Category Archives: Greenhouse Environment

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 we’ve been … Continue reading

Posted in Greenhouse Environment, Plant production, Ventilation | Tagged , , , , | Leave a comment

It’s “B” Season! Watch for Botrytis, Broad Mite and Burn.

Although native bees and honeybees may just be starting to gather strength and are beginning to fly outside, other “B’s” have been of growing concern in the greenhouse for some time now. These include common spring bedding crop problems like Botrytis cinera (aka grey … Continue reading

Posted in Botrytis, broad mite, diseases, Greenhouse Environment, Spring crops | Tagged , , , , , | Leave a comment

Botrytis Bumming You Out?

With the intense period of rain we just had, and with MORE rain coming on Friday, it’s time to think about Botrytis control and prevention.  One of the most common and destructive diseases of greenhouse crops, outbreaks usually follow periods of … Continue reading

Posted in Botrytis, diseases, Fungal diseases, Fungicides, Greenhouse Environment, Sanitation, Ventilation | Tagged , , , , , | 1 Comment

Improperly ventilated heaters & ethylene damage

Spring is on its way, and with cold nights and warmer days we are seeing a common spring problem – poor air quality damage on spring bedding crops.  Symptoms, solutions and preventative measures are included in this 2017 update to … Continue reading

Posted in Greenhouse Environment | Tagged , , , , | 1 Comment

Stalling out: Strategies for success

Starting to feel a bit bummed out by all this gloomy weather?  Imagine how your poor plants feel!  All clouds and no sun leads to lots of fun with production schedules, nutrition and proper plant development.

Posted in Greenhouse Environment | Tagged , , , , , | Leave a comment

‘Tis the Season for Powdery Mildew; Here’s what Ontario’s Flower Growers can do .

All through the night while the growers were sleeping, spores of Erysiphe, Leveillula, Microsphaera and Sphaerotheca were teeming. Caused by one of these many pathogenic fungi, Powdery Mildew is often white and felt-like to the eye. OMAFRA’s Greenhouse Elves are on … Continue reading

Posted in Fungal diseases, Greenhouse Environment | Tagged , | Leave a comment

Low Light and High Humidity: Identifying Oedema

Oedema or edema, also known as intumescence.  This physiological disorder usually appears during periods of low light – from now through the fall, winter and into the spring.  If you’ve noticed salt-like crystals, odd tumour-like growths or water-soaked spots on … Continue reading

Posted in Climate, Greenhouse Environment, Ventilation | Tagged , , , , , , | 1 Comment