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Old May 3, 2016   #16
bower
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Location: Newfoundland, Canada
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Way to tell leaf mold from grey mold: with leaf mold (Fulvia fulva) the spores are on the underside of the leaf and the top of the leaf is randomly yellow. Grey mold will go right through the leaf and grey on both top and bottom, and it likes stems as much as leaves.

Grey mold can be a problem whether warm or cold, as long as it's humid or wet.

Leaf mold is very dependent on high temperatures and humidity. It doesn't need actually wet surfaces to germinate, humidity is enough. Spores are often windblown and if so you can sometimes see where it came from, from the pattern of disease on one side or other of the plants or of the greenhouse/tunnel where the wind blew.

Grey mold can be curbed by pruning it out - bleached pruners of course. Better air circulation helps a lot, but some varieties are more susceptible and in a bad season may be better to remove the worst affected.
Leaf mold is a real scourge, you can't prune it out to control it. But if the temperatures drop before the plants are completely defoliated they will recover. If you do try to do some pruning/sanitation it should be before dusk, which is when they release their spores from the telltale underside of the leaf.
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