Questions tagged [diseases]

For questions related to plant diseases.

99 questions with no upvoted or accepted answers
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261 views

Pinus sylvestris yellowing problem

I'm pretty new to gardening and I recently (~2 weeks ago) got a Pinus sylvestris 'Fastigiata' plant and I noticed that some needles started to yellow. Here are a few pics:- The yellowing is mostly on ...
5
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0answers
418 views

What disease is affecting my Dypsis lutescens?

I received this Dypsis lutescens (palm) plant as a gift last spring, it had only two leaves and it was potted in nursery soil with sand. Recently I have noticed that the outer leaf started to form a ...
5
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1answer
311 views

When is the critical period for blossom end rot in zucchinis / courgettes?

It's nearing the end of the season for zucchinis for me, and some of my zucchinis are showing signs of blossom end rot. However, other fruit on the same plant are fine. Now BER is said to be caused by ...
5
votes
1answer
471 views

What is happening to our potato plants? (going black, wilting)

We have a row of 3 different heirloom potato varieties, 50 originally, of which we've lost about 15 to a problem we'd like to identify. The following photos show the start of the issue, through to a ...
5
votes
1answer
105 views

What is the powdery mildew and why are my cucumbers not growing beyond 1 inch?

I have a healthy cucumber plant to all appearances. There is some powdery mildew which I am trying to contain with a spray for that disease. However, I have lots of buds which turn into tiny ...
4
votes
1answer
458 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 ...
4
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0answers
51 views

What is this foliar/fruit disease on our pear trees?

This year both of our pear trees (especially our dwarf Bartlett) have a new foliar disease that I've never seen before. It looks a lot like edema with the bumps, but with a lot more discoloration and ...
4
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0answers
578 views

What are these barely visible white spots and brown edges on my citrus plant?

I have a citrus plant and something else growing in a pot. The something else had some barely visible white mold-like spots for a few months, and now its and the nearby citrus plant's leaves are ...
4
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0answers
196 views

Globe Willow keeps going into shock

I live in Northern Arizona and globe willows do really well around here. However, I am having the opposite problem. Mine has went into shock twice this year. The first time I trimmed the dead branches ...
3
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0answers
33 views

Avocado plant white resin/wax like substance on back of leaves. What could it be?

I planted an avocado plant from seed about 2,5 years ago. The plant seemed to grow well, but I moved it alot, due to unproper conditions (lighting, temperature). For the last year, though, it stayed ...
3
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0answers
13 views

How to get rid of the White fly

I noticed I got once again the white fly in my herbs and vegetables. I tried to get rid of it by planting Basil close to them, and it worked for some time but now is back again. I heard trying vinegar ...
3
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0answers
78 views

What is wrong with my Hydrangeas

My hydrangeas were looking beautiful until a few weeks ago. Then I started noticing that some of their leaves had these gray powdery looing spots on them, their blooms started having brown spots and ...
3
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3answers
80 views

Colocasia esculenta leaves drying

I have a few colocasia tubers planted since 2 months in a cocopeat perlite vermiculite compost 2:1:1:2 potting mix. Its leaves dry up when they reach a medium size after having a crispy bit of edge ...
3
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0answers
48 views

No leaves on tree tops. What’s wrong?

I’ve got two trees that didn’t get leaves on their tops. Should I be concerned? One is a twisted baby locust and the other is a scarlet oak tree. It did get really warm here and then freeze in the ...
3
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0answers
69 views

How to diagnose brown spots on dogwood leaves

We have a pink dogwood that was planted two years ago. Its leaves all have brown spots, and some leaves are quite covered with brown. It is more pronounced this year than last year. From research ...
3
votes
1answer
136 views

Is my red oak tree dead? Only suckers growing:(

I need help! I got this tree approximately two years ago May 2017 to be exact and it was fluffy lots of leaves!! However, this year it did not grow any new leaves only suckers, can anyone please give ...
3
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0answers
30 views

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 ...
3
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0answers
83 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 ...
3
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0answers
36 views

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.
3
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0answers
40 views

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 ...
3
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0answers
150 views

Can someone identify Desert Rose Leaf problem?

I bought this Desert Rose from a big box store on clearance about a month ago. The leaves had this trailing/patchy lighter discoloration on the leaves when I purchased. Thought I could re-pot it and ...
3
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0answers
47 views

How come my majestic palm has patchy dried out spots?

