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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What are the diseases that affect Angelica?

I've never grown angelica, or seen anyone else growing it. What diseases should I look for when growing it? How do I cure the disease to make the plant healthy again?
black thumb
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White spots on Ocimum tenuiflorum leaves (chlorosis?)

I'm growing Ocimum tenuiflorum (O. sanctum) from seed. Since 1 week ago, some seedlings have white spots on the leaves. I didn't see any insect or so and the spots look like a “depigmentation” of the leaves. What could it be? What should I do?
kuroneko
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Help to ID tree and determine if it may be diseased

would like to identify this tree and determine whether it is diseased or not. Thanks for any feedback.
user21569
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Is Xanthomonas a host-specific disease?

I grew some volunteer cantaloupes in pots this summer, but they got hit hard by what I believe is Xanthomonas, a bacteria which causes angular leaf spot. I tossed the diseased plants, but I'd like to use the old soil to pot up some pepper plants so…
alexw
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What should I do to prevent plant diseases from spreading while having them live close together?

Is there any good guidelines for how to space plants so that you can prevent plant diseases from being spread between plants, while still having them able to work together in order to pollinate each other? My biggest fear is having one disease…
black thumb
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Spots on marigold leaves

I was sprouting some French marigolds and noticed some spots on the leaves. They didn't look good, especially since one of the plants didn't get them. I looked them out on the internet and figured it was some kind of leaf spot (though I don't know…
Jon
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Small brown scales on my lemon tree

My small lemon tree has been showing these scabs for a while. They are brown, mm sized, and fall off very easily just touching them with a finger or a nail. Examining the soil with a lens I also noted some tiny white mites, but they don't seem to…
DarioP
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Is this Fusarium Wilt or nutrient deficiency or something else?

My basil plants have recently started spotting on the leaves with a couple yellow leaf drops and streaking on stems. Is this a disease or some other issues? Full Gallery of photos A few details: Hardiness Zone 4a to 3a 6 - 8 hours of direct…
Vian Esterhuizen
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Biological degeneration due to inbreeding among plants?

Is there such a thing as biological degeneration due to inbreeding (incest) among garden plants? For instance, if the quality in a bed of calendulas diminishes somewhat year-after-year, could this be due to too such genetic causes, or is soil…
Drux
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My large pine tree is indenting at the bottom of the trunk

My large pine tree is starting to indent near the ground. The bark in some spots can be pulled off easily. The pine tree is the type that branches out. What could the issue be ?
Debra
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What are the white specks on my Strelitzia's leaves?

I have a white fungus on my Strelitzia. It started as little specks on the leaves and I would like to know what it is, what caused it and what will get rid of it.
rené baumann
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Watermelon Disease Identification

I've planted this watermelon 50 days ago, I'm in Zone 8 in Dallas, TX. I'm wondering what the disease that has afflicted the leaves is, and if I should harvest the fruit now and if it's still edible.
brandon
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White stuff on mango not leaves

Hello…My mangoes have this white cotton puffy substance on the fruit but not the leaves. The leaves are nice and healthy looking.It's a strange substance that has two appearances. One looks like tiny white specks sitting on the skin. The other is…
Scott Hellner
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Echiveria Spots Disease?

I got this echiveria a few months ago and its been doing good but ive noticed a few "spots" on it lately and im not sure if this is normal or is it infection, Fungus or disease? one time one of its leaves was being eaten by a slug but ive used bug…
Twurti
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Why are my tomato leaves yellowing?

I'm in Toronto Canada and noticed no fruit set as well as many lower leaves turning yellow. Is this a nitrogen issue? I also noticed an abundance of pillbugs near my plot too, some even eating the lower leaves.
ParthianShotgun
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