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🎬 Free course

What you don't see

This course begins where "Recognising pests and diseases" ends – take that one first. The diagnosis course sorts what you can see; this one catches what falls through: the root beneath the substrate, the viroid inside the tissue, the decomposer after the harvest. Instead of a symptom picture you need a different question – does what I see fit what I know? Four lessons on causes without a picture and the three ways to prove them anyway.

1

The safety net

The switch sorts what you can see. This course catches what falls through it – if "the switch" means nothing to you, start with the diagnosis course.
2

Beneath the substrate

The root works in the dark. What goes wrong down there, you see up top – and it looks like something else.
3

Inside the tissue

Some pathogens never show themselves. And the numbers circulating about them are a lesson of their own.
4

After the harvest

There's nothing left to diagnose here – only to prevent. In exchange, for the first time you hold everything in your hands.