S01:E08
“Mite Watch: Spider Mite Management Secrets from 45 Years in the Greenhouse with Dr. Lance Osborne”
What do you get when you combine 45 years of greenhouse research, a PhD on whiteflies, and an unstoppable curiosity about every tiny creature crawling through Florida’s ornamental industry? You get Dr. Lance Osborne—one of the true icons of greenhouse pest management.
In this episode, Dr. Ping Yu sits down with her former colleague at the University of Florida’s Mid-Florida Research and Education Center (MREC) to dig deep into the world of spider mites. From their rapid life cycles and sneaky dispersal tactics to the “six-bullet” chemical rotation strategy and the power of predatory mites like californicus and persimilis, Lance brings decades of field-tested wisdom that every grower can put to work. Along the way, you’ll hear why sticky cards are useless for mites (use beans instead!), how banker plants revolutionize biocontrol, and why the best career advice from a 45-year veteran starts with “be a pain in the ass” and ends with building trust.
Plus: Lance reveals his newest excitement—discovering unknown natural enemies of mealybugs by hiding plants in the bushes and seeing what shows up. That’s real plant power in action!
Listen Time: ~50:46
Consulte las Notas del Programa
“Spider mites were the most sprayed pests in ornamentals nationwide… So that was a logical place to start in trying to develop an IPM program.” — Dr. Lance Osborne
“It’s like a gun. You’ve only got six bullets.” — Dr. Lance Osborne, on chemical rotation strategy
“Let them be your scouts. Let them run around and look for spider mites.” — Dr. Lance Osborne, on releasing predatory mites preventively
“You don’t BS people in this industry because if they’re still in business, they’re probably smarter than I am.” — Dr. Lance Osborne
“Something’s eating them all.” — Dr. Lance Osborne, on the mystery of why mealybugs disappear outdoors
Spider Mite Life Cycle Five developmental stages: egg → larva → protonymph → deutonymph → adult. Each immature stage has a feeding phase and a resting/molting phase. A complete generation can occur in as little as two weeks under warm conditions, making rapid population growth a constant threat in greenhouses.
Why Scouting Beats Sticky Cards for Mites Unlike whiteflies and thrips, spider mites don’t fly and won’t reliably land on sticky traps. Instead, use indicator plants (lima beans work well—mites love them and damage shows quickly) and direct leaf inspection with a quality 10–20x hand lens.
The Chemical Rotation Dilemma Spider mites develop localized pesticide resistance rapidly. Lance recommends limiting rotation to 3–4 modes of action rather than 5–6, because every additional chemistry increases the chance of including one the local population is already resistant to—creating a gap that allows the population to rebound.
Biocontrol Pairing Strategy Neoseiulus californicus is the generalist “workhorse”—release preventively to establish a resident population that scouts for mites and survives on alternative food sources. Phytoseiulus persimilis is the specialist “knockout punch”—deploy into heavy infestations for rapid population reduction. Combining both provides the best results.
Banker Plants A system where non-crop plants maintain populations of beneficial organisms in the greenhouse year-round. For spider mites, banker plants support predatory mites and Feltiella midges even when pest populations are low, providing continuous biological surveillance.
Translaminar vs. Systemic Activity Many modern miticides are translaminar—they penetrate through the leaf to reach mites feeding on the underside. A few, like Kontos (spirotetramat), are systemic. However, good physical spray coverage remains essential; don’t rely solely on the chemistry to reach the target.
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🌻 AFE Resources — Mites & Insect Pests: In addition to the resources and information our guest shared in this episode, AFE has additional resources for mites and other insect pests that can be found on AFE’s website at endowment.org. Whether you’re dealing with spider mites, whiteflies, thrips, or other greenhouse pests, AFE’s research library is a valuable starting point for science-based management strategies.
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Funding & Acknowledgment: This episode in our first season is made possible through an educational grant from the American Floral Endowment, whose research priorities helped shape the topics that are featured. To learn more about AFE and access their research and educational resources, visit their website at endowment.org.
Blooms and Beyond is a podcast that covers plant history, culture, and management through the lens of science. Whether you’re a commercial grower looking for management solutions, a student exploring horticulture careers, or someone who just loves plants and their stories, you’ll find something here for you. Hosted by Dr. Ping Yu from the University of Georgia, each episode features interviews with experts who bring enchanting stories, pioneering research, and practical wisdom from the world of horticulture.
Your Takeaway: When you walk away from each episode, commercial professionals should have at least one piece of advice to help with production, and plant enthusiasts should have one cool fact to share about plants. Because that’s how we spread plant power to a larger audience and make the environment a little bit better.
Host: Dr. Ping Yu Guest: Dr. Lance Osborne, Mid-Florida Research and Education Center (MREC), University of Florida Production: University of Georgia Center for Urban Agriculture Producer: Rich Braman Support: American Floral Endowment Educational Grant (2025–2026)
AFE-Sponsored Episode: This is one of five AFE-sponsored episodes in Season 1, with topics shaped by AFE’s research priorities. Spanish translation of show notes available.
Episode Release Date: February 15th, 2026 Episode Length: 50:46
“Till next time, stay healthy and go plants!” 🌱🌻🌿