For questions about plant diseases.

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0answers
25 views

What is wrong with my Mango plant?

I planted a mango seed this spring. And it went good. But growth stagnated after a while and totally stopped. Then I noticed some bulgy excrescence on the top, with a very dark almost black color. I ...
2
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0answers
24 views

What's wrong with this Photinia fraseri tree?

I've got 3 photinia fraseri trees in my yard in Tucson, AZ. They were planted last May (2013) and one of them is turning entirely brown and losing all its leaves (over the course of the past month or ...
4
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2answers
85 views

What are these small black things appearing on my cucumber leaves, and are they harmful?

There are these little black things on my cucumber plants that have started appearing recently. They are more concentrated towards the 'top' of the plant. They don't seem to be eating away the leaves ...
2
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2answers
100 views

What causes cucumber leaves to turn yellow, brown, wilt, die, and the plants to stop producing?

Every year it seems my cukes will go gang busters then suddenly the leaves turn yellow (starting with yellow spots), then turn brown, wilt and slowly die off. This all happens from the root crown and ...
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2answers
62 views

What are all the methods to control powdery mildew?

This particular disease is totally vexing! I admit, I love cramming plants together, especially in a garden. I hate bare soil. I do prune for aeration. I do use free water to wash off leaves early ...
2
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1answer
71 views

What are these reddish-brown growths on my succulent plant?

I recently discovered upon close examination of these strange, small, brown-reddish growths on the stems of my plant (picture below). This was a recent occurrence, after I placed the plant on the ...
2
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2answers
291 views

Is it safe to eat tomatoes affected by early blight?

My tomatoes have caught a case of early blight. Is it safe to eat the them? The fruit themselves look fine, but I don't want to feed my family anything that's potentially dangerous.
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1answer
70 views

What's causing my cucumber & melon vines to wither away?

I am in the UK and my cucumber and melon plants have started wilting. I used to water them twice a week and increased the frequency to once every two days since they started fruiting. They were ...
4
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1answer
43 views

What's wrong with my dwarf cherry tree's leaves?

I'm starting to see holes and some black spots on some leaves. Anyone know what this is and how I can treat this?
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2answers
438 views

What is causing the rotting/brown spots on my plum fruit?

I inherited a plum tree in my garden. I haven't yet been able to get a healthy looking plum from it. All the plums that turn to a ripe purple colour seem to have the following problem - Can anyone ...
3
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4answers
162 views

Is this flowering vine diseased?

I'm not sure what the name of this vine is, but about a week ago the flowers started to brown around the edges and then fall off completely. A couple of days ago the leaves began wilting. I did ...
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5answers
2k views

What do I do about the whitish powdery mold on my peonies?

Very early this year (starting in mid-May) my peonies' foliage was covered in whitish-gray powdery mold. What is it and what if anything should I do about it?
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0answers
58 views

Dry brown patches on cayenne chilli plant leaves, leaves starting to curl, tiny black spots

Note: I have posted a previous question regarding my chilli plants, its details may help in diagnosing this new issue. You can see it here: White, fur like strands and spots on underside of chilli ...
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4answers
3k views

Sudden Outbreak of Yellow Leaves on Tomato (and Other) Plants

My mother was in a panic this morning. She called me over to help her with her garden because many of her tomato plants had suddenly developed yellow leaves, many of which (but not all) also have ...
2
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1answer
80 views

Tomatoes…what is the difference between early blight and late blight?

What are the differences in early and late blight of tomatoes? Can you cut off affected areas of one or both to prolong the life of the plant? What can one do to prevent this disease, what can one do ...
3
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1answer
76 views

White stripy things on trunk are killing my plant

Something is killing my plant. The leaves are loosing their colour. On the branches, there is a white, stripy discharge that's slowly taking over the entire plant. Can someone identify this and tell ...
3
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1answer
99 views

White, fur like strands and spots on underside of chilli plant leaves

I am growing scotch bonnet, jalapeno and cayenne pepper plants indoors from seed. The scotch bonnet plants have what looks like white fur growing around the veins on the underside of their leaves. ...
2
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1answer
66 views

What would cause only one cane of a raspberry plant to show nutrient defficiency?

