For questions about plant diseases.

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7
votes
2answers
45 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
31 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
0answers
31 views

Is this powdery mildew on my tomato?

Just noticed this on my store bought plant I.e. not grown from seed. It's now fruiting, and I don't see any white spots on the leaves.
5
votes
2answers
45 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
1k 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 ...
13
votes
2answers
11k 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
59 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 ...
3
votes
1answer
42 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
121 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 ...
3
votes
2answers
326 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 ...
2
votes
3answers
85 views

What is the white stuff on this cactus-type plant?

I have had this plant for more than 10 years now but I do not know its name. What is the name of this plant? The issue is that this plant has a lot of white areas, as shown in the pictures. These ...
2
votes
0answers
36 views

What is causing dark spots on my tomato leaves?

I have a couple of matchless determinate variety tomatoes in grow bags. I am from Chennai, India (hot, humid and it's monsoon time now). It's been raining the past week. I applied Monopotassium ...
15
votes
4answers
1k views

What else besides calcium deficiency could be causing tomato blossom end rot?

I've been using "Tomato Maker" (4-2-6) fertilizer, which supposedly has enough calcium to prevent blossom end rot, but I'm still getting blossom end rot on my super marzano tomatoes (no BER problems ...
2
votes
0answers
50 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.
5
votes
2answers
89 views

What is causing irregular brown sunken spots on my tomatoes?

I have been growing tomatoes in the same spot in my garden for years. This year most of my tomatoes seem to be affected by a disease which only affects the tomatoes. I prune, water & fertilize the ...
4
votes
1answer
33 views

Can rubber gloves spread plant diseases?

I use thin rubber gloves when gardening. It's autumn here in zone 6, and I'm in the process of pruning and pulling up spent perennials and all manner of wildflowers which have been growing since the ...
3
votes
1answer
106 views

The leaves of my persimmon tree are turning brown

I planted the persimmon tree last November which was about 4 years old. The tree seemed to be ok until July this year. Then, I recently noticed that a majority of the leaves on the tree have been ...
2
votes
2answers
250 views

Monstera Deliciosa plant with brown crud on the leaves

I have a pot plant with Swiss cheese kind of foliage that has got some problem possibly some sort of parasite or fungal infection, I have no idea. It's like red-brown rust that brushes off fairly ...
2
votes
0answers
45 views

Plants Fungus Infection

I am new to garden and I have a tomato plant that is infected by fungus. I would like to ask how fungus infects the plant? Does the disease affect the soil, plant or both?
2
votes
1answer
114 views

Peace lily flowers are turning black

Why is my peace lily flower turning black? It's the white flower not the green leafs that are turning black.
2
votes
1answer
68 views

What is causing the curling and brown spot on my Philodendron Congo Green?

I just purchased this plant last Sunday. I repotted it and watered it the same day. Since then the leaves have begun to curl and one of the leaves is developing a large brown spot. The temperature in ...
6
votes
1answer
94 views

Is this fig tree disease or just malnourished?

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 certain. I searched here (during title ...
6
votes
1answer
788 views

What's causing these yellow veins on my Okra leaves?

My Okra leaves have turned as shown below Is this a deficiency or a disease? How can I remedy this? Location: India. Weather In May-June: Hot! > 95F days. Current: Overcast with light rains.
2
votes
1answer
60 views

Caladium plant leaves turn yellow

I have bought a Caladium Plant last week. When I was potting her, I accidentally cut a few roots. When I saw some of her leaves wilting I associated it with my clumsy hands. But just today I noticed ...
7
votes
3answers
16k 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 ...
11
votes
1answer
719 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
4k 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
13k 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 ...
5
votes
1answer
106 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
61 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 ...
5
votes
1answer
42 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
15 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
1answer
50 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
160 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 ...
5
votes
1answer
96 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
39 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
59 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
105 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
93 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
103 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
292 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
253 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 ...
3
votes
0answers
114 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
158 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
50 views

My large pine tree is indenting at the bottom of the trunk [closed]

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
4k 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
38 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
17k 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
500 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.