gardenlen wrote:
is it powdery mildew terry?

Don't know. I'm plundering the collective wisdom of the group for
someone relatively local(Camden) and will pass on comments.

if so there is a milk spary remedy on our remedies page you could try
need regular applications. also how long have the plants been
producing this is common when they are at the end of their productive
life. also for next season look to the planting position they do
better in well drained situation, and in full sun and lots of air
movent about them.

I think the real problem is basically the three weeks of rainy weather
with very high humidty that we have experienced.

Production is apparently two a week, which they are happy with. Seemed
low to me.