Gardening and Landscaping Stack Exchange
Gardening and Landscaping Stack Exchange

Questions tagged [diseases]

For questions related to plant diseases.

Plants can be infected by a number of diseases. These can be caused by micro-organisms (e.g. bacteria, fungi, viruses; and multi-cellular creatures such as nematodes).

Macroscopic creatures (e.g. mites and aphids) and water/nutrient problems (too little or too much) can also cause symptoms that can be confused with diseases.

Use this tag for all questions related to diseases - especially diagnosis, management, and cures. Please include pictures of the affected parts of the plants.

816 questions
7
votes
1 answer

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 they've woodened. I sprayed them with garlic…
randomshinichi
  • 173
  • 1
  • 4
7
votes
1 answer

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 infected. The tomato potato psyllid (TPP) arrived in…
Graham Chiu
  • 23,044
  • 5
  • 36
  • 92
7
votes
2 answers

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 growing since last year. It seems to have grown most…
Skooba
  • 445
  • 1
  • 8
  • 20
7
votes
1 answer

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 spots which I can imagine are mealybugs. The…
crom87
  • 253
  • 1
  • 3
  • 5
7
votes
2 answers

To prune or not to prune tomato's lower leaves?

I battled early blight last year, so this year I laid down a thick bed of grass clippings as mulch in my raised beds to prevent splashing of the dirt onto the plants. Last night, simply out of habit, I used scissors to cut off the the lower leaf…
Evil Elf
  • 2,932
  • 3
  • 21
  • 29
7
votes
1 answer

What is the white, powdery, substance on my hibiscus?

We live in Southwest Florida. About a month ago, or maybe a little longer, I trimmed back our hibiscus plants. Today, I just noticed this mass of white, almost powdery, substance on the branches and leaves of one of the plants. What is this, and…
unkfrank
  • 639
  • 1
  • 4
  • 9
7
votes
1 answer

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 the photos. Do I need to give it more water? Add…
user1249170
  • 379
  • 3
  • 10
7
votes
1 answer

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 rip out my mint every year and replant it from…
FuzzyChef
  • 727
  • 1
  • 7
  • 15
7
votes
1 answer

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 planted in May and were growing well until two weeks…
Prav
  • 329
  • 4
  • 9
7
votes
1 answer

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. This is accompanied on some leaves by small hard…
Dean_0
  • 283
  • 3
  • 6
7
votes
6 answers

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 this was the plants reacting to being moved into…
Brian Surowiec
  • 1,877
  • 3
  • 19
  • 40
6
votes
1 answer

What is this disease attacking the leaves of most of my plants?

more than half of my plants (total about 100, from a wide variety of plant families, all on a large balcony) are affected stems, roots, flowers and fruit show weak growth but no direct sign of the disease what could be causing this? how do i…
ekiwieu
  • 63
  • 2
6
votes
0 answers

What are these spots with yellow halos on my cucumber leaves?

They've been growing for 3 months so I assume they're at the end of their lifespan- but I want to identify this. Is this a disease or just some sun beating down on it?
brandon
  • 513
  • 2
  • 7
6
votes
1 answer

Ring around the collar?

I have an English walnut that is approx. 5-6 years old. There is a White fungus growing in the collar from a branch I removed. Is it harmful or caused by moisture? The tree is 20 feet tall and is bearing nuts. In the state of Wisconsin.
Sue Will
  • 86
  • 4
6
votes
1 answer

Does it make sense to spray a soccer field for ticks?

I work at a school in an area with a high incidence of tick-borne diseases (even the one that makes you allergic to red meat!) and some parents have asked the school to spray the grounds for ticks. I don't believe this is necessary for the following…
That Idiot
  • 6,997
  • 4
  • 29
  • 52
1 2 3
…
54 55