Category Archives: Fungal diseases

Fainting “Freedom Red”? Wilting “Whitestar”? Potential causes of Poinsettia collapse, solutions, and the importance of testing.

From now until mid-November is when you’ll most likely see plant losses in poinsettia due to severe wilting. These losses can be considerable: anywhere from 2-15% in Niagara operations in past years, with disease pressure seeming especially high this year. Pythium … Continue reading

Posted in biopesticides, diseases, Fungal diseases, Fungicides, Poinsettia, Pythium, Thielaviopsis | Tagged , , , , , | 1 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 , , , , , | Leave a comment

Workshop on Water Quality Testing next week!

Want to know when and where pathogen problems are building BEFORE they start? Interested in setting up your own water quality testing program that’s both easy and cost effective? For those of you attending my IPM Workshop on Friday, you’ll … Continue reading

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‘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

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Two new fungicide registrations!

That’s right!  As of today, flower growers have 2 new weapons against fungal diseases at their disposal. Heritage MAXX (azoxystrobin) and Medallion (fludioxonil) are now registered for use in outdoor and greenhouse ornamentals. Heritage (a Group 11 fungicide) is a systemic fungicide, … Continue reading

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