I have a Canby raspberry plant. One cane is showing some form of nutrient deficiency. On other hand, the other stalk is is flourishing and even budding fruit. What would cause this, seeing as the two ...
2
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1answer
49 views

My bean plants appear to have rust

They're a variety called 'yard long' I think. Could somebody confirm or let me know what else it could be? What's the best way to treat them? It has been a pretty wet spring. We're in zone 3/4. Oops ...
4
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3answers
181 views

Are my tomato plants damaged by a chemical or a disease?

Most of my tomato plants have started showing signs of what I think is Cucumber Mosaic Virus. I have shoestring, fernleaf, and curling leaves. They also have a leathery appearance. At first I thought ...
5
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1answer
105 views

What's affecting this tomato plant? [duplicate]

Can anyone tell what's wrong with this tomato plant? Is it disease or deficiency? My areas been having issues with late blight the last few years. One spot seems to have a concentric circle around it ...
2
votes
1answer
244 views

What is this yellow coloration of cotton wool used as growth media for hydroponics?

I have built a simple hydroponics DWC system, using a window box with aeration. Actually a system exactly like the below picture: I am growing lettuce and cabbage, and a week ago I have ...
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5answers
7k views

What are these hard white/brown spots growing on my houseplant?

A little more then an year ago I got six palm trees (two vases). It was the Californian equivalent of an Areca palm (the guy in the nursery suggested this one after I asked for an Areca for its air ...
5
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1answer
2k views

What is this white mold infesting my tomato plants?

Some kind of white mold is infesting several of my plants, below is one of the worst infections of a tomato seedling. It is very aggressive, if I remove the top layer of soil it will come back in a ...
3
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3answers
459 views

What kind of tree is this and what's wrong with it?

The developer in my neighboorhood was so kind as to plant trees in everyone's yard. But after 3 or 4 years all but one or two (so probably 180 or so) look scrawny and pathetic. I know nothing of ...
3
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1answer
105 views

Is this disease or sun damage on my Japanese maple?

There are dark-rimmed grey/white patches on my recently gifted Omurayama Japanese maple. Is this due to disease, or simply sun damage? There is the uncommon hole on leaves rimmed with the same ...
4
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2answers
292 views

What's killing this succulent?

The death toll of plants in my apartment continues to rise, having lost both a miniature rose and a rosemary plant to powdery mildew. Now something's killing one of my succulents. It was fine when we ...
3
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4answers
116 views

What's this gash on a Maple tree?

What's this gash on a Maple tree? It seems almost "infected" compared to the "normal" splitting I see on the other Maple tree right now. NOTE: It's been raining all day. That second photo is ...
5
votes
2answers
283 views

What is this disease on the growing tips of my peppers, and how can I control it?

Please have a look at these images of my hot pepper plant. Notice the growing tips which seem withered and diseased. What disease is this and what is causing this? What are the solutions to counter ...
2
votes
1answer
63 views

What are these red bumps on my cherry tree stems? [duplicate]

Tiny red bumps started appearing on my multi-variety cherry tree. They only appear on new terminal stems. They do not move. At first, I thought it was scale pest, so I sprayed neem oil on them twice. ...
2
votes
1answer
154 views

Repotting diseased chilli plants - possibly rust

My chilli plants appear to have developed rust after a bad attack from aphids! See photo below The leaves have also gone curly: My plan is to repot the plants, washing away the old soil and ...
2
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2answers
73 views

Why did my red bell pepper become tan colored?

I planted a red bell pepper seedling that I bought from a local nursery a couple weeks ago. It has been growing rapidly and upright. One of the egg-sized vegetables had suddenly developed a large tan ...
3
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2answers
67 views

How do you manage dying leaves on young plants?

