For questions about plant diseases.

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4
votes
3answers
98 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 ...
4
votes
6answers
3k views

Why are my cucumber leaves turning yellow?

My cucumber plant's leaves are turning yellow. Could it need nutrients already? It only germinated 24 days ago, but is my biggest plant already.
2
votes
1answer
20 views

What kinds of pathogenic plant mildew are there, besides powdery & downy?

Are there any other kinds of mildew that affect garden plants besides powdery mildew and downy mildew? If so, what are they?
5
votes
3answers
47 views

What's causing the edges of my blueberry leaves to burn?

Last year, this Sunshine Blueberry plant was doing stupendously - not a burned leaf in sight. Now most of the leaves appear like they're burning. Also, the fruit never mature to full size before ...
16
votes
6answers
10k 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
votes
2answers
49 views

white material on roots of apple tree?

When I dug up a young apple tree to move it to a sunnier location, I noticed some sort of white material on the roots. Is this cause for concern?
3
votes
1answer
77 views

Grapes leaves too dry - is that normal?

Recently I noticed my green grapes leaves don't look too good. There's nothing like scales or ants or any other sign of parasites. Only older leaves are affected, new ones are fine as you can see on ...
1
vote
0answers
34 views

What are the white specks on my Strelitzia's leaves? [closed]

I have a white fungus on my Strelitzia. It started as little specks on the leaves and I would like to know what it is, what caused it and what will get rid of it.
2
votes
1answer
42 views

Can any one tell me what are these white cotton like substances growing on these leaves?

My chili plant leaves have these white cotton like blobs growing on them. Is this some kind of disease? Sorry, for bad image quality.
3
votes
3answers
52 views

How to completely rid my potting soil/container of fungi which seems to continually attack my plants

So, after so many dead plant and ruts, I have come to realize that for some reason, my plants seem to contract some fungal issue most every week. I am not exactly sure why but I have had to pluck up ...
2
votes
2answers
189 views

Can dragon fruit get scale?

I think that my dragon fruit has scale. This is my first encounter with scale so I want to check first. I assume that any plant can get scale. When researching it I never saw it mentioned on cacti so ...
3
votes
1answer
45 views

Is this a sign of some disease or insect damage? (Piel De Sapo plant)

I tried doing some research into what might be causing the damage, as the vine is also damaged slightly. I looked around the rest of my garden and the winter melon and hairy melons are growing ...
5
votes
1answer
55 views

Should I rotate border vegetables, or plant a perimeter of onions/scallions each year?

Last year my wife and I planted our first ever organic vegetable garden (raised bed made of cedar) and pretty much just "winged it"; and surprisingly had very good yields. By "winged it" I mean, we ...
9
votes
1answer
526 views

What are these brown, cap-shaped mushrooms on my birch tree?

I live in Massachusetts and have several birch trees in my yard. One of them has brown, cap-shaped mushrooms growing in groups up and down the trunk. As you can see, the tree has a big crack in the ...
4
votes
1answer
35 views

Should I remove brown, cap-shaped Birch Polypore mushrooms from my tree?

I learned from this question that my birch tree is infested with Birch Polypore mushrooms. For two reasons, I'm wondering if I should remove them. First, even though they grow because the tree is ...
3
votes
3answers
1k views

What causes my zucchini leaves to become light yellow?

Please have a look at these images of my zucchini plant: What disease is this and what is causing this? What are the solutions to counter this? Location: India. Weather In May-June: Hot! > ...
11
votes
2answers
1k views

How to treat a succulent with holes in its leaves?

I have a succulent plant that got some disease and is covered with holes. The holes started to appear a month ago. At first they were green (like something was eating it), probably growing and then ...
2
votes
2answers
65 views

How far apart do raspberries and blackberries need to be planted?

Most horticultural guides I've read recommend not planting blackberries and raspberries near each other because they will spread diseases between each other. How far apart do they need to be to ...
4
votes
1answer
115 views

What is wrong with my Philodendrons' stems and roots?

The stems of my Philodendron 'Brasil' are getting brown and soft. Is it some kind of disease? I'm growing them hydroponically. Click photo for full size
3
votes
1answer
37 views

Home-made Solution for White-Spotted Curley Leaves on Pepper Leaves

I had bought 10 pots of peppers a while back. Not all of them seemed healthy, but since they had the fruits, I thought I can use the fruits and bin the pots if I can't keep them. I was keeping them in ...
3
votes
3answers
117 views

What's wrong with this Photinia fraseri tree?

I've got three Photinia fraseri trees in my yard in Tucson, Arizona. They were planted last May (2013) and now in September (2014), one of them is turning entirely brown and losing all its leaves ...
5
votes
1answer
76 views

How can I control mint rust?

Sharing knowledge here: Since I live in the San Francisco Fog Belt, I suffer from a variety of soil-borne funguses, including mint rust. In fact, mint rust is so severe that in the past I've had to ...
4
votes
1answer
208 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 ...
5
votes
2answers
397 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 ...
1
vote
1answer
45 views

Will coppicing a Siberian elm tree get rid of bacterial wetwood (slime flux)?

Will coppicing a Siberian elm tree cure it of bacterial wetwood or slime flux? I know you can coppice Siberian elm trees and they will grow back (if what I've read about people trying to kill the ...
2
votes
1answer
61 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 ...
4
votes
2answers
120 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
votes
1answer
95 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
votes
2answers
473 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.
4
votes
1answer
94 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
votes
1answer
61 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?
5
votes
2answers
463 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
votes
4answers
168 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 ...
11
votes
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?
8
votes
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
votes
1answer
135 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
votes
1answer
93 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 ...
4
votes
1answer
260 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
votes
1answer
75 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
votes
1answer
56 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
votes
3answers
207 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
votes
1answer
117 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
359 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 ...
5
votes
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
votes
3answers
471 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
votes
1answer
127 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
votes
2answers
403 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
votes
4answers
150 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
300 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
103 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. ...