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Questions tagged [diseases]

For questions related to plant diseases.

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1answer
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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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0answers
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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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0answers
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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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0answers
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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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0answers
20 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 ...
3
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1answer
39 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
47 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
14 views

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
47 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
76 views

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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0answers
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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
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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
54 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 ...
2
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1answer
38 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?
4
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1answer
52 views

What’s happening to my grapes?

Just in the past week, just as my grapes are ripening, this powder is showing up on some of them, and some of the green stocks are showing some brown. What’s wrong and how do I fix it? The vine is ...
2
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1answer
32 views

What is this disease on my carrots?

I have just discovered that some of my carrots have this very dense presence of insects. Are they aphids? I have learned recently that ants love to grow aphids and I could notice some ants around ...
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2answers
2k views

Why do my Cherry tomatoes split as they ripen? [duplicate]

It doesn't matter what I do, my Cherry tomatoes always seem to have many of them crack when/as they ripen. I have tried everything - more sun, less sun, more water, less water, different varieties etc....
2
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1answer
38 views

Who is bugging this Deutzia Gracilis?

The depicted Deutzia Gracilis has apparently begun suffering from some kind of invasion. Who is bugging it (probably aphids) and how can this be fought off (preferably without "strong" pesticides)? ...
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0answers
72 views

Hibiscus buds turning brown before opening

My Hibiscus is loaded with buds, however they turn dark brown and never open. The leaves did have some signs of disease but we have sprayed the plant and it is looking better, however the buds are ...
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1answer
46 views

Chilli leaf curl downwards

I have few chilli plants in a medium sized pot. Last few days I could notice some of the leaves are curling downwards and there is no color change. I am unable to find other issues in the plant. I ...
4
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1answer
67 views

Agave is sweating

It looks as if my agave is "sweating" a crystalline substance. The droplets are approx. 2 mm in diameter and twice as long. Is this as it should be (also the surrounding yellowish patch in the ...
3
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2answers
51 views

I was wondering if my Chocolate Mint plant had some type of disease?

So, I've had this Chocolate Mint plant for about a month now and some/most of the stems are brown. Some leaves on this plant also have brown spots on them, but not all are affected! So my question is: ...
2
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1answer
44 views

Leaves are dying slowly on Raspberry plant-what on earth is wrong?

I am in desperate need of some help. I have been trying to figure out what is killing my Raspberry plants and have come up with nothing so far. Let me give some background information that may be of ...
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1answer
55 views

What are the little white eggs on rose leaf?

Somes weeks ago rose food /w bad things killer was sprinkled on the ground. The three roses were, just a little over a week ago, hacked back for better access to attempt to clear myrtle that had ...
4
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1answer
51 views

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 ...
4
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1answer
426 views

Why has 20% of my pumpkin plant suddenly died and how can I save it?

So I had a thriving Pumpkin plant. For about a couple of weeks the big leaves in the middle of the plant (so the oldest leaves) started to yellow and get crisply on the edges. We've had 90 to 100 ...
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1answer
68 views

Dwarf Umbrella Plant Drooping

My umbrella plant suddenly started drooping. The leaves at the bottom drooped first and then the ones at the top. Now the whole plant has drooped. Is there any way I can bring back the plant? What has ...
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1answer
77 views

What is this disease with sticky transparent liquid and brown spots on leaves?

here is a picture of the plant, a shefflera. It has some very sticky transparent liquid on many leaves, and also brown spots. The spots themselves are kind of "dry" and mostly located at the leaves ...
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1answer
20 views

What's causing dry crispy leaves on Vaccinium Membranaceum?

I'm in the Willamette Valley in Oregon, USA, (USDA zone 8b) and I have a Vaccinium Ovatum, Vaccinium Parvifolium, and a Vaccinium Membranaceum in a section of my garden. They're shaded up until noon ...
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1answer
31 views

Basil leaves are scarred and wrinkled

My indoor basil plant has developed some scarring and has some pretty deformed leaves. Could it be due to the caterpillar that chewed up quite a few leaves a few weeks ago, or is something else the ...
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0answers
24 views

What disease does my hemlocks have

I am not entirely sure they are hemlock trees. They were not doing so hot when I moved in 2015, but it's getting worse over the past few years. They are located near Albany, New York State, US. ...
0
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1answer
25 views

Foliage Plant identification and help with yellow spotting on leaves

Can you please help me with two (related) things? Firstly, can anyone tell me what the non-ivy plant in the picture is? I got it at a local supermarket for Christmas a couple of years back, and it ...
4
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1answer
78 views

Why do I have brown “jelly” and rotten smell inside my healthy looking tomatoes?

