Please Help: Whta's happening to my vine?

[Karen Atkinson]

This is a picture of my lovely old vine. It has thrown up seemingly diseased shoots as well as healthy ones. Hope the pictures can be accessed.


http://s1230.photobucket.com/albums/ee485/kasm98/?action=view&current=DieBack1.jpg


http://s1230.photobucket.com/albums/ee485/kasm98/?action=view&current=DieBack2.jpg


Its leaves are also showing some kind of discouloration and mottling:

http://s1230.photobucket.com/albums/ee485/kasm98/?action=view&current=DieBack3.jpg

[Karen Atkinson]

[Digeroo]

Have  you mulched it with anything?

[Karen Atkinson]

No, it's in the greenhouse...its roots must go very deep though as it's very old. There was been fabulous grapes on it last year

[goodlife]

Hmm..generally it doesn't look bad...just those brown bits...could it be frost?..did you have window open during the cold nights?
Then again..the last leaf looks like something else is wrong... :-\
Have you applied any fertilizer this spring?..if so, did you water it in..? ...I'm thinking of fertilizer scorch.. :-\

[Karen Atkinson]

nope..no fertislizer...I wondered if it was dieback?..whatever that is??....it is looking worse than the picture depicts

[antipodes]

in google images, search for Grapevine diseases - there are some pictures that look a lot like yours, it says Downy Mildew. Perhaps you have a fungal disease there? Do you treat with Bordeaux Mixture?

[petengade]

Could it be red spider mite? look on underside of the leaf with a magnifying glass and look for web and the mites

[Karen Atkinson]

no..am I supposed to treat with Bordeaux mixture? (am new to vine growing)..Is it too late to do it now?   no sign of red spider mite

[goodlife]

No, there is no need for spraying unless you know the plant is suffering with fungal problems.
Are those dead brown tops 'crispy' dead? Not 'limp and wet dead' ?
I'm still thinking of scorch..it just looks like it..but there is also high temperature scorch..not just chemical..and looking at your photos all effected parts seem to be the young soft growth that would be more tender and worst effected.
I had look the common problems with grape vine..and scorch is one of those..
"often being seen as dry, papery buff or brown areas. Wilting may occur if the plant is losing more water than it can take up, due either to excessive transpiration or dry soil condititions...excessively high temperatures or the rapid onset of high temperature immediately following cool weather."...sort of what we've experienced recently.
Did you do ample watering and forgot/didn't open door and windows in your GH lately or during last hot spell...?
Fungal problems would show presence of white powdery or furry growth on leaves,,and it is not quite the time of the year for those sort of problems to show up yet.. :-\

[Karen Atkinson]

yes crispy dead...I will go and look again tomorrow