 — Yellow mottling on leaves, what could be the cause?
▲ 2 r/Pelargonium

Yellow mottling on leaves, what could be the cause?

This yellow mottling has started appearing on some of the pelargoniums I'm caring for. It doesn't look like the usual yellowing I'd expect. It's not accompanied by any dry or crispy edges or browning.

Can anyone suggest possible causes? I'm wondering if over or under watering could be it. Or a particular pest damage or disease? Or a nutrient deficiency, but they've all been fed once a week with the same multi purpose soluble feed. They're in a heated glasshouse and get watered a few times a week.

u/Human-Bee5217 — 4 days ago