Questions tagged [diseases]

For questions related to plant diseases.

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0answers
18 views

Unknown discoloration on tomato plant: how serious is this?

One of the tomato plants in our garden has discoloration both on the upper leaves and on one or two of the fruit, as here: How serious is this, and how should I address it? Is the plant salvageable? ...
4
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1answer
49 views

What are those brown / white spots on my cactus?

There are 3 of this same cactus sharing the pot. Only one of them is getting these spots. What could it be? Fungus? Sun burn? They are in my balcony, they don't get rain, and they get like 3-4 hours ...
16
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2answers
4k views

Why did my sweet corn kernels grow into this?

This corn is about 2 weeks premature to be picked. It had lots of green bugs and japanese beetles chowing on it, but I didn't do anything weird to it (no Ninja-Turtle ooze for instance). I can't ...
2
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3answers
41 views

What is damaging my tree Aloe?

I've had a Aloe plant for many years, mostly indoors. I finally repotted it a couple of months ago and split most of the pups off. All of the plants seem to have some sort of disease since then, ...
4
votes
1answer
96 views

Apple tree - Is this a disease?

Started noticing this from last summer(December, NZ) and now getting bigger. Had a good harvest last season, but, getting worried :( any information on what it is and whether to treat it or not will ...
3
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2answers
58 views

Lilac Tree Branches Suddenly Dying

I have a Japanese Lilac Tree that was fine 2 weeks ago now there is 2 dead branches and 1 that is starting to die. They are not isolated and are random, with the first near the base of the canopy one ...
3
votes
2answers
42 views

Zucchini, eggplant, melon and cucumber pest/disease?

I'm trying my hand at growing some vegetables on my balcony. I'm in Firenze, Italy, it's currently 30-35 degrees Celsius (about 95 Fahrenheit?) and I have full (10+ hours) sun on my balcony. The ...
0
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1answer
24 views

(NW Indiana) Yellow pumpkin stems and leaves

Northwest Indiana. Pumpkins were planted at the end of May. I noticed within the last 2-3 weeks the stems on both plants started turning yellow and the skin started breaking open (for lack of a better ...
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0answers
17 views

Damaged leaves - Bugs or what?

I've had an issue ever since I moved into my new apartment. I have plants in different rooms, all by the window in south/south-west orientation. There are different plants (basil, carrots, parsley, ...
0
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1answer
15 views

Staghorn fern back turning black

I have not been overwatering my staghorn fern, I water them at the base about 60cc every week. I don't most my plants very often and they have been stable for a year until this happened. The only ...
3
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2answers
44 views

Is it normal for an oak tree to slough off its thick bark without it growing back?

I have several oak trees in my forested back yard that are in various stages of loosing a thick outer layer of bark, revealing thinner whitish bark underneath. Once this bark is lost, it doesn't ...
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0answers
20 views

Acer Palmatum: New buds dying

After an extensive research through the web I did not seem to find a clear answer to what my acer is experiencing or how to act on it. I am not an expert and this is my fist acer, so I find myself a ...
4
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0answers
40 views

Cucumber disease/ pest identification

Can anyone tell me what is happening with this cucumber plant?
2
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0answers
37 views

Can I save my lucky bamboo by replanting its leaves?

My lucky bamboo is turning yellow from the middle outwards, most likely because of microbes which entered through a wound. I have already cut off a small green top of the bamboo, disinfected the wound ...
2
votes
1answer
32 views

What is the diagnosis and treatment of a 5 year old Blueberry plant?

Our five-year-old blueberry plant, that has always produced well is full of berries and all of a sudden has dying branches and leaves turning red. I’ve included picture. We did fail to prune it last ...
1
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2answers
45 views

Lilac tree disease

I have a pair of lilacs, very close together, which have been fine for ten years. This year they have hardly any leaves (just patches of them) and what appears to be a whiteish and partly yellowish ...
1
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1answer
47 views

Why is my mint dying?