I have about 30 tomato plants of several varieties, all hybrid except for one heirloom. Every single tomato plant is having the same issue but my peppers, eggplant, green beans, and cucumbers are fine ...
3
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1answer
90 views

What's wrong with my plants

I've recently bought Cestrum nocturnum from local nursery and transplant it in pot with 40% sand soil, 40% organic compost and 20% coco peat. But I don't know why its leafs are falling continuously. ...
2
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1answer
95 views

Kiwi Actinidia arguta Issai black spots / patches on younger leaves

I bought 2 mini kiwi plants (Actinidia arguta Issai) online. It was delivered from Netherlands in case that matters. They are growing well except for black spots that seem to be spreading a little ...
3
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1answer
21 views

Disease on walnut - light green convex lumps on leaves

There are convex light green lumps on the leaves of my family's black Walnut - only in one region of the tree. The reverse side of affected areas has like a fuzzy yellow crust. What is this and is it ...
5
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2answers
67 views

Is a virus, or something else, causing my tomato leaves to become shriveled, yellow and wrinkled?

Information: two tomato plants - one is some kind of a plum tomato, and the other is a black tomato. the plum tomato's seed was taken from a freshly cut plum tomato (which was bought at the ...
2
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2answers
150 views

yellowing leaves and black leaf parts on alocasia

info alocasia plant bought from a nursery placed in a well-lit corner of the room, without direct sunlight plant is not over-watered, only watered when soil dries got it for about 3 weeks now issues ...
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0answers
53 views

What pest is affecting my tomato plants?

This is the fourth year I've been growing tomatoes in my garden, but this is the first time I see this pest affecting my plants. The plants have black, brown spots on yellowing leaves. On some of the ...
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0answers
24 views

Is this green scale?

I have a small orange tree, and for the last few days the leaves are getting sticky and some green bumps and small white dots appeared in the trunk and leaves. From my google search it looks like ...
3
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1answer
160 views

What’s wrong with my Aloe Vera plant?

I have absolutely no idea what’s wrong with my aloe. It started getting these patches of light brown spots a few weeks ago and appears to have spread. Any advice on what it is/how to treat it?
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0answers
21 views

What, if anything, is wrong with our Ulmus Camperdownii

In October 2016, we planted an ulmus camperdownii in the Gulf Islands of British Columbia, Canada. This summer 2018, it has brown and white patches on its leaves. We're concerned it has a disease. ...
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0answers
42 views

My lemon tree has not grown for the last few years and has remained stick thin. Can you help me revitalise it?

Unfortunately this lemon tree hasn't grown for the last 3 years when it was planted. Its situated on the north side of the house and should have plenty of sun although it's winter now in Melbourne. ...
5
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1answer
45 views

How to treat a magnolia with white fuzz on its leaves?

I can’t find photos with similar problem in the internet. Therefore, I don’t know how to treat this. Please help me, the tree looks worse each day.
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1answer
31 views

Fig tree leaf color lighter than usual

Why does the fig tree (about 10x10x10feet in size) leaves have light green spots like this?
5
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1answer
440 views

Need identification on this growth on cherry & possibly plum trees and possible remedies

It's what I like to call The Alien Fungus, the plants don't seem to be happy about it, but they do give fruit - it grows in continental Croatia, Europe, typical yearly temperature range -20 to 40 ...
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1answer
24 views

Spots on Magnolia

My Kay Parris Magnolia has some odd white spots on it. I’m wondering what these could be and how to deal with them?
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0answers
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treating potato plant disease with ridomil

Potatoes in our garden got attacked by a disease. Take a look: Presumably, this is late blight. The recommended practice is to spray potatoes with ridomil fungicide. I am very skeptical about using ...
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1answer
54 views

Problems with Camellia sinensis

All my Camellia sinensis appear with the leaves like the foto shows. All the other Camellias ( japonica and sasanqua are Ok)- Please, someone knows what it is?
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0answers
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why do the leaves of my papaya tree twist and dry

I have papaya and mango saplings. But there are such problems on their leaves. Could you please help me ??I wanted to send a photo but I could not upload it.