As suspected, it’s turned out to be a heck of year for Poinsettia. Many growers faced Erwinia, others had rooting issues, and all faced significant pressure from Bemisia whitefly from infested cuttings.
As the time approaches for the plants to go out the door, this post covers whitefly control successes/failures in 2018, and what to do with remaining populations.
Whitefly and other poinsettia issues are also being discussed at the Niagara Poinsettia Open House on Tuesday, November 20th. This will take place at Jefferys Greenhouse (Plant II) starting at 10 am. See the latest issue of Greenhouse Canada Magazine for more information (pg. 28). Hope to see many of you there.
Continue reading “2018 Poinsettia Wrap Up: Whitefly and Pesticides”
Thrips tabaci, or Onion thrips. Photo courtesy of Thrips-ID.com.
If you were at the Canadian Greenhouse Conference (or are regularly reading this blog!) you’d know we’ve recently identified Onion thrips as a pest of floriculture crops in Ontario (see this post).
Outside of Ontario? Well, this still may apply to you, as a recent study in France also indicated that up to 47% of pest thrips in floriculture greenhouses were Onion thrips. So, this issue could be wide-spread.
My last post covered the extent of the problem in Ontario’s industry. This post will help you identify if YOU are dealing with Onion thrips (OT) along with Western flower thrips (WFT), and what to do about it.
Up until this point, most of Ontario floriculture growers (and me!) assumed the only pest thrips we were dealing with was Western flower thrips (besides Echinothrips in a few crops like gerbera and poinsettia).
But a survey conducted in major commercial operations in 2016-2017, AND recent outbreaks of serious damage have proved us wrong. (You know what they say about assuming!). Keep reading to find out the truth about thrips! Continue reading “Which Thrips Are in Your Flower Crops: When Paradigms Shift (Part 1)”
If you started out using biological control in your Poinsettia crop this year, you’ve now reached the crucial tipping point for whitefly control decisions.
Based on the size of your whitefly population in mid-late September, your populations could end up too high by November to effectively control. Ultimately, this could affect sales.
So, do you keep going, and hope for the best? Or switch horses mid-stream, and start using chemicals? To help you determine which is the right call, keep reading.
Continue reading “The “Tipping Point” for Whitefly Control in Poinsettia”
Japanese beetle (Popillia japonica) adults were spotted flying on June 29 (2018) in Ontario!
The Japanese beetle season is upon us once again! Adults were spotted this week in Southern Ontario.
Shipping outside Ontario or need to meet the requirements of the JB Certification Program? Not sure what’s required?
This post contains a treatment “decision tree” and a JB product “cheat sheet” to help growers of greenhouse ornamentals.
Continue reading “Japanese beetles are in flight! WHAT and WHEN to spray.”
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.”
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.”