Your Yearly Reminder of Japanese Beetle Requirements: Get Those Treatments on Before May 15!

Anyone following this blog for the last few years knows I like to remind y’all to make sure you treat your plants for Japanese beetle before May 15! This is because NO pesticides are allowed when Japanese beetle (JB) pupae are present (generally, May 15-June 15 in Ontario),which has gotten some growers into a pickle during spring shipping in the past.

Note that if you’re a nursery crop grower also treating for boxtree moth, you may surpass the maximum allowed applications or rate of Acelepryn per year if you also need to treat for JB. In that case, it might be better to time your treatments for JB in order to use intercept (imidacloprid) instead. So make sure to check out the pesticide timing chart in the JB Infographic in the full post.

This year, I’ve updated the JB Decision Tree and Infographic to include shipping requirements to different areas in the United States. So, if you or your staff need more clarification on any of these points, make sure download the latest PDF.

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March, 2026 DLI Report

*An overcast day in Niagara Falls, Canada. Photo by A Glimpse of Canada*.

(Originally published on ONgreenhousevegetables.ca on April 14, 2026 by Fadi Al-Daoud)

Welcome to the Vineland DLI report for March, 2026!

So far, March looks like it’s off to a bit of a dreary start in Niagara, with the average DLI in Vineland only a smidge above February.

Read on for the detailed data report and more information about our DLI data collection project.

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A Grower’s Guide to On-Farm Trials

*An on-farm trial comparing different brands, types and colours of sticky traps done by OMAFA.*

This is a guest post written by Jessie deHaan (M.Sc.; Research Technician, Biological Crop Protection at Vineland Research and Innovation Centre).

Now that it’s halfway through spring bedding plant season, you may be considering changing some of your current IPM or production practices for next year that just aren’t working as well as they could. Conducting on-farm trials is an easy way to evaluate how well a new product, process or technology will work in your operation.

Before making any large-scale changes, it is important to test things on a small scale first. Read on to learn how you would go implementing a small on-farm trial to get you results that are meaningful.

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Upcoming Greenhouse, Nursery & Floriculture Biosecurity Workshop in March

OSCIA is offering a free two-part webinar will explore practical steps growers can take to strengthen biosecurity in greenhouse and plant production operations.

A technical expert will highlight key practices that help reduce risk and protect plant health.

Participants will also learn about potential cost-share opportunities and will receive a Greenhouse Biosecurity workbook to help develop a biosecurity plan.

Workshop details

Tuesday, March 24, 2026 – 7:00 to 9:00 PM
Tuesday, March 31, 2026 – 7:00 to 9:00 PM

Participation in both sessions is required.

Growers can register here:
https://workshops.osciaportal.org/workshop/registration/48?workshopEventId=2225

To help with planning, we encourage participants to register by March 17.

Questions can be directed to Jenn Nash, East Central Region Field Representative. You can reach her at 705-991-3909 or jnash@ontariosoilcrop.org

Controlling Parvispinus, Oleander Aphid and Spider Mites in Mandevilla: Part 2 – Spider Mite Resistance Management.

Last week, I posted an updated IPM plan for Mandevilla that balances Thrips parvispinus (“Parvi”) control while taking into consideration other pests, as well as costs. The last post covered propagation in detail, including biocontrols and chemicals.

This week I’ll be going over the best way to balance control of Thrips parvispinus (“Parvi”) and two-spotted spider mite (TSSM) in production. I’ll provide a working Parvi spray program that gives you high-quality plants by sale, but also makes sure spider mites don’t walk away with your crop (or your wallet!).

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How To Manage Parvispinus, Oleander Aphid and Spider Mites Effectively in Mandevilla: Part 1 – Propagation.

When Thrips parvispinus first came on the scene in Ontario, our one goal was to knock back this pest any way we could. Four years later, we are suffering the effects of an all-chemical program. This includes high costs, along with insecticide resistance developing in two-spotted spider mite, which used to be managed biologically before Parvipsinus came along.

Based on OMAFA’s work with commercial farms, along with input from technical reps from biocontrol companies, we’ve come up with a more refined IPM program for Mandevilla that balances Parvispinus control while taking into consideration other pests, as well as costs.

I’ll be going over this program in detail over a 3 part series, so buckle up!

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Join our LAST Thrips Identification Workshop on March 4th in SIMCOE!

As control measures differ depending on the thrips species you’re dealing with, the very FIRST step in learning how to manage thrips effectively is proper species identification.

If you’re interested in having someone in your greenhouse operation learn how to do this (so you don’t have to rely on technical reps or government specialists), then keep reading!

This will be our LAST in-person workshop, so make sure to take advantage of this free learning opportunity!

Read on for more details and how to register.

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Biostimulants Part 1: What Are They and What Can They Do?

Ontario greenhouse growers are increasingly experimenting with biostimulants to potentially boost plant quality. Used correctly, these products could help cut fertilizer costs, improve stress tolerance, and enhance overall crop quality.

However, using these products without the knowledge of different categories of biostimulants, and sufficient in house trialing, can waste your time and money.

In this first post of this two-part series, we will discuss what biostimulants are, the different categories they fall into, and first steps for choosing a product to trial. In the second post (coming soon!), we’ll discuss important tips for choosing a biostimulant, as well as potential drawbacks and, most importantly, how to trial this on your own farm for YOUR crop.

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DLI Data – January, 2026

Welcome to the Vineland DLI report for January, 2026!

In January, 2026, Vineland received 50% more light than in December, 2025.

Read on for the detailed data report and more information about our DLI data collection project.

Continue reading →

REMINDER: GrowON Webinar Feb 11th at Noon: Managing Mealybugs

A reminder that on Wednesday, February 11th, GrowON will host Dr. Raymond Cloyd of Kansas State University, for an hour-long exploration of mealybugs and their management.

To attend, click on the registration link in the webinar poster or at the end of the post.

Webinar Description

Who: Dr. Raymond Cloyd, Professor, Kansas State University

What: Mealybugs are a challenge to manage in greenhouse production systems. In this webinar, Dr. Raymond Cloyd (Kansas State University) will discuss the biology, behavior, and feeding damage affiliated with mealybugs. He will then address plant protection/pest management strategies, including cultural, physical, insecticidal, and biological that greenhouse producers can implement to keep mealybug populations below plant damaging levels.

When: Wednesday, February 11th, 12-1pm EST (11-12 CST)

Where: on Zoom. (The recording will also be made available on the ONFloriculture blog at a later date). Please register for this FREE webinar using this link.

More Info: Questions regarding the webinar can be directed to sarah.jandricic@ontario.ca.