Questions tagged [diseases]

For questions related to plant diseases.

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10 views

Please identify cause of dead spots on my Malabar spinach

I noticed there are small spots on the plant, but they keep getting bigger and eventually turned brown, like dead spots on the leaf. How do I get rid of these? I've already cut all the affected leaves ...
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1answer
33 views

Why are my daisy flowers dying? :((

Ive got Osteospermum (African Daisy), however I cant figure out why the flowers are getting their petals chopped and are mostly dying, The plant seems healthy and I cant see any insects or bugs around....
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1answer
24 views

How to cut calculated height with trimmer

I recently redid our lawn and it was beautiful grown turf (thanks to @bamboo) until the mice/rat (we can’t figure out what is that)next door ruined it and tried to dig places. Now from book of ...
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1answer
21 views

What caused the leaf discoloration in my Kaffir lime?

The leaves of my kaffir lime plant have the grainy discoloration which looks like a disease. I assume normal leaves would be plain dark green. I didn't see insects or aphids living or staying in the ...
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8 views

Dying Jacaranda

I posted a few weeks back asking you guys why there was a deposit on my Jacaranda leaf. I didn’t got an answer but I found out online it could have something to do with my water and that it was ...
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2answers
61 views

Diagnosing white fuzz on kale. Is this powdery mildew?

I think I'm dealing with powdery mildew, but I want to confirm that diagnosis. Context: I'm in Portland, OR. I've got several raised beds with a couple kinds of kale, broccoli, brussels sprouts, some ...
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0answers
20 views

Is my orchid diseased?

I bought a pair of Vanda orchids online. One of them looks fine and healthy but the other one had black bruising on the leaves more than halfway up the plant. The articles I read.on the net suggest ...
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0answers
27 views

What's wrong with my fairy castle cactus?

My cactus used to be really thick and dark green but now it's so much skinnier and starting to shrivel up. Some of the arms are turning a dusty kind of brown and they're all leaning away from the stem ...
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14 views

What’s happening to my Jacaranda

Recently my jacaranda leaf are starting to appear lazy and heavy. I’ve notice some deposit on the leaf, what is it? Should I be worried?
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0answers
21 views

What are these gall like growths on my spuds?

I noticed a volunteer potato plant in the garden a month or so ago which I thought was cool. It's just now at the tail end of winter in the southern hemisphere. Today I noticed that it had gall like ...
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17 views

Single large brown spot on Dracaena Dorado

I have been giving my dracaena dorado some fertilizer this year, on and off, maybe twice a month or less since March. I let it dry out between watering. The leaf tips were turning brown so I moved it ...
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19 views

Yellowing spotted morning glory leaves

I'm wondering what's causing the leaves of my morning glories to turn yellow and develop black/brown patches, along with what looks to be like white mold, as shown in this photo: This is worse in the ...
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1answer
23 views

Browning on Silver Spurflower leaves? Is this a fungus or lack of water?

I have noticed over the last week my Silver Spurflower leaves have started to go brown and start curling. They are in large containers and other plants in the containers have also been getting similar ...
3
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1answer
36 views

Any scientific expanation on Thuja Occidentalis turning brown (dry)?

Thuja Occidentalis trees often turn partially brown, dry and they never tend to recover on their own. My problem is definitely with entire branches (as opposed to individual leaves). I water the trees ...
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3answers
41 views

Scales/disease on tree?

I have this large tree in my back yard that has about 20% dead branches. The tree is very tall, probably 40+ feet. Most of the branches have this scale on them, and many of the leaves have brown spots....
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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? ...
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1answer
53 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 ...
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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 ...
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3answers
52 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
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1answer
98 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 ...
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2answers
100 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
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2answers
43 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 ...
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1answer
29 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
19 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, ...
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1answer
28 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 ...
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2answers
45 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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25 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 ...
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0answers
41 views

Cucumber disease/ pest identification

Can anyone tell me what is happening with this cucumber plant?
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0answers
38 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
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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 ...
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2answers
94 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 ...
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1answer
49 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
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1answer
35 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 ...
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2answers
87 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 ...
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0answers
20 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 ...
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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 ...
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1answer
40 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 ...
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1answer
40 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 ...
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0answers
48 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
33 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
13 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 ...
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1answer
77 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 ...
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0answers
35 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 ...
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1answer
84 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 ...
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1answer
197 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 ...
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1answer
44 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 ...
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1answer
45 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
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2answers
122 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
12 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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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 ...

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