Worried About Whitefly? Control Strategies in Poinsettia for 2018.

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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.”

May IPM Refresher: Effectively Controlling Thrips in Mums

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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”

Christmas in July: tips for controlling whitefly in poinsettia. (Hint – start now!).

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Juvenile and adult Bemisia whitefly (Bemisia tabaci).  There are 2 biotypes of this pest (“B” and “Q”) which look identical; however, their response to chemicals is very different.

Poinsettias cuttings are here! Unfortunately, they will likely arrive with unwanted “presents” in tow.  This includes Bemisia whitefly, a pest that can be hard to control with natural enemies and can ALSO be resistant to pesticides.  So what’s a grower to do?  

By implementing some preventative measures RIGHT NOW, and understanding WHEN it’s appropriate to spray, you can help save yourself a lot of headaches later.

Continue reading “Christmas in July: tips for controlling whitefly in poinsettia. (Hint – start now!).”

Mealybugs…on poinsettia??

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Citrus mealybug feeding on a flower stem.

Last year several consultants and I noticed something strange.  A number of greenhouses in Ontario had noticeable infestations of mealybug in their poinsettia crop.  This was the first time many in their 25+ year careers had seen this (e.g. see Mel Sawaya’s article in Greenhouse Canada Magazine).

It’s unclear yet if phenomenon will repeat itself this year (or perhaps affect even more operations), but growers should be on the lookout for this pest. Keep reading for more information about the potential cause of these mealybug infestations, and possible solutions.

Continue reading “Mealybugs…on poinsettia??”

Pests on Points: head off problems now!

Many of you will be getting in your poinsettia cuttings a few short weeks from now.  Why not head off whitefly issues as soon as the points come in the door? 

Whitefly on poinsettia.

Whitefly on poinsettia. Photo by Graeme Murphy.

Drs. Rose Buitenhuis and Michael Brownbridge of the Vineland Research and Innovation Centre put on their thinking caps and came up with an elegant solution to prophylactically treat the whitefly that inevitably come in with poinsettia cuttings. By dipping cuttings  in reduced-risk insecticidal products (BotaniGard, horticultural oils) before sticking, whitefly populations can be reduced in the crop by over 70%. And, because the dip materials are “soft” pest control products, you can (and should) begin your biocontrol program immediately.  Dips should be effective against both biotypes Bemisia (aka silverleaf whitefly), as well as greenhouse whitefly.

For more details on products, proceedures and rates, click here: http://www.flowerscanadagrowers.com/uploads