For questions about plant diseases.

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10
votes
1answer
9k 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 ...
6
votes
2answers
93 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
37 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?
3
votes
0answers
42 views

Is my mint plant dying or diseased?

So 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 ...
3
votes
1answer
19 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 ...
4
votes
1answer
63 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
105 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
86 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
59 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
121 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
39 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
31 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
13k 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
289 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
34 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
35 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
31 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
105 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
56 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
5k 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
26 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
106 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
56 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
142 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
43 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
78 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
80 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
212 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
56 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
74 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
563 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
55 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
170 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
148 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
42 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
169 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
128 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
426 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
5k 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
67 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
86 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
183 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
122 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
653 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
184 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
142 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?