
Gary Harman
Professor Emeritus of horticulture/plant pathology at Cornell University, renowned for his research on Trichoderma fungi as beneficial plant symbionts.
2
APPEARANCES
2
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Sep 6, 2026
The Symbiotic Relationship Between Trichoderma and Plants - Gardening Beyond Basics 86
1:31
1:38
2:05
D
1:06Diego FooterHOST
Can you talk about your early days in that initial discovery? What brought that interest in this specific fungi?

Gary HarmanGUEST
But for a fungus, they don't have these, at least the strains we use, have no known sexual strain.

Gary HarmanGUEST
So there is a process whereby you can dissolve away the cell walls and fuse them and Then you get, it became a very interesting exercise that the, there were huge diversity introduced that way.

Gary HarmanGUEST
And when we select, we went through, I don't know, thousands of strains and we finally selected T22 because, and this is a really important concept, it's rhizosphere competence.
How Trichoderma Helps Fight Disease
1:53
2:10

Gary HarmanGUEST
There's a complex interaction with the plant cell membranes that induces the plant to produce disease controlling, active disease controlling properties.

Gary HarmanGUEST
And these go systemically, and they're quote, transduced throughout the entire plant.
D
3:00Diego FooterHOST
So is it the plant producing antibiotics or something that disease- Well, yeah, they're