For questions about plant diseases.

learn more… | top users | synonyms (1)

10
votes
1answer
613 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 ...
12
votes
5answers
3k 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?
11
votes
2answers
12k views

Brown Spots on peppers

I have been growing peppers this summer and they have been doing great. The fruit is really starting to take off, but now I have 3 or 4 of my larger fruit getting these brown spots. This is a Red ...
4
votes
1answer
62 views

What are the black spots on my paw paws and how do I treat them?

I have six paw paw trees, all of which were going fine, then almost all together started to develop these black spots on the leaves and fruit. It has progressively gotten worse, and caused most of ...
2
votes
2answers
42 views

Diseased roses: salvagable, or a danger to my other plants?

This poor potted rose bush (don't know the type) has just been getting worse and worse: Clearly a disease, but what? Can it be saved? I've already pruned 2 branches that had basically died, but ...
4
votes
1answer
37 views

Controlling curly top disease in sugar beets

Last season, curly top virus caused a significant decline in the quality of sugar beets grown in my garden as well as tomato. The steps I have taken so far include spraying with a preventative ...
0
votes
0answers
11 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 ...
3
votes
0answers
30 views

fig tree disease or just malnourished?

Hello you fellow earth lovers, My folks in Berkeley, CA (San Francisco Bay Area) showed me their young fig tree the other day to see if I could figure out what was wrong with it, but I wasn't ...
1
vote
1answer
32 views

Is this Fusarium Wilt or nutrient deficiency or something else?

My basil plants have recently started spotting on the leaves with a couple yellow leaf drops and streaking on stems. Is this a disease or some other issues? Full Gallery of photos A few details: ...
3
votes
3answers
143 views

What's wrong with my tomato plant?

This is a Great White plant, planted about 30 days ago. It has yellowing leaves with black spots, all tge leaves are drooping, and there are very few flower buds. I'm afraid I might need to dispose of ...
4
votes
1answer
68 views

Raspberry leaf curl disease? Can this be treated or prevented?

About a 1 1/2 months ago I ordered and received a live raspberry plant from Burpee. Burpee lists the plant as Crimson Night Raspberry PPAF. My understanding is that this raspberry is a variety ...
0
votes
2answers
33 views

Biological degeneration due to inbreeding among plants?

Is there such a thing as biological degeneration due to inbreeding (incest) among garden plants? For instance, if the quality in a bed of calendulas diminishes somewhat year-after-year, could this be ...
4
votes
1answer
76 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
1answer
54 views

What methods can be used to apply an antifungal to the interior of a tree?

Diseases such as the Blue Stain Fungus infect trees from the inside out due to inoculation by host insects. Are there any effective/standard methods for applying antifungal compounds to infected ...
6
votes
2answers
99 views

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, ...
4
votes
1answer
61 views

Rose bush diseased or natural (new growth or rose rosette?)

We were told the red leaves on this rosebush indicated disease and needed to be trimmed. Can anyone confirm or explain?
4
votes
1answer
80 views

What has caused this strange growth on my euonymus?

We have an otherwise apparently healthy euonymus in our garden, but a couple of branches have gone very pale, wide and flat with tightly bunched stunted leaves on the end. What causes this and is it ...
4
votes
2answers
206 views

Black spots, curling leaves on potatoes, help identify problem

First, some relevant information: I am growing Yukon Gold potatoes. I am in hardiness zone 6b. The weather over the last month has been dryer than normal for the area I am in (Northeastern US). I ...
4
votes
1answer
138 views

What is the white 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 looks powdery, substance on the branches ...
2
votes
0answers
86 views

What is causing brown spots on my mint plant?

I have been rooting my mint in water and it rooted, then I found those brown spots appearing. It happened with all the mint plants I had before. I am in Egypt, and it gets morning sun and no afternoon ...
4
votes
3answers
141 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 ...
12
votes
3answers
4k views

Why have my tomato leaves started yellowing at the base?

One of my tomato plants (Better Boys if that matters) has a few leaves that have started yellowing on the lower branches. Not sure if they aren't getting enough water, or if they are diseased or what. ...
1
vote
0answers
44 views

My large pine tree is indenting at the bottom of the trunk

My large pine tree is starting to indent near the ground. The bark in some spots can be pulled off easily. The pine tree is the type that branches out. What could the issue be ?
5
votes
2answers
3k 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 ...
2
votes
1answer
33 views

Can Psorosis spread via the soil?

My citrus tree has Psorosis, and I am thinking about cutting it down and putting a new tree in its place. But I am concerned that the disease will spread via the soil. Does Psorosis spread through ...
16
votes
7answers
14k 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 ...
2
votes
1answer
430 views

What is wrong with this tomato plant with yellow and black spotted leaves? [picture]

What is wrong with this tomato plant? The yellow with black spots has been spreading through the plant. I am hoping someone knows exactly what this is and how I can treat it or prevent it.
2
votes
0answers
43 views

White map-like tomato leaves (hydroponic) manifesting

I am growing cherry tomato using kratky hydroponic method and ive seen these map-like lines manifesting on a number of leaves. I had to remove the infected leaves to control the infection if you will. ...
3
votes
2answers
37 views

Why did these plants dry/burn?

I bought a small venus fly trap kit to sow. Three of them sprouted and they were growing well. I had placed them at a south facing window, watering them every few days. I found them like this a few ...
2
votes
1answer
56 views

Tiny black flecks on squash and okra

What are tiny, size is the size of a tip of a needle, black flecks on squash and okra plants? What needs to be done to save the plants?
1
vote
1answer
125 views

Why would one tomato plant be full of tomatoes and the other one be empty?

I planted two tomato plants in my first garden and one has developed about a dozen green tomatoes ranging from marble-sized to 3/4 tennis ball-sized but the other, same exact species, has no tomatoes. ...
1
vote
1answer
62 views

Is this a desease or pest on my pepper-seedlings?

Today I noticed on my pepper seedlings that some of the leaves have on their bottom-side close to the steam some light-green-dots. To my uneducated eyes this looks like something is hatching inside ...
4
votes
6answers
6k 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
27 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
150 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 ...
5
votes
2answers
57 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
203 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
48 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
105 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
113 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
226 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
65 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
81 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 ...
4
votes
1answer
66 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
2k 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
195 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
172 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
55 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
184 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 ...