Pop quiz! Three problems I kinda have guesses about, but would like confirmation on, are below. Remember to show your work.
Problem #1 of 3: Pelargonium
At work, we got many, many geranium (Pelargonium spp.) plugs in a couple weeks ago. We potted them up, set them on the tables, and then found them, not too much later, developing weird patterns of spots, sending everybody momentarily into panic mode, and leading to a scene something like this:
(watch fast -- I don't expect Youtube to leave this up long.)
Like this, of course, only in a very loose fashion, obviously.
Anyway. Leaves were collected and sent to Iowa State for pathology testing, but it may take a while before we hear anything, so I'm hoping to scoop Iowa State and get an answer first by harnessing the power of Teh Mighty Internets. So here, then, is what the leaves look like:
The spots don't appear to be spreading, and don't seem to be on new growth.
The leading theories are, or have been:
2) Chemical damage, from using pesticides in the greenhouse too soon after a traumatic shipping and repotting experience.
3) Cold temperatures and/or water droplets standing on leaves for too long.
4) Bacterial disease!
We're open to other possibilities, of course. Anybody who's seen this before, please say something in the comments.
Problem #2 of 3: Begonia
We had a bunch of Begonia rex-cultorum all go nuts at once, too. I concede that they hadn't been getting treated all that well, because of the rearrangement of the greenhouse for the annuals and vegetables. We had them in a spot that could have been too hot and dry, though they'd been okay there for a few weeks before this happened. They were getting watered from overhead, but then, they always were. They might have been getting too much water, but it's hard to tell. This particular leaf is the clearest example I could find of the problem, but they all look more or less like this:
What does this look like to you?
Problem #3 of 3: Hedera canariensis
We got in either six or twelve hanging baskets of non-variegated Hedera canariensis in December, and they all did fine for a long time. This is the only plant left, and it's suddenly gotten really weird. In some places, the leaves have turned reddish between the veins --
and in other places, the leaves have gotten crispy edges --
Searches for spider mites were negative. We have other plants of the same species in the greenhouse, quite a few of them, and this is the only one that's doing this. I have a definite guess here, but I'm looking for confirmation.
Comments are set so that you can leave answers anonymously, or under a name of your choosing. I appreciate anybody who's stopped by to read this, whether you have any guesses or not.