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Category: Diseases
Expert
09:11AM, 22 Oct 2009
Pauline
Ornamental grape vine with red mottling in the green leaves in summer then turn dry and brown.

Leaves were magnificent first year, second and third year dreadful. Looked at similar pictures on internet and was most like the one with the potassium deficiency. Nothing visible on surface of leaves, using a magnifying glass and seems to be within the leaf itself. I am in south east queensland and soil is black cracking clay. Growth of the vine seems vigorous. Thought it might be a fungus problem as well. If it is potassium deficiency, how much and how often should I apply it, and when should I start? Some leaves are just starting to appear.

Submitted: 07:01PM, 21 Jul 2017
Answer: Hi Pauline,

Thanks for contacting Yates.

Potassium issues can be seen in the grape leaves with the discoloration around the edges of the leaves. Without a photo of what has occurred with your particular plant it is difficult for me to say for certain that this may be the cause.

What I would recommend though is to give it a good feed and to check the pH in the soil as well. You can get a kit from your local hardware store or nursery to do this. A pH of around 6.5 is ideal.

During the growing period give the plant regular feeds with Yates Thrive All Purpose Soluble Fertiliser. This product will help promote strong leaf growth and give it a good dose of the potassium as well.

If in the spring the leaves are showing these signs again, please let us know and send us a photo so we can look into it further for you.

Kind regards

Stephanie
Yates Horticulturalist

Answered: 02:31PM, 22 Jul 2017

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