Hydrangeas with mealybug
Hydrangeas with mealybug
I love hydrangeas but this year I have white fungal stuff on stems and underside of leaves. I sprayed with oil and then tried white vinegar but maybe my timing was wrong. When should I spray and when do I prune?
From the images you supplied, it looks like it could be a sap-sucking insect called cottony hydrangea scale or mealybug - both can be difficult to remove.
Spray the infected plants with horticultural oil, applied at the winter rate. Be fastidious when applying, paying particular attention to the base of branches and the underside of leaves to ensure you coat the insects well. Repeat the application two weeks later.
Continue to check the plant (and other plants close by) to ensure reinfestation hasn’t occurred. If the problem persists, talk to your local garden centre about a suitable insecticide.
To reduce reinfection next year, when pruning your hydrangeas in late winter/early spring, carefully collect all leaves and branches and remove them from the garden.
Do not prune hydrangeas too early (eg: late autumn/early winter), because if there is a warm spell, already pruned plants will suddenly spout new leaves. This burst of energy means that the plant has less "stored vigour” and therefore new growth and flowering will be considerably reduced.
More like this
Sooty Mould on Lemon Trees
My lemon tree is covered in this black sooty like stuff? What is it and how do I get rid of it?
Sooty Mould on Lemon Tree
What is wrong with my poor lemon tree and what can I do about it? It looks terrible!
Attack of Mealy Bug
I bought a plant from a local shop and about a week later it looked like fluffy cotton dots all over it and then the leaves started to die. What is it and how do I treat it?
White Sticky Bug
I seem to get a white sticky bug quite often on my moth orchids that I have inside. What can I use to get rid of it and to stop it from reoccurring?
Tackling Thrips on Shrubs & Trees
Over the last couple of months, most of my trees have been getting strange rusty coloured leaves, whereas before they were green. This includes a magnolia tree and a bay leaf tree - even though they are not close together. Can you tell me what it is, and how I can fix it?
Lemon Tree Pests
I love my lemon tree but always seem to get this black blight over the lemons. How can I best deal with this?
How do I get rid of the black fungi looking growth all over my lemon tree? Lovely lemons but the tree gets covered and so does the fruit. It washes off but looks terrible and is a concern.
Thrips on Portugeuse laurel hedge
Some parts of my Portuguese laurels hedge have thrips. What can I do to get rid of them as I don't want it to spread.
How to care for white bush roses
We have just moved and have the most beautiful white bush roses. We’ve never had roses and would love some tips on how to keep them healthy.
How to Grow Roses
Please can you outline a spraying schedule for roses. Each year I’ve used Shield and Super Shield and still the leaves look awful. Do I need to look at a winter clean up?