My mint is developing brown spots on older leaves and is wilting. What disease is this? Can I save it? https://imgur.com/a/G3oceQM
1
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1answer
33 views

Use of hydrated lime as a calcium source

We have blossom end rot problem which is apparently a calcium deficiency. We have some builder's lime which I am told is calcium hydroxide and would like to use that as the calcium source. We can't ...
1
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2answers
83 views

Not sure what is happening to tomato plant

Not sure what is happening to my tomato plant. Plants have been in a really sunny spot. We had been in a drought, but we’re consistently watered. Then the last few days it started raining pretty heavy ...
1
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0answers
18 views

Black and Yellow dots on Scallions

I'm new to gardening and well recently I decided to try to grow scallions from leftover Scallion ends. first I placed them in water to grow them out a bit then I planted them in a random pot that had ...
0
votes
1answer
28 views

Why do my roses look dry, brown and full of holes?

I've been using Bayer's BioAdvance Rose and Flower care to feed and prevent insects/diseases. It did ok last season, not wonderful, but ok. This season my rose bushes are dry, they have brown/rust ...
1
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1answer
34 views

Mottled yellow leaves on Zucchini [pictures] - Disease ID?

I have some black beauty zucchini growing. I've noticed some leaves with a mottled orange/yellow color. It's not the whole plant but just some leaves. Other zucchinis in my garden of a different ...
0
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1answer
38 views

Why are my courgette leaves shrivelled and yellow?

I have a courgette (zucchini) plant growing in a container, and the older leaves have turned yellow, brittle and shrivelled at the edges, with a little mould also. What could be causing this? Is it ...
2
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0answers
45 views

What's this white stuff on my petunias?

Any idea what is happening here and how do I fix it???
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0answers
29 views

Yellow then brown spots on Kale leaves

I've been growing Kale under a 600W LED grow light for the past few weeks. My plants were doing quite well and I'd begun hardening off the oldest two to prepare them for transplantation. After 8 days ...
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0answers
12 views

Can I safely spray copper fungicide for peach leaf curl during summer?

My family has a peach tree with severe leaf curl which they did not notice; I picked up some copper octanoate (0.08%) fungicide today as soon as I noticed. With about half the leaves damaged, I'm ...
1
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1answer
52 views

Dark spots on plant with heart-shaped leaves

I have an indoor plant with thick, dark green heart-shaped leaves that has developed some small black and brown spots. Does anyone know what this is? I asked a question earlier this week about a ...
1
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0answers
33 views

Help! Tiny black eggs on thyme stem

I wonder if gardening gurus here can help? The thyme plant I bought from the garden centre has tiny little black dots all along the stems, though the leaves all look untouched and the plant seems ...
1
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1answer
65 views

Pepper plants are showing strange, deformed new growth, what could it be? Virus? Deficiency? Herbicide?

New-ish gardener here! This year I have planted 5 varieties of peppers in a brand new raised bed in central Arkansas (zone 7b). Fill for the raised bed is 100% compost purchased from a local plant ...
1
vote
1answer
93 views

Brownish yellow spots on monstera

Spots have developed on the leaves of my monstera deliciosa, and I've found nothing online that's quite like it. It's not on top of the leaf, can't be wiped off, and it's not growing in regular ...
1
vote
1answer
42 views

Grey spots on Clematis leaves

One of my clematis Tekla stopped growing a month ago and sort of froze in time. Its leaves started having grey spots and new growth leaves dried out as you can see from the picture below. Initially I ...
3
votes
1answer
39 views

Clematis leaves having white lines

On the below picture you can see some of the leaves of my clematis Hagley Hybrid having light grey lines of unusual pattern. I am afraid that if don't do anything, this might spread to other leaves. ...
3
votes
2answers
95 views

Clematis leaves turning purple

The picture below is of clematis Bourbon. Some of its older leaves are turning purple and I don't understand the reason. It has been like this for couple of months, we have new growth which makes me ...
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0answers
11 views

What are these whitish patches on my fig (I think) tree?

https://imgur.com/a/HczqGq9 This is a link to a higher definition image. Lower resolution below. Is it a sunburn? Or a fungus? I’m very new to this, and I’m hoping someone could please help me out.
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0answers
11 views

Wrinkles on Mangoo tree leaves

In my lawn I have 3-4 different types of mangoo plants (1-3 years old). Few weeks back I diagnosed that leaves are curling and turning brown, I googled it and found that its some fungus and I need to ...
0
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0answers
28 views

What are the brown spots on my tomato leaves?

