I've just found this:
http://www.penberthplants.co.uk/protea-compost

It would be interesting to see if your Proteas get the leaf blackening
in their compost. Penberth appear to grow a number of Proteacaea. As
they are near Penzance, it might be worth asking them if they have any
idea what your protea leaf problem is.

--

Jeff

On 26/06/2017 08:37, Chris Hogg wrote:
it probably wasn't a fungal
disease. She suggested either a phytophthora

Phytopthora _is_ a fungal infection.

Andy

On 26/06/17 21:36, Vir Campestris wrote:
On 26/06/2017 08:37, Chris Hogg wrote:
it probably wasn't a fungal
disease. She suggested either a phytophthora

Phytopthora _is_ a fungal infection.

Andy

https://en.wikipedia.org/wiki/Phytop...gi_resemblance

--

Jeff

In article , lid
says...

On 26/06/2017 08:37, Chris Hogg wrote:
it probably wasn't a fungal
disease. She suggested either a phytophthora

Phytopthora _is_ a fungal infection.

Andy

Not quite

http://forestphytophthoras.org/phytophthora-basics

"Phytophthora (pronounced Fy-TOFF-thor-uh) is a genus of
microorganisms in the Stramenopile kingdom which includes water molds,
diatoms and brown algae. Phytophthora species resemble true fungi
because they grow by means of fine filaments, called hyphae, and produce
spores. But unlike true fungi, their cell walls contain cellulose
instead of chitin, their hyphae lack cross-walls, and the diploid phase,
rather than the haploid phase, dominates their life cycle. Another
striking feature of Phytophthora is that it produces swimming spores,
called zoospores, during one phase of its life cycle, a vestige of its
evolutionary origins in water.

There are currently more than 80 described species of Phytophthora
worldwide, and the vast majority of them are plant pathogens. The name
Phytophthora is derived from Greek and literally means ?plant
destroyer.?

Janet