For questions related to plant diseases.

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5
votes
2answers
111 views

What is wrong with this Magnolia

we have this medium sized magnolia in a pot since a bit more than a year. It survived the winter with us ocassionally taking it inside the house to prevent it from frosting. When spring came it ...
3
votes
1answer
35 views

Tomato Plant Stalk Appears Diseased

Found this in my garden today: My tomato plants appear to be quite ill. The lower stalk is covered in bumps, and it looks like they start at the base. Most parts of the plant are fine, but I am ...
3
votes
0answers
74 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 ...
1
vote
0answers
27 views

How to keep cucumber beetles/bacterial wilt from spreading when removing infected plant?

I have some cucumber plants that are very infested with cucumber beetles (mostly striped, some spotted). The plants are dying from bacterial wilt, and although it's hard to access all leaf surfaces ...
3
votes
1answer
48 views

Cucumber with bacterial wilt, what to do to save other plants?

On Saturday, my cucumbers looked perfectly healthy. On Sunday, half of one of my cucumbers had very wilty leaves. On Monday, the other half of the cucumber's leaves were all wilty. I have seen ...
3
votes
2answers
61 views

Abnormal tomatoes on my tomato plant

I have a few tomato plants growing in a raised bed. I grew them from seeds. For some reason a few of the tomatoes don't look normal ( see pictures). Also the size of the fruit is much smaller than I ...
1
vote
1answer
23 views

What should I do to prevent plant diseases from spreading while having them live close together?

Is there any good guidelines for how to space plants so that you can prevent plant diseases from being spread between plants, while still having them able to work together in order to pollinate each ...
4
votes
1answer
49 views

Is this the tomato potato psyllid?

I noticed these sugary white granules on my tomato leaves a couple of months ago, and saw some insects which I thought were aphids but didn't look closely. Now it looks as though my potatoes are ...
3
votes
1answer
104 views

Why are my morning glories stunted/deformed?

I planted some morning glory vines (Ipomea sp.) outdoors in a box about 10 weeks ago (mid-March, I'm in Zone 8) and they've been underperforming the whole time -- the vines are not even a meter long, ...
8
votes
5answers
135 views

What is wrong with my beefsteak tomato?

My beefsteak tomato is setting lots of fruit, but the larger leaves are curling, and have fine black spots. The pot is 24x24 inches, and the soil is miracle gro. It's new in this pot this year. ...
1
vote
1answer
28 views

Is my tree diseased? Can I cure it?

I have a two-year-old apricot tree about six feet tall growing in a salvaged water tank. Many if not most of the leaves have one or more of little "blisters" on their stalks, as shown below (each ...
5
votes
2answers
48 views

It is good to use water of a pond to irrigate my garden?

I am growing some vegetables in my garden and I also have a pond where some turtles and fish live together. I thought maybe when I change the water of my pond could I use that water to irrigate my ...
13
votes
3answers
14k 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
182 views

What should we do with a 7-8 year old honey locust tree that has been damaged by disease?

2009 diseased honey locust: June of 2016 full view: We have a honey locust that developed a disease within it's first year and an arborist saw it. He told me it is what they call herpes for ...
12
votes
3answers
3k views

What's attacking one Lupin but not its neighbor?

I have two Lupin plants next to each other in my front yard: They are both Russell hybrids, both grown from seed and planted there at the same time in Spring 2009. The one on the left is healthy, ...
6
votes
1answer
64 views

Why are my basil's stalks turning brown and dying?

I googled and it seems that basil does turn woody after some time but the leaves on these browned stalks look really unhealthy, like I haven't been watering them. Also, the stalks got thinner after ...
22
votes
7answers
22k 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
1answer
155 views

Orange spots on Polypodium

A few months ago I asked a what kind of plant my office plant is and how to take care of it. I got a clear answer on that recently, but I just discovered orange spots on some of the leaves (NOT ALL!). ...
3
votes
0answers
141 views

Beet plant - leaves turning yellow-brown

I have a beet plant that I grew from seeds. They started off great and healthy. In fact I plucked some leaves to use in a salad. After that some of the leaves are turning yellow and drying up. What ...
8
votes
1answer
6k views

What is causing the bark on my crabapple to crack and peel off?

I have a flowering crabapple in my yard whose bark has several large areas where it cracks and curls away from the wood underneath: Hover over any image for description / click for full size I ...
3
votes
1answer
151 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
56 views

Diagnosing if a tree is dead

I found a very large branch in my yard. Looking up, I was surprised to see a a bare tree amongst the leafy ones, from which this branch had fallen. Not a tree expert but I'm guessing this one is ...
0
votes
0answers
20 views

Small brown scales on my lemon tree [duplicate]

My small lemon tree has been showing these scabs for a while. They are brown, mm sized, and fall off very easily just touching them with a finger or a nail. Examining the soil with a lens I also noted ...
1
vote
0answers
47 views

Brown spots appearing on roma tomato leaves

Three weeks ago I bought a roma tomato plant from Home Depot. It was probably about 8 inches tall. Since then, it was in my apartment for a few days and then my friend's apartment for about two and ...
7
votes
3answers
115 views

