Updated greenhouse pest control guides add biopesticide guidance, product changes
MSU Extension updates greenhouse pest and disease guides. Explore the new products, biopesticide guidance and resistance management strategies that have been added for 2026.
Key takeaways
- MSU Extension updated its greenhouse pest and disease management guides for 2026 based on ongoing efficacy trials.
- The insect guide now includes expanded product tables and a new section on biopesticides for preventative use.
- Disease management guidance emphasizes fungicide rotation by FRAC code to reduce resistance risk.
Michigan State University Extension (MSU Extension) has released updated 2026 guides for greenhouse insect and disease management, incorporating new product data and expanded guidance on prevention and resistance strategies.
The insect management guide includes labeled products for common pests while emphasizing sanitation, exclusion, scouting and resistance management to help growers build prevention-based programs. Updated tables reflect current product labels and chemistries, and the list of products for cutting dip applications has been expanded. A new section on biopesticides outlines how these products differ from conventional insecticides and are most effective when used preventatively.
For disease management, the updated guide rates fungicides from A+ to B/B- based on efficacy trials. Products rated “A” are recommended under high disease pressure, while a broader range may be used in lower-risk conditions. The update adds Avelyo (mefentrifluconazole, FRAC code 3) to the A+ category for powdery mildew control.
MSU Extension plant pathologist Mary Hausbeck said fungicide rotation by FRAC code remains critical to avoid resistance. Using products with different modes of action reduces the risk of control failure over time.
Additional guidance is included for greenhouse vegetables and herbs, with product listings by crop, pathogen and label restrictions. The updates reflect ongoing research trials conducted by MSU Extension specialists and collaborators.
Visit the MSU Extension Floriculture & Greenhouse Crop Production website to download the updated management guides.
FAQ
Q: What is new in the insect management guide?
A: It includes updated product tables, expanded cutting dip options and a new section on biopesticides.
Q: How are fungicides rated in the disease guide?
A: Products are graded from A+ to B/B- based on efficacy in trials.
Q: What new product was added for disease control?
A: Avelyo was added to the A+ category for powdery mildew.
Q: Why are FRAC codes important?
A: They identify fungicide modes of action and help guide rotation to prevent resistance.
Photo by Heidi Lindberg, MSU Extension.