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Questions tagged [diseases]

For questions related to plant diseases.

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Apple tree concerns

I purchased a house with an apple tree, maybe 15' tall and 6" in diameter. The tree has two longer branches and I was wondering how to go about trimming them. If anyone can tell me where to make the ...
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1answer
17 views

What cactus' disease is this?

My sister has this cactus with those brown spots in it. It does not seem to be spreading, or if it is, is very slowly. Does anyone know what it is so we can treat it?
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Why is my marigold drooping

Just a couple of hours ago my marigold was fine, the next time I saw it.... It had its leaves dropping, soil dry but the flowers were fine. The two leaves at the beginning of the stem are starting to ...
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Sansevieria disease

Anyone know what is happening to this sansevieria?
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1answer
33 views

What disease is this (tomato plants)?

I got these seedlings that i re-potted. The bigger leaves get white/yellow spots and the baby leaves go dark as they sprout and wilt very fast. I have a few varieties in small containers that seem to ...
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1answer
15 views

White stuff in citronella plant?

What is this white stuff in citronella plant and how can I remove it? It looks like a type of insect. Both of my citronella plants have that. Is it contagious? I started spraying it today with soap ...
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1answer
51 views

What are these things on my apple tree?

I have recently bought an orchard. And one of my trees has these things on its bark. Is these some kind of infection? is it important and what should I do about it?
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1answer
21 views

Crippled nectarine tree leaves

Not sure what's causing this crippling on the leaves of nectarine leaves. Please help. Zone:9 (northern California)
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1answer
33 views

Is something wrong with my ZZ plant?

This morning I looked over my ZZ plant and saw these white spots underneath some of the leaves. The best match I could find is something called powdery mildew. Is it that or is it something else?
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Cherry tree fungus

I’ve got a cherry tree of some variety (at least, I think that’s what it is). Last winter, some black fungus clusters started forming on some of the branches. I figured I should snip them all off the ...
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29 views

Purple edge on black berry leaves

Hi, I recently bought a blackberry plant (Navaho) and was wondering if any one can help me work out what's going on with it. It has purple edges on all the leaves, one or two have larger purple ...
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1answer
26 views

Pale green areas in new leaves of Draceana fragrans, disease?

Does anyone know whats wrong with my draceana? All the new leaves have those "pale green" areas, they have it already in the beginning. I´m familiar with the common pests and they are not the cause. ...
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What is wrong with my hibiscus?

enter image description here The growth on this little tree seems much slower than it's sibling. The leaves appear to be growing very misshapen and start to curl under. It's almost as if it's being ...
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1answer
34 views

White spots on cactus

I’m fairly new to gardening but purchased some cactus’ last year. I noticed one started to develop a white spot on the side of it. I isolated this cactus into its own pot. Any idea’s what it is or ...
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33 views

What are these spots on my new bamboo palm?

Hi all! I’m new to gardening and want to know what’s going on with this palm I just bought from the Home Depot. There are white spots near the roots that look like fungus to me, brown spots higher up ...
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1answer
52 views

Wounded rhipsalis hanging cacti

I need advice caring for my hanging cacti. I think it's rhipsalis lepismium bolivianum? It's started to develop black patches along its limbs. Also some weird spots. And some white muck gathering, ...
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Black spots on echeveria leaves - cause?

Activity on 28-01-2019: Watered - soil is damp as of 29-01-2019, but it is a fast-draining cactus mix. Pest control - sprayed 2~3 times with pyrethrum bug spray (brand below) Fertilized - about half ...
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0answers
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Whats wrong with our two Jasmine Plants

We bought these two grown Jasmine plants 2 months ago when they had a few flowers and healthy green leaves. But now it looks like they are afflicted with some disease. We live in Pune, India. The ...
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0answers
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Whats wrong with my Basil sapling?

I live in Pune, India. The weather these days is like Temp: 15 to 30 deg C, Humidity: 30 to 60%. The sapling bought from a local nursery a month ago, the plant is kept in the shade. We water regularly,...
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Ragweed that has lost its' bloom and now has a cott0n type substance

Why does ragweed develop a cotton type of substance before it had a yellow flowers. It did have worms which I took care of with water.
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0answers
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What’s wrong with my aloe Vera

I’ve had this plant since August and recently it has lost a couple of leaves, I was wondering if anyone could identify a cause. Thanks
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0answers
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What is wrong with pedilanthus?

I live in Uttar Pradesh, India and I have planted pedilanthus in my vertical garden. They are in bright indirect sunlight. Their tips are turning pink and there is also some white fungus. What should ...
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0answers
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Part of the citrus leaves are dull and dark graying

I did look up different diseases online but I'm having a hard time finding a match for these symptoms, the leaves with the dull color feel drier and not as smooth the the touch as regular normal ...
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1answer
27 views

What's wrong with my tamarind?

These four saplings are grown from seed around 6-10 months was growing perfect untill around 4 weeks ago I started to see a little bit of yellowing thinking its nothing untill now.
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Buxus sempervirens - Deformed leaves

Can anyone help me? Suddenly my Buxus sempervirens appeared with the new shoots with deformed leaves. I'm in zone 9. It has not been cold though, and yes, it's a lot humidity every night.
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1answer
42 views

Why did my hibiscus flower size reduce?

