This is a joint post on poinsettia issues by Drs. Chevonne Dayboll and Sarah Jandricic.
Okay, so Poinsettia don’t really get that many problems. But when issues arise, they can hit a crop fast and hard. Whitefly, Lewis mite, root rots, and nutritional issues can all quickly derail a quality crop.
Here’s a month by month guide on what you should be looking for to prevent small problems from becoming big issues.
Continue reading “99 Poinsettia Problems: Your Monthly Scouting Guide”
Here in Canada, we’ve been talking for years about research on the highly effective method of dipping your poinsettia cuttings in low-risk pesticides to reduce starting whitefly populations.
Thanks to Dr. Rose Buitenhuis (VRIC), Cary Gates (FCO) and BioWorks, the label for BotaniGard WP has now officially been expanded to include dip applications. This now adds to our arsenal (see below for more dip products).
Read on for the current BotaniGard label and how dipping can help improve your Bemisia whitefly program this year, whether you’re using pesticides or biocontrol.
Continue reading “Now’s the Time for Whitefly Prevention: Registered Products for Poinsettia Dips”
T’is poinsettia sticking season once again, and the question always comes down to the same thing: do I use chemicals to control Bemisia whitefly and hope it works this year? Or do I switch to biological control? Here we show some head to head comparisons that can help you decide.
Continue reading “Poinsettias: To Spray or Not to Spray, that is the Question”
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”
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”
Now that poinsettias are safely tucked into their prop trays and the threat of Erwinia (Pectobacterium) is almost over, it’s time to think about other Poinsettia issues.
Root rots, nutritional issues, environmental stress and PGR mistakes can all be costly in this high-value crop. Read on for common pitfalls and how to avoid them.
Continue reading “Poinsettia Prep Refresher”
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.”