Powdery mildew on cut roses in Ontario.
With May’s weather continuing to be up and down, humidity control is a problem in the greenhouse, meaning Powdery Mildew (PM) is too. This pest is rearing it’s ugly head in crops like Kalanchoe and Dahlia.
We won’t cover the basics of PM here: biology, spread and prevention were covered in a previous post. Instead, we’ll focus on monitoring, and which control products to use once you’ve found an infection.
This post was written with help from Plant Pathologist Ann Zemke of the Chase Research Group.
Continue reading “Powdery Mildew Being a Pain? Effective Products for PM Relief.”
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 mold), Broad mites, and leaf burn (from a variety of causes).
Keep reading for tips on how to manage these issues during this time of year.
Continue reading “It’s “B” Season! Watch for Botrytis, Broad Mite and Burn.”
Wilting of a poinsettia plant on a bench of otherwise healthy plants could be Pythium root rot. But then again, it might not…
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 may be considered the most “likely” culprit in Poinsettia in this area, but this isn’t always the case, and misdiagnosis can mean wasted fungicide applications. Read on for a list of likely suspects and appropriate control measures.
Continue reading “Fainting “Freedom Red”? Wilting “Whitestar”? Potential causes of Poinsettia collapse, solutions, and the importance of testing.”
Botrytis spots on Primula petals.
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 cool, damp, cloudy weather. Unfortunately, I can’t order up more sun for you, but I CAN suggest some management tactics.
Continue reading “Botrytis Bumming You Out?”
Impatiens Downy Mildew – an example of a recent threat to Canada’s floriculture industry.
The CFIA is looking for input from growers by April 30th to help develop a national strategy for protecting Canada’s agriculture from new and emerging risks.
Having YOUR voice heard is easy. Read on to learn how to get involved.
Continue reading “How can we best protect Canada’s floriculture industry from pest threats? Have your opinion heard.”
3M Petri Films are an easy to use tool in on-farm water quality testing.
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 get a bit of a taste of the tools to help you do this that have recently been developed by Flowers Canada, the Soil Research Group and other collaborators.
For those of you who are missing my workshop, or want more hands-on, in-depth information on this topic, then come to the “Greenhouse Water Quality Workshop” being run on Feb. 24. Read on for more details.
Continue reading “Workshop on Water Quality Testing next week!”
Rooted Calibrachoa plugs. Photo from jparkers.co.uk
It’s that time of year again, when unrooted cuttings or rooted plug trays of Million Bells (Calibrachoa) are first arriving in the greenhouse.
When they go right, Calibrachoa are a relatively easy, staple spring crop. However, when million bells go bad, they go bad BIG time.
To help your crop turn out this year, Chevonne and I have compiled some info on how to prevent and deal with common issues in Callies.
Continue reading “Managing Million Bells, 2017 Updates”