Dying Lawn - brownish/white with moss and clumps

I am trying to figure out what is killing my lawn. The pictures below were taken a few days ago.There is only the one area of this occurring and the yard is about 1/2 acre. The dead area has been ...
5
votes
2answers
54 views

Weird growth on wisteria stem

See attached picture. Is this growth normal? If not, what do I do?
1
vote
1answer
37 views

Spots on marigold leaves

I was sprouting some French marigolds and noticed some spots on the leaves. They didn't look good, especially since one of the plants didn't get them. I looked them out on the internet and figured it ...
4
votes
0answers
50 views

How to start over-pachysandra decimated

I had a beautiful, thick, well established patch of pachysandra in my yard that is now decimated. To put it mildly, I don't have a green thumb and since I have a full time job and three young kids I ...
8
votes
1answer
54 views

What is this Apple disease?

Close up of lesions Close up stem side I've had this Apple tree for a couple of decades which I had always assumed it was wild since it had always produced sour small apples. For some years the ...
6
votes
0answers
34 views

How do I eradicate Pseudoperonospora cubensis on roses?

I have some roses that look like they are infected with Pseudoperonospora cubensis. I currently do not know how to treat this disease and would like a course of action. I have not applied any ...
6
votes
0answers
37 views

Are these brown areas on my dracaena leaves a disease? [duplicate]

My dracaena has several leaves with this kind of quite big brown areas on them: Photo source Does this look like a disease or might it be only bad caring? I have a separate post related to ...
5
votes
2answers
74 views

How can one prevent baby/recently sprouted plant disease?

When one desires to germinate seeds in the seedling tray, he/she has to keep a humid and warm environment. But this environment is also favored by fungus. Other than sterilizing the soil, how can one ...
5
votes
3answers
292 views

Disease / pest identification

What could have caused the damage in some of the leafs of this pothos? Fungus? Drought? Pest? Factors: It appeared suddenly, at the end of winter time, beginning of spring It is an indoor plant, ...
8
votes
4answers
38k 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 ...
5
votes
2answers
792 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 ...
7
votes
1answer
58 views

Can I use waste water from kitchen for plants? [duplicate]

Can I use the waste water mixed with dish washing liquid from kitchen for watering my garden?
5
votes
0answers
38 views

Unhealthy plant with dark spots on leaves

See attached plant. Leaves seem to have some issue as identified by dark spots. Any idea what could be wrong?
5
votes
2answers
78 views

Is powdery mildew spreading through my garden?

I noticed this white fungus a few weeks ago on some flowers in my garden which I ignored. But now it's appearing on my zucchini leaves. I was under the impression the fungi are plant specific, but ...
8
votes
1answer
95 views

Is this powdery mildew on my tomato?

Just noticed this on my store bought plant (not grown from seed). It's now fruiting, and I don't see any white spots on the leaves. Update: 25 Feb 2016 with close up of the stems and an more ...
5
votes
1answer
86 views

Why are the leaves on my capsicum plant curling and turning brown?

Does anyone have any idea what's happening to my capsicum plant and what I should do about it? There are no visible bugs on the leaves.
9
votes
2answers
170 views

Why are the leaves on my houseplant turning yellow and getting black spots?

I have this shade plant in my home. The leaves are becoming dry, turning yellow and developing black dots on them. I don't know whats wrong with it. If it's a lack of food, I can give it compost, ...
4
votes
1answer
538 views

What is causing the brown-black spots on my apricots?

I've recently bought a house in the Auvergne region of France (South central) which is about 30 years old and that has the good fortune to have several mature fruit trees in the garden (cherry, apple, ...
7
votes
2answers
87 views

How to treat diseases and bugs on peach tree?

I have a young peach tree (18 months old, never gave fruits) in my yard in Florida that recently lost all its leaves. The leaves are eaten but also covered with brown spots. I'm wondering if the issue ...
7
votes
1answer
155 views

Kentia palm dying. Advice? :(

I bought a kentia palm some months ago, and during the last week one stem/group of steams is turning out yellow. Also there are some big white stains on the leaves. Some leaves also have small white ...
5
votes
2answers
144 views

How to treat a Jade plant with yellow leaves and holes in its leaves?

My succulent has developed some weird disease, first it only looked as if something was eating it but then the leaves started turning pale and yellow.. I never fertilize it and I irrigate it once a ...
4
votes
1answer
2k 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 ...
4
votes
1answer
69 views

How to Control Tomato Hornworms?

I've sprayed my plants with DiPel DF as a way of controlling Tomato Hornworms. (The Dipel Solution called for 2 to 4 teaspoons per 32oz of water.) It killed the hornworms effectively; however, it's ...
4
votes
1answer
57 views

Is this sunburn or something else?

I've put my cacti for wintering into an unheated attic, by a window where the sun falls after 2 P.M and till dusk. Since it's negative temperature outside (so it's already winter in a sense) I didn't ...
8
votes
2answers
149 views

Is my mint plant dying or diseased?

About a week ago I decided to propagate a healthy stalk of mint that I had bought from the grocery store. The roots appear to be healthy and full, but two of the leaves appear to be abnormal. One of ...
4
votes
2answers
2k 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 ...