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"Oh dear, it’s oedema"

Oedema, that physiological disorder that appears during periods of low light and high humidity. There’s been quite a bit of it reported in Ontario greenhouses this spring, and unfortunately it’s related to the long rainy (or snowy) spring. If you’ve noticed salt-like crystals, odd tumour-like growths or water-soaked spots on either side of your plant leaves this disorder might be the culprit.

The disorder affects a wide variety of greenhouse ornamentals. It’s usually noticed in spring crops like sweet potato vine (ipomea), geranium, begonia and/or petunia. Tropical plants and succulents are also susceptible as are veggie transplants like peppers and tomatoes. The damage can look similar to thrip or spider-mite feeding damage, but scouting will typically reveal low numbers of these pests (or you may have more than one problem).

Read more at ONfloriculture (Chevonne Carlow)