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.

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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.

Funding ALERT: Market Diversification and Trade Resiliency Initiative

Intake for the Market Diversification and Trade Resiliency Initiative is from February 17 – March 17, 2026

To learn more about the initiative, continue reading or attend one of the upcoming information webinars linked below.

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Upcoming GrowON Webinar Feb 11th: Managing Mealybugs

Mealybugs, which have long plagued tropical plants, are now appearing in a wider variety of crops, from chrysanthemums to poinsettia. On Wednesday, February 11th, please join Dr. Raymond Cloyd of Kansas State University, for an hour-long exploration of mealybugs and their management.

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

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Information on Health Canada’s Pesticide Compliance Program: What You Need to Know

Heath Canada’s Pesticide Compliance Program (PCP) is responsible for promoting safe use of chemicals, as well as monitoring and enforcement, to make sure registered fungicides, insecticides and other agricultural chemicals are used according with their legal label.

As several greenhouses (both vegetable and ornamental) have undergone random inspections in 2025, it’s good to be aware of this federal program, and what an inspection could look like.

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REMINDER: GrowON Webinar TOMORROW – Thriving in Containers: Key Factors Affecting Plant Health in Ornamentals

In this hour long session, Ryan Munroe of NVK Nurseries will share practical tips for monitoring plant health and explain how media properties can influence irrigation, pH, and rooting.

Continue reading to register with the link below and join us from 1:00 – 2:15pm on January 21st for this virtual session.

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