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Gary Harman

Gary Harman

Professor Emeritus of horticulture/plant pathology at Cornell University, renowned for his research on Trichoderma fungi as beneficial plant symbionts.

Sep 6, 2026

1:06
Can you talk about your early days in that initial discovery? What brought that interest in this specific fungi?
1:14
Started at Colorado State with Edel and Chutt and Tex Baker.
1:19
and went to a meeting and they were talking about protoplast fusion.
1:24
If you want to develop a new variety of plant, you use sexual hybridization.
1:31
But for a fungus, they don't have these, at least the strains we use, have no known sexual strain.
1:38
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.
2:05
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.
4:36
What is the role of trichoderma in the soil microbiome? There
1:43
That's the point.
1:47
It's trichoderma there.
1:48
And so what happens is it's a trichoderma.
1:53
There's a complex interaction with the plant cell membranes that induces the plant to produce disease controlling, active disease controlling properties.
2:10
And these go systemically, and they're quote, transduced throughout the entire plant.
2:18
So, when we started, we thought other things were going on.
2:24
For example, trichoderma is very good at parasitizing other fungi.
3:00
So is it the plant producing antibiotics or something that disease- Well, yeah, they're

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