I’m growing in a greenhouse in the pacific northwest; we had warm weather, then a bout of cold, and now hot again. My humidity runs very high; I do have a fan to push air out the roof vents when above 85, but nothing to control humidity (kind of a lost cause up here anyway…cigars stay at 70% even when the humidor sponge is dry!).
I have several plants in buckets, all doing fine, and several in a raised bed. They have all grown like CRAZY (side topic: can I top or bend over the tops to stop growth? They’re growing out the roof vents at 7-feet-plus…). They are also mixed in with tomato plants, and one little auto-flower is definitely shielded from good sun and pretty short (4’). It is easy to miss this plant, and today I noticed it was about half covered in a grayish-white substance that reminds me a lot of tent caterpillars/web worms, except it’s not a web. I’m guessing mold or mildew, but don’t know for sure. I’ll add photos below.
Not being sure what it is, I tried searching the archives but didn’t find much; apologies for adding a new topic that is probably a repeat of previous ones!
In any case, I carefully cut out all of the plant that was affected (roughly 50%) and made sure not to touch other plants with it or shake, etc.
Any help much appreciated–I’m pretty concerned that this could take down the whole greenhouse!
Next year there will be a lot more space between plants…