99 Poinsettia Problems: Your Monthly Scouting Guide

Poinsettia Nutrition Infographic

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”

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Now’s the Time for Whitefly Prevention: Registered Products for Poinsettia Dips

OLYMPUS DIGITAL CAMERAHere 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”

Poinsettias: To Spray or Not to Spray, that is the Question

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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”

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.”

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!).”

Lots and Lots of Lewis mites! (And how to go about controlling them in poinsettia).

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Lewis mite.  Photo from University of California.

You know how I just wrote a post on how you need to look out for unprecedented mealybug infestations in your crop this year?  Well I lied!  Now you need to look out for mealybug AND unusually high numbers of Lewis mites!

Read further for what consultants have been seeing out in the greenhouse and for effective control strategies.

Continue reading “Lots and Lots of Lewis mites! (And how to go about controlling them in poinsettia).”

Met52 to be temporarily unavailable

After several months of uncertainty, Monsanto BioAg  will continue to offer Met 52 bioinsecticide.  However, as new sources of inputs are being pursued, the product will not be available between February and October 2016.

This affects both the EC and Granular formulations.

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Met52 comes as a granular (pictured) or emulsifiable concentrate (EC) formula.  Both will be temporarily unavailable in Canada from Feb to Oct 2016.

Met 52 (which contains the beneficial fungus Metarhizium anisopliae) is one of three fungal-based bio-insecticides we have registered in Canada for greenhouse pests such as thrips and whitefly.

During this gap period, growers using Met 52 in their IPM programs may want to switch to products containing the fungus Beauveria bassiana (e.g. BotaniGard 22WP, BioCeres WP).  Beauveria also has activity against thrips and whitefly.  For more details on best use of Beauveria-based products, see this page on the GreehouseIPM.org website.