If a leaf on a plant is shriveling or yellowing, should you cut it off or leave it there? If you do the former, should you only snip off the damaged parts or should you cut off the entire leaf? My ...
8
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3answers
2k views

Grapevine leaking water and white mucus

Problem While I was recently helping my mother prepare her garden for the spring, I discovered that the leak on her porch was not actually coming from the overhang above the door, but rather from a ...
2
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1answer
54 views

What are these white streaks on my tomato plant?

I've also seen similar streaks on my basil's leaves but not as pronounced.
2
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1answer
55 views

How to heal this needled plant?

This little guy is suffering and I'm not sure how to help him out. Any ideas?
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1answer
94 views

What could be the cause of rust spots and holes on leaves?

What could be the cause of rust spots and holes on the leaves of my Pluot tree? Other trees nearby do not have this. I'm guessing that those rust spots on the left leaf turn into the holes seen on the ...
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1answer
36 views

questions on deep root fertilization

One of the dog wood trees in my yard does not grow healthy. The tree care professionals recommend the so-called deep root fertilization, and I agree to move on with this operation. Yesterday, ...
3
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1answer
194 views

Why are the lower leaves of my tropical Guava yellowing and dropping?

I had a Century Guava (世紀芭樂) shipped over from Taiwan to zone 9 California. It is nearly 6 feet tall. I planted it in the biggest container that IKEA sold, 20 inches wide, 2 feet deep. I drilled many ...
3
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1answer
60 views

Tomato Disease treatment

My Tomato leaves are getting Yellow. I assume it some sort of disease. Until now I just tried to spray garlic on them, but it does not help. How can I treat it?
2
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0answers
43 views

Red blob on kesar mango tree (grown from seed in UK) [closed]

Last June (10 months ago) I planted a Kesar Mango seed. After we cut of two leaves to stunt its growth, two branches grew (FYI). Now, a very small red blob has appeared on top of it (see picture). A ...
3
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2answers
116 views

How do I find out & treat what is eating my hibiscus leaves

I was wondering what might be eating away at my hibiscus and how do I protect my poor little plant. I don't visually see any bugs on or under the leaves. Update: This plant is in a pot. Location: ...
6
votes
2answers
357 views

What is happening to the leaves of my avocado?

I have an avocado plant in my outdoors balcony. It's been growing nicely, but there are small brown dots/holes in the leaves for some time now. I don't see anything in the underside of the leaves, and ...
2
votes
1answer
100 views

Raspberry disease

My Raspberry has got some disease. Please see the picture. Can anyone advise me on what is this and how to treat it?
1
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1answer
59 views

What is this tan dried wood on my citrus tree?

On my tangelo tree, I have a lot of tan branches that are dried and don't have vegetation. What is causing this and should it be thinned off? I'm wondering if it has any relation to the desired tan ...
1
vote
1answer
189 views

Chilli Plant Bugs/Brown-Purple Staining

I have an indoor jalapeno, cayenne and birds eye chillies which I planted from seed and moved indoors at the end of summer. They have become infested with tiny bugs which live on the bottoms of the ...
11
votes
1answer
7k views

What is happening to my chilli plant? How can I help it?

Some white spots appeared recently on my Twilight chilli plant (indoors), on some leaves brown spots start appearing in the middle. First I thought - aphids, but it doesn't quite look like insects. Or ...
4
votes
1answer
137 views

What is wrong with my lemon tree? [duplicate]

Below is a picture of my lemon tree, which now have some sticky web infection. See left corner on the first picture. On the second picture is a close up of something that is being spread from the ...
4
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2answers
55 views

Why are my plants doing badly for the 2nd year in a row?

I live in Marin Co. California, where summers have been mostly hot and dry, winters mild with rain. All my plants are in pots, excepting the trees that were already here when we moved in 15 years ...
20
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6answers
294 views

Is it necessary to purchase seed potatoes?

I recently tried growing potatoes using a method I saw on TV. This is just cutting up potatoes into reasonable sized sections and placing them several inches down. The results have been fantastic. ...