For questions about plant diseases.

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2answers
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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 ...
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1answer
56 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
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1answer
30 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 ...
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1answer
64 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 ...
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1answer
35 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 ...
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1answer
53 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 ...
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3answers
102 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 ...
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2answers
106 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 ...
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2answers
190 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
77 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 ...
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1answer
83 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 ...
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1answer
85 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 ...
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1answer
52 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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1answer
131 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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1answer
85 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 ...
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1answer
162 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. ...
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1answer
100 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 ...
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2answers
437 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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2answers
450 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 ...
2
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1answer
69 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 ...
5
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1answer
111 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 ...
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3answers
464 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 ...
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4answers
165 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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3answers
198 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 ...
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1answer
51 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 ...
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4answers
135 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 ...
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1answer
84 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. ...
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2answers
71 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 ...
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1answer
79 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.
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1answer
60 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
112 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, ...
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2answers
75 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 ...
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1answer
304 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 ...
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0answers
48 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 ...
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2answers
154 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: ...
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1answer
123 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?
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1answer
74 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 ...
3
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1answer
64 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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1answer
193 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 ...
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1answer
267 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 ...
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2answers
425 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 ...
4
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1answer
180 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 ...
3
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1answer
117 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
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 ...
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1answer
89 views

How Can I remove leaf eater insect from the lemon plant

There is one lemon plant in my house where in each season there are lots of lemon are to be produced. But in this time I figured out small leaf eater insect on the plant which is eating the leaves of ...
2
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1answer
270 views

What are these black spots on my rose tree?

If I press these little dots, there is a white cream-like substance inside. Some leaves are completely eaten, but I am not sure if it is linked. This plant, a rose tree, had fallen on the ground ...
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1answer
118 views

What is this black spotted disease on my orange tree?

Is this mushroom or animal? I can remove the black dots by slightly scratching the leaves.
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1answer
94 views

Is green tissue in the center of cherry tomatoes related to 'Yellow Shoulder Disorder'?

I've read about the "Yellow shoulder disorder" in tomatoes, and I was wondering if I have something similar going on with my cherry tomatoes. Some of them do indeed seem a little less colourful on ...
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1answer
111 views

What are these weird lumps on this spruce tree?

There's a spruce tree growing in a park near my house. It has lumps like this on a lot of the branches. After a while, some of the lumps look like this: Is this a disease, or just a part of the ...