Why is the bottom of the leaves sticky

Question

#CathedralWindows I just bought this beautiful girl yesterday and I don’t know much about her but I noticed that on a few leaves underneath is beading with sticky sap like clear stuff

@OutgoingBanana · Answer

That means you might have pests

@OutgoingBanana · Answer

You need to get a sticky fly trap and watch closely for any semblance of flys. You also need to isolate your plant as to not spread any pests

@Linx · Answer

@MockingJay , my caletheas seems to be doing this from time to time, too. 🤔

Do you maybe know why?

I don't have pests, and I see it most in my round leafed calatheas 🤔

Could it be an air flow issue?

The ones that have been hit the hardest here are my 3 dotties in the kitchen, by a window that is never opened 🤔

@MockingJay · Answer

@Linx I am not completly sure why they do this. But I have figured some plants do it even if they have no pests🤷‍♀️
I think it is some form of regulation of the minerals the plant has in its system, and releases excess sugars or salts through the leaves. In some form of edema.

I have heard some plants actually do it to attract ants (when it is sugary), which again will help repel other harmful pests to the plant (but it sounds a little weird to me)🤷‍♀️ 
I know my orchids and some roses release sugary sap when they get too dry. Although I have heard orchids might do it when it gets a little cooler too, so I guess it could have something to do with temperature or airflow/drafts as you say @Linx for the calatheas too🤔

@BuffCaperspurge · Answer

@MockingJay olive trees donthis as well.  Just an FYI for an olive tree parents out there.  Sap is normal to these in nature but not so much for us

Why is the bottom of the leaves sticky

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