Gardening and Landscaping Stack Exchange
Gardening and Landscaping Stack Exchange

Questions tagged [diseases]

For questions related to plant diseases.

Plants can be infected by a number of diseases. These can be caused by micro-organisms (e.g. bacteria, fungi, viruses; and multi-cellular creatures such as nematodes).

Macroscopic creatures (e.g. mites and aphids) and water/nutrient problems (too little or too much) can also cause symptoms that can be confused with diseases.

Use this tag for all questions related to diseases - especially diagnosis, management, and cures. Please include pictures of the affected parts of the plants.

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Suspecting pear fireblight but not sure.Any help appreciated

We have several fruit trees in our garden but having fruiting problem only with a pear tree.It is maybe 8 years old, every year has fantastic blossom but after the flowers turn into tiny fruits they suddenly wilt.I suspected it was due to fireblight…
Janko Bradvica
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What is this raised, brown growth on my maple tree?

My tree seems to be infected with something, and every week I notice more leaves have this raised, brown growth. What is it, and how do I treat it?
martin_van_nostrand
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What is wrong with my Hydrangeas

My hydrangeas were looking beautiful until a couple weeks ago. Then I started noticing that some of their leaves had these gray powdery looing spots on them, their blooms started having brown spots and their new leaves have some yellow ones. I…
Claire
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What is this disease on the growing tips of my peppers, and how can I control it?

Please have a look at these images of my hot pepper plant. Notice the growing tips which seem withered and diseased. What disease is this and what is causing this? What are the solutions to counter this? Location: India. Weather In May-June: Hot! >…
gatul
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What are these raised brown sections on the backs of the leaves on my pear tree?

I have this brown stuff growing on all the leaves on my pear tree in my garden. Does anyone know what this is? I think it might be some plant disease. Does anyone have any advice on fixing this?
X0r0N
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Is this the cucumber mosaic virus?

We tried growing cucumbers in our backyard near San Francisco, California for the first time this year and have had all sorts of problems. We had to remove three cucumber plants because they seemed to have some sort of disease that we thought was…
Daanii
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What is this disease on my Basil?

I've planted Basil (from a pot) outside and it's been very wet in the last few weeks. The plant has now got these grey spots on it. What is wrong with it?
Chris S
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Dracaena Massangeana: Leaf spots on new growth

Over the course of the past week I noticed spots developing on some of the new leaves. These start as faint yellow halos and seem to develop a brown core quickly over the course of a few days. The brown part is ~5 mm in diameter, while the halo can…
kettlepot
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Problems with fairy castles cactus

My beloved fairy castles cactus has been suffering for a while and I was wondering what could be happening now. It looks like having several different problems... specially worried as it looks fragile all over, with those remarkables dark areas at…
user21392
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Can I propagate a healthy plant from one that has a White root rot disease?

I have three Dracaena fragrans house plants that were propagated form another large plant. I've found that two of them have White root rot disease. (The plant that did not have the fungus was the topmost cutting.) Can I propagate healthy plants from…
user18849
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Why are some of my pumpkin plants wilting, and showing what looks like stem rot?

Up to this date we have had a healthy crop of about 500 flowering pumpkin plants, however, over the last 3 days we have lost maybe 20 of them. They will simply wilt over 24hrs and then die: Closer inspection shows that the base of the stem is…
Lamar Latrell
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Root rot in Pseudotsuga

Friends of mine have a grove of 5 fairly closely spaced Pseudotsuga menziesii (Douglas fir) in their front yards which are about 15 years old. They are thinking about girdling the smallest to produce a wildlife snag but are worried about root rot…
Ben
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What is the white residue spreading across my dracaena and how do I treat it?

I have a white residue spreading across my dracaena at home. I tried wiping it with wet sponge when it was on one leaf only but its come back and spreading across now 50% of the plant. Some of the leaves are turning brown as well. The white residue…
Mobbie Nazir
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What is this tomato disease?

I showed it at my local garden center, but they said its normal for old leaves. But I think its some disease, as the new growth also gets similar blackening of leaves within weeks. This only happens to leaves that are in touch with other infected…
Anonymous
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Indoor Peace Lily soil suddenly covered in white spots

My 3 year old peace lily has been in this clear pot for almost a year and within the last few weeks these spots began appearing near the roots and now cover the soil on the top layer. The spots are in clusters and are greenish-white. The peace lily…
JLF
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