Quote:
Originally Posted by Ray
This is a nice idea, but diseases are awfully difficult to diagnose by visual inspection alone, as many look quite similar. Not to mention that what looks like a disease might be a response to some cultural issue.
One misdiagnosis, for example, is attributing dead, black tips on new growths to a fungal infection, when in fact it is due to a deficiency in calcium. Sure, fungi can grow on necrotic tissue, but a fungicide won't fix it.
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I suspect a lot of people attribute black areas to calcium deficiency when they are actually fungal infection.