Trees and Shrubs : Pests and Diseases
1 - 6 of 260 answer(s)
Magnolia buds being eaten
Magnolia buds being eaten?
Daria, Westport, Co Mayo Posted: 10/01/2017
Unclear in the photo you sne, the most likely explanation is the damage was done by snails in the autumn and not noticed until more recently. The damage is unusual and slight, too little to affect the flower show.
Black spots in sycamore leaves
I make leaf mould every year. The leaves are mainly sycamore and have black spots. When planting a new Acer earlier this year I applied some of the leaf mold. Will this have an adverse effect on the Acer? Can I continue to make leaf mould with leaves that have the black spots?
Inish, Fanad, Co Donegal Posted: 03/11/2016
That is called tar spot...affects only sycamore. Good hot compost breakdown will kill spores.
Japanese acers have their own leaf spots, not as common fortunately.
Ailing Crab Apple Tree
My Red Sentinel Crab Apple tree has a problem with its leaves since June, it has very few fruits and they are small and scabby. Its blossom was fine in the spring. I checked its ties and it's not strangled. The apple tree next to it is fine with a wonderful crop of apples. I did not summer prune it as I was afraid of doing more damage. Any ideas?
Maire Liz, Carbury, Co Kildare Posted: 10/10/2016
It sounds like it has apple scab disease when comes with damp conditions.
It is not possible or effective to spray.
Try applying some high-potash fertiliser, such as sulphate of potash, or tree and shrubs fertiliser, in spring to harden the tissue against fungal disease.
Not all apple varieties get apple scab.
dieback on white Abutilon
Are they sensitive to fertiliser ? I cant remember very well, but chances are l included slow release fertiliser in the hole.
I ve grown a few white abutilons from seed. Planted them out in June when quite large plants growing in about a 12 litre pot. Watered well. Ground prepared well. Even though they re in different locations, both of them have withered leaves, any ideas ?
Bloemtje, Waterford, Co Waterford Posted: 27/09/2016
This is probably die-back caused by fungal disease, such as grey mould, the plants being predisposed by being soft and too well fed, and located in damp stagnant air.
Plant friendly wall & fence cleaning
I have a courtyard garden with shrubs and perennials planted up against its painted fences and masonry walls. The hard surfaces are discoloured by algal and some moss growth.Will you recommend a proprietary cleaner that I might spray onto these surfaces? It must not be too deleterious to plants as it is inevitable that there will be some overspray due to the positioning of the planting.
dmc101, Kircubbin, Co Down Posted: 26/09/2016
Most algicides can affect plants. Read the product details. Perhaps apply by roller. Apply when the majority of plants are leafless.
Problems with Hydrangea
I have a red hydrangea which normally blooms well. This year however, it has not done at all well. At the moment, it has a whitish mildew on many of the leaves, also it seems to have spider web in many of the leaf clusters with myriad little white mites in the webs and the flowers are almost all decaying without having fully bloomed. Can you please advise on problem and any possible solution.
Culloville, Skerries, Co Dublin Posted: 12/09/2016
While it is unusual to have red spider mites attack and outdoor plant, especially in rainy weather, it is not impossible in a sheltered garden. It possibly also have mildew.
Watch it in spring and if it shows signs of these problems, spary it with a rose spray in April.