Aphids which are causing fungal disease by the look of it. What's the air flow like in your greenhouse!
k_stuart,
Nov 30, 6:41am
Better now. We recently installed automatic opening windows once the temp reaches a certain degrees but yes these were infected before that.
stevee6,
Nov 30, 6:49am
That sort of thing is always a pain. Imo clean everything out of the greenhouse and clean it to within an inch of it's life. Get new plants and see how they go this time.
maclad,
Nov 30, 7:21pm
A heavy insect infestation which causes a secondary infection called sooty mould. It grows on the sticky secretions deposited by the aphids and numerous other insects. Spraying with an oil a few times should clear it up. Add insecticide should you choose to.
milkybar4,
Nov 29, 5:10pm
this what it looks like to me too. i have it sometimes cause over crowded organic garden
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