This is an indoor pot plant. We have quite a bit of natural light thanks to a skylight, but not much direct sunlight unfortunately. The dry patches have been there for a while and I’ve tried various ...
3
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0answers
899 views

What are the white and black spots on the under side of my chilli leaves?

I am a newbie to gardening and was so chuffed to see my chilli (the plants are Chile guajilo and Chile chipotle) plants grow up. However, I have noticed leaves starting to fall. These leaves have, on ...
3
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0answers
39 views

How effective is a phosphonate treatment for phytophthora dieback?

I found on the Internet that the fungal disease phytophthora dieback can be treated with phosphonates. I am asking how effective this treatment is. If it's not very effective, is there any other ...
3
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0answers
649 views

What causes dark brown spots on guava fruit?

I am from India and I see that young guava fruits have dark black/brown spots on them. I grow them at my home. I have attached photos of the fruits. Could someone help in identifying the disease and ...
3
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0answers
2k views

Brown spots on herbs - treatment and are they ok to eat?

The leaves on all my garden herbs (mint, sage, oregano, thyme, lemon balm) get yellow-brown speckles from late spring, which by late summer almost entirely cover the leaves. What might this disease (...
3
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0answers
100 views

Is this bay tree dying?

This tree has just recently got these marks on all the leaves and there's no new growth this year. I'm afraid it's dying but is there anything I can do?
3
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0answers
369 views

What is this substance that looks like red sap on my cucumbers?

I have this weird red sap on a few of my cucumbers. I was wondering if anyone has seen this before? These cucumbers were grown in our conservatory in the back garden (facing south) in pots, grown up ...
3
votes
1answer
137 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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0answers
56 views

White coating on bottom side of pepper leaves

I just noticed this white coating on the bottom side of a few leaves of my pepper plant. I can not wipe it off. Is this some kind of fungal disease or some pest? Edit: I made some more images using a ...
2
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1answer
58 views

What are these white things on new leaves?

I have roselle planted. But I see these on the leaves. What are these? Edit: Added closeups
2
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0answers
34 views

Purplish discoloration on the leaves of solanum torvum

Recently my Solanum torvum started developing purplish discoloration on the leaves It is visible primarily on the top surface of the leaf, and lower, older leaves are more affected than the top ones. ...
2
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3answers
119 views

Holes on my succulent leaves

Hi, my succulents have recently been getting holes in them and I have no idea what it is. Please help!!
2
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0answers
43 views

What wrong with my cactus

Ive had this cactus which i think is a Pachycereus Schotti/Monstrosus since years and its been growing fabulous. Ive just recently noticed it acquired some brown scales (non Insect) and looks like ...
2
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0answers
29 views

Why is my passion fruit's leaves are yellow? Is it dying?

I've bought a plant of passion fruit. Recently I've changed the ground of it. Several days ago the leaves began to be yellow and curled up. The photos are below. Could you please give an advise how ...
2
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1answer
32 views

Gardening. Potted cucumber plants

My potted cucumber plants appear to have mosaic virus. How is an insect barrier created?
2
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0answers
22 views

Disease on Thuja Occidentalis

In our garden there are two northern white-cedars (thuja occidentalis) that have gotten a strange light-greenish area on the base of their stem (see the image enclosed). The infected species are in ...
2
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0answers
37 views

Do these watermelon plants show signs of mosaic virus?

I salvaged and planted three watermelon seedlings a few weeks ago after my, somewhat flimsy, greenhouse blew over in a wind storm. The seedlings seemed to be thriving in their new homes, but this past ...
2
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0answers
26 views

Fruit cherry leaves got eaten by something?

I have bing fruit cherry tree and the leaves look like these It is randomly at different spots. Is this something I should be concerning? Is it caused by disease or some bugs eating them? UPDATE 1 ...
2
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0answers
267 views

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 ...
2
votes
0answers
28 views

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 ...
2
votes
0answers
30 views

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,...
2
votes
0answers
11 views

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 ...
2
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0answers
51 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
2
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0answers
327 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?
2
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0answers
61 views

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, ...
2
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0answers
30 views

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.
2
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0answers
19 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?
2
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0answers
34 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 ...
2
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0answers
69 views

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.