My hibiscus plant used to give really big and yellow (dark pinkish almost magenta shade in centre) flowers but after a month the leaves began to curl inwards and the buds started to fall off before ...
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1answer
84 views

messy curry leaf plant

Couple of questions, 1) The leaves doesn't look very healthy, any idea what might help them? 2) What bugs are these? they are making a big mess, how to get rid of them?
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1answer
37 views

Peach root fungus?

Could someone recognize the disease in these peach tree roots? The smell is hard to describe but it's definitely not pleasing.
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2answers
55 views

My poor sick apple tree - what’s the mould?

This apple tree has this growth on many of its branches (say, 30%). It also hardly produces any fruit. How can I make this tree healthier?
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Why aren't my year-old apple seedlings thriving?

I planted a variety of seeds from apples from a local orchard. They have been growing for almost a year. They are about 8" and have suffered aphids and a white powdery fungus. I have sprayed plants ...
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1answer
62 views

Unhealthy orange tree

Our young orange tree (planted in the spring) has been healthy but growing slowly. I’ve noticed light blue spots on the leaves (EDIT: upon a second look, I realized that the spots are really white, ...
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0answers
47 views

What type of disease is my rose suffering from?

Can anyone help me identify what disease is infecting my rose canes as shown in the attached photos? Thank you Janice
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1answer
54 views

Is this some viral / disease on my plant?

I planted this 4 weeks ago and now I see that the plan developed a couple of these spots as you can see in the picture.
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67 views

Why are my potted outdoor Plumeria leaves turning yellow and brown?

All the leaves are yellow, with red around the edges and then eventually start turning brown?
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16 views

Magnolia leaves browning and falling

My Kay Paris Magnolia has browning leaves, which ultimately fall off. I also notice spotting on the leaves. Neighboring trees have a scale problem, but not much on this tree, which I also put white ...
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0answers
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Black spot on leaf of cardboard cycad (zamia furfuracea)

I live in Korea. I think that my precious cardboard cycad has some problem. Where the plant came from? I purchased cardboard cycad on the internet. It was delivered in 36hr. When it was delivered, ...
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1answer
155 views

Are black spots on Areca Palm contagious to other flowers?

I read here that those black spots caused by either bacteria of fungus aren't bad for my Majesty/Areca palm, but are they bad for other flowers which will be next to the palm? Will they become ...
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1answer
66 views

How can we save the trees in our historical garden from dying?

Our historical building is located in a big garden with 2700 pine trees in Khaf city, Iran, and about 300 trees have died. Is there anything we can do to save these huge trees? Khaf city has warm ...
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1answer
65 views

What is this disease is this on my basil and mint?

I have a mint and a basil right next to each other. First the mint and then the basil developed a similar leaf disease. Any advice is appreciated.
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Pineapple leaf discoloration?

Can some tell me what’s going on with my plant? I have not done anything different and this started when we moved it inside.
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1answer
59 views

Can These Plants Be Saved?

I believe the more dead one is sage. How should I help it? Also the plant with brown ends on the stems is mint. Should I cut off the brown bits? I don't care about harvesting or eating them I mostly ...
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1answer
44 views

Is this oak powdery mildew? How can I manage it?

I have just bought a new property that has a range of oak trees. Unfortunately, I noticed that some of the young trees in one area have a white discolouration of the leaves. After some searching ...
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1answer
142 views

Webs, black spots, and dying leaves- what disease is inflicting my plants?

I'm trying to identify an plant disease that has infested my sage, rosemary, and oregano. The plants have have a few webs on their leaves and there are black dots all over the plant, which don't seem ...
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0answers
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Magnolia not flowering well

My Magnolia ‘Vulcan’ flowers are not looking right. Attached photos are all new growth (in Australia, just entering Spring). Any thoughts as to the issue?
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2answers
114 views

What illness/pest has this dipladenia and what to do with it?

I've successfully rooted 6 dipladenias 4 month ago, they are in pots since 3 month. All went well so far, but now it seems they have some illness or pests. (All the six, although in different progress)...
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2answers
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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?
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My song of india plant have these light brown spots. What are they? [duplicate]

These brown spots are worring me please tell me are they natural or a symptom of a disease. They are just printed on the leaves.!
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3answers
72 views

Is there a problem with my Japanese Maple shrub?

We live in Vienna, Austria, very near the Danube. We planted this Japanese Maple in the first year after moving in the spring of 2013. It has been slow but steady growing, improving a bit every year. ...
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2answers
77 views

How to tackle this disease on an apricot tree

We live in Vienna, Austria, very near the Danube river. We planted this apricot tree back in spring of 2015 as a small tree bought from a local nursery. It has been growing very quickly and was ...
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1answer
42 views

Camelia with virus?

What is the problem with this white camellia? Some leaves are getting completely yellow but the plant is generally very vigorous. Is it virus? Is there a treatment?