Oh dear! It’s Oedema.

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Oedema on the young leaves in this begonia basket.

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 we’ve been having.  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. Continue reading “Oh dear! It’s Oedema.”

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Summer School: Lessons learned from another hot, humid Ontario summer

Happy first day of fall! It was a dry, sweltering summer across Ontario, and I’ve heard from some growers that it was the most challenging summer they could recall in recent memory based on the heat alone.  Oppressive heat and humidity pack a punch that leaves everyone feeling sluggish – you, your staff and your plants.  While we won’t complain too loudly (winter’s coming!), learning from this year’s challenges will help in summers to come as we experience more extreme weather. Continue reading “Summer School: Lessons learned from another hot, humid Ontario summer”