These spots have been developing since the weather turned from hot and sunny to overcast with showers. The closest images I've found online are of magnesium deficiency, but I'm not convinced enough ...
1
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1answer
49 views

Help me diagnose my tomato plant's stem problem!

I'm a beginner gardener, and growing tomato plants for the first time. I need help diagnosing a problem on my stems! I regrew my three plants from seeds of a small heirloom tomato that I came across ...
2
votes
1answer
34 views

Yellow/brown spots on monstera

For a couple of months, small black spots have been slowly spreading on two of the leaves of my monstera. On one leaf, they got worse, and ringed with yellow, then suddenly the leaf died. The black ...
0
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0answers
9 views

Banana Tree Sucker Has a Brown Blotch on New Growth

I recently separated this banana tree sucker into its own pot and it's been growing tall very fast. However, some of the growth is brown as shown. Does this indicate anything such as a lack of ...
0
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0answers
10 views

Help identifying cause of withering discoloration on raspberries

I am seeing the following discoloration and withering on a very small number of leaves of my raspberry primocanes I only see this on the tips of the canes, and only on the primocanes. Is this ...
2
votes
1answer
20 views

small brown bumps on majesty palm leaves

I am home visiting my parents and they have had a majesty palm for few years. It's never really thrived as we live in Canada and are not gardening experts. Besides its yellowing, it also has small ...
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0answers
16 views

Strange leaves marks on zinnia and Mint

This morning I have noticed some strange marks on my Zinnia leaves and the leaves of the mint growing nearby: What could that be? And what could be done with it? They both grow on an east-oriented ...
0
votes
0answers
11 views

Pepino gold has white spots (not edema, not midlew) and I’m clueless

My pepino gold melon developed some tiny white spots on leaves, first it was just the leaves and looked like edema caused by overwatering (which I know can happen for peppers) so I cut back the ...
1
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2answers
69 views

Tomato plant stem and leaves turning dark green/black with yellow circles

I have a few tomato plants where the tops of the leaves and stems are turning dark green/grey. Additionally, yellow circles are appearing on the leaves. These were recently transplanted from indoor ...
0
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0answers
15 views

Mango Tree Young & Old Leaves Curling, Turning Crispy, Drooping, and Browning at the Tips

My tree is grown under a 2000W grow light a little over 3 feet away from the top of the foliage in 70F indoor weather. I figured I had a salt toxicity problem with my old clay pot full of salt all ...
0
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0answers
8 views

Spots on cucumber leaves

Two leaves from teh same cucumber plant, thinking these are two separate issues (lucky me). As seen in the photo, the lesions on the left are pale tan and don't really look like they're bounded too ...
2
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0answers
17 views

What are these yellow spots on my Melocactus concinnus?

I purchased this Melocactus concinnus online a couple of months ago. I don't remember seeing those yellow spots on the bottom half of the cactus. It's possible, however, that I just didn't pay close ...
0
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1answer
40 views

White and black spots on indoor plants: cayenne pepper and salad seedling

many of the plants I'm growing indoor are having these white and black tiny spots on leaves. Some of my seedlings are affected by it as well. The underside has mostly small black spots. From the ...
3
votes
0answers
17 views

Squash vine stopped growing?

I've seen this on several squash plants, where the vine seems to stop growing but the growth tip is still trying to produce fruit. Not sure what this is called - internode shortening or something? ...
0
votes
1answer
29 views

Rose tip got brown burn quilted and dropped rose head

I bought this rose from David Austin last year https://www.davidaustinroses.com/us/the-poet-s-wife-shrub-rose Every since it was fine until I check it today in May 25 (I am in Pacific Northwest) It ...

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