is this powdery mildew?

[neomantra]

I have been looking at different threads and also found this: http://www.uvm.edu/extension/cropsoil/wp-content/uploads/PowderyMildew.pdf.

It doesn't seem to look exactly the same though. Is this likely to be mildew? Or something else?

Underside of some leaves:

On the actual bines:

 

[theredben]

No, that is not Powdery Mildew. Looks like maybe bird poop, or slime leftover from a slug walking across your plants.

Nothing to worry about.

 

[neomantra]

Definitely not bird poop as it mostly appears on the underside of leaves. I haven't seen any slugs but that doesn't mean they aren't around I guess. Good to know it's not mildew though, thanks.

 

[sweetcell]

the white webbing is making me think mealybugs

http://smallnotebook.org/2008/06/30/plant-pests-bugs-in-disguise/ (see #3 for a pic)
http://howto.yellow.co.nz/home-garden/garden-and-outdoors/how-to-kill-mealy-bugs/

 

[neomantra]

That seems like a good possibility. Fortunately the treatments (spraying with a hose, wiping it off, spraying with soapy water) overlaps pretty well with what I was doing to deal with what seemed to be an aphid issue as well. It's hard to tell 100% whether the aphids are gone since the leaves were already damaged by them, but I see no more traces of this white gunk shown in the picture anymore. Also, cones seem to be growing.