Which Pesticides are Effective for Whitefly?

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Whitefly – especially Bemisa whitefly – are STILL one of the hardest insects to control with pesticides in the greenhouse industry,

Efficacy trials are key to keeping growers informed about which chemicals currently work and which don’t for Bemisia whitefly. 

Entomologists at the University of Maryland and Delaware recently did such a study, and included newer pesticide registrations. If you missed the article in the July issue of Grower Talks magazine, keep reading for the link to their results and a Canadian take on the study.

 

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Garden Mums – 2019 Production and Protection Tips

This post was contributed to by Drs. Sarah Jandricic and Chevonne Dayboll.

Summer is in full swing, and so too are garden mums.  As you get ready for the next few months, here are a few tips to keep your crop on track.

Drip line irrigation can be a more efficient way of delivering water and nutrients to outdoor crops.

Irrigation method matters!

There are plenty of options for irrigation in potted outdoor crops, but not all are created equal if you are trying to maximize your water efficiency.  Overhead irrigation by boom, or sprinkler is not efficient if your pots are not spaced tightly.  Canopy sizes in the later months of production may make this impossible, especially if you choose to go with final spacing when pots first move outside.  These methods of irrigation can also lead to pots that are too dry (not watered) or too wet (over watered). Plants can only use water that makes it into the pot, so low volume drip line or tape is a more effective way to delivering usable water to your outdoor crops.

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99 Poinsettia Problems: Your Monthly Scouting Guide

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This post on poinsettia problems was contributed to 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.

 

 

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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.

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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.

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New Virus in Greenhouse Crops: Important Info Sessions Available Tues and Thurs

ToBRFV is a new virus on the greenhouse scene.

A new, potentially serious plant virus – the Tomato Brown Rugose Fruit Virus – is moving through crops across Europe and the U.S.  As this virus can affect both tomatoes, peppers, and potentially some floral hosts, OMAFRA is running information workshops in Niagara and Leamington to answer grower questions about potential threats to our industry.

Read on for a description of the virus and workshop dates.

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2018 Poinsettia Wrap Up: Whitefly and Pesticides

Bemisia 4_SJAs 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.

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