Episode 161: The Secret Lives of Pathogens with Dr. Zamir Punja
In this episode, Tad Hussey sits down with the "Godfather of Cannabis Pathology," Dr. Zamir Punja, Professor of Plant Pathology and Biotechnology at Simon Fraser University. Dr. Punja shares groundbreaking research from 2024 and 2025 that challenges everything we thought we knew about bud rot, viroids, and the internal microbiome of the cannabis plant. We dive deep into the riskiest time week for contracting Botrytis, the surprising discovery of mycorrhizae inside seeds, and a brand-new 2026 observation regarding how cannabis plants "expel" excess salts and silica through their leaf hairs. If you’ve ever struggled with late-stage mold or wondered how HLVd really spreads, this scientific deep-dive is a must-listen.
Cannabis Cultivation and Science Podcast · KIS Organics, Tad Hussey, Dr. Zamir Punja
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Show Notes
Key Takeaways for Cultivators
The Week 3 Strategy: Preventive sprays for Botrytis must occur when the flowers are still small and "open." Once the bud swells (Weeks 6+), the pathogen is already locked inside.
Airflow is Everything: Buds act as heat sinks. Use fans 24/7 to cool the internal temperature of the flower, which is significantly higher than your room’s ambient temperature.
Identify Your Mold: If your bud rot looks pink or white rather than grey, it may be Fusarium. This is a systemic issue that requires a different mitigation strategy and poses a mycotoxin risk.
HLVd Survival: In living soil, HLVd may break down much faster than on sterile surfaces because the microbes decompose the host root tissue.
Watch the Silica: Over-applying potassium silicate can cause the plant to excrete white crystals onto the leaves and stems—don't mistake this "silica vomit" for PM or resin!
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