Bemisia whitefly (Bemisia tabaca) adults on poinsettia. In high pressure years, poinsettia plants can quickly become unsellable due to this pest.
The floriculture industry in Ontario seems to have mostly avoided heavy aphid AND thrips pressure this spring/summer. But from everything I’ve been hearing, we are NOT going to be that lucky with whitefly on poinsettia this year.
This post goes over preventative measures that should be taken as soon as cuttings come in the door, biocontrol programs for whitefly on poinsettia, and WHEN and WHAT to spray for this so you can avoid resistance issues.
Continue reading “Worried About Whitefly? Control Strategies in Poinsettia for 2018.”
IPM in potted mums can be challenging at times, but Ontario has lots of strategies for thrips control in this crop.
New to a thrips biological control program for chrysanthemums, or just need a refresher on the most effective strategies currently being used in the industry? Then watching the Greenhouse Canada Webinar, “Tips for Thrips Control: From Propagation to Pocketbook” is a good place to start.
Keep reading for the webinar link and some chrsysanthemum IPM tips for 2018.
Continue reading “May IPM Refresher: Effectively Controlling Thrips in Mums”
Navigating the guidelines for exporting plant material out of a Japanese Beetle (JB) zone such as Ontario can be tricky business, especially with upcoming changes to the Greenhouse-Grown Plant Certification Program (GCP; formerly CGCP).
Also not helping is the general lack of information out there regarding proper timing of JB control products. For example, did you know that NO products are considered effective between May 15 and June 15? This could create problems if you’re shipping outside Ontario in the next month and haven’t treated yet.
To make things easier, I’ve created a treatment “decision tree” and a JB product “cheat sheet” for growers of greenhouse ornamentals.
Continue reading “Exporting to a JB-free Zone? Proper Pesticide Timing for Japanese Beetle Control in Ontario.”
Weekly-mum producers have seen higher-than-normal spider mite levels coming in on cuttings from the U.S. recently. This might impact seasonal potted-mum growers as well.
Here’s some tips and tricks on two spotted spider mite control within a chrysanthemum IPM program.
Continue reading “LOOK OUT! Here comes the Spider Man! (Oops. I mean Mites. Spider mites. Sorry; way less exciting).”
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.”
How are YOU controlling your Echinothrips? (Photo by Entocare NL).
Echinothrips americanus is an interesting pest in Ontario. An occasional pest of little concern for some, its presence often plagues others (i.e. cut flower growers). The greenhouse research team at Wageningen University & Research has been working to find reliable, effective biocontrol strategies for this Echinothrips.
Read on for their latest update on what’s working, and how this applies to Canadian growers.
Continue reading “Controlling Echinothrips in Ornamentals without Pesticides: News from the Netherlands.”
An Entomologist by training, it generally takes a lot to gross me out. (I’m constantly suppressing shrieks of “It’s adorable!” when growers show me aphids). But now that it’s dark and wet in the greenhouse, there’s been a sudden appearance of a rather unlovable pest some growers have been referring to as “Pot Worm”.
Not an actual worm at all, this pest is a lover of over-watering and fungal production. Read on to find out what it REALLY is, and how to control it.
Continue reading “When a Worm Isn’t a Worm at All: “Pot Worms” – A Special Kind of Gross.”