Questions tagged [diagnosis]

Gathering of information and facts to determine the root cause of a plant that is failing to thrive.

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10
votes
1answer
250 views

Jade: Can I repot and/or take cuttings?

I've read other questions on this and other forums on Jade plants, and haven't quite found an answer. My Jade plant is 20 years old and about 3" in diameter at the base and 4' high. It seems to never ...
8
votes
1answer
8k views

Zucchini leaves yellowing - but not powdery mildew

I have about 8 zucchini plants, about 6- 8 weeks along, which are starting to show signs of disease on the leaves. It's definitely not powdery mildew, but the end result is quite similar. Leaves are ...
12
votes
2answers
4k views

How can I revive wilted water basil plants?

I bought these basil plants from the store. They looked a little droopy and wilting. They came with several bunches and they were half off and discounted because they've been there in the store so ...
15
votes
1answer
1k views

What are these red cocoons in my trees leaves?

The tree In my garden as lots of red cocoons on its leaves, I assume these are insects, do I need to be concerned or are they harmless?
9
votes
1answer
2k views

What is this discolouration of the skin of my pepper?

One of my peppers is showing some strange discolouration of its skin. You cannot feel that it's there, so presumably this is underneath the outermost membrane of the fruit. As far as I can tell there ...
19
votes
2answers
12k views

Why are my apples rotting on the tree?

I recently bought a home that has an apple tree in the backyard. I don't know much about apples (or gardening in general for that matter) and I need help with a couple of things. I'd like some help ...
15
votes
1answer
531 views

Why didn't my forsythia cuttings root?

In May, I took some greenwood forsythia cuttings, dipped them in a hormone rooting powder and planted them in rooting mix. The mix was kept moist all year. I had thought they had rooted because they ...
7
votes
1answer
90 views

How do I control blight in lantanas?

All my Lantanas have this blight on their leaves. What is causing it and how can I cure it?
12
votes
2answers
1k views

What is the problem/disease that causes bobbly peach tree leaves?

What is the likely cause of the bobbly forms on the leaves of a peach tree? Does it matter or is it just some natural anomaly that doesn't affect the tree's health? If is it a concern how can it be ...
17
votes
2answers
6k views

Why did my orange bell pepper smell of ammonia?

A week ago I harvested an orange Bell pepper from my garden. It was still halfway green, so I put it on our kitchen counter to ripen. When I finally cut it open for a salad after a week of ripening, ...
11
votes
1answer
371 views

Why are my persimmons black beneath the hull?

My mother's persimmon tree is producing fruit that tastes good, but the area at the top beneath the leaves (the hull/calyx) is black. The local nursery suggested the fruit may be getting too much ...
12
votes
2answers
10k views

Why are my squash's leaves drooping?

This past growing season (2011) I was growing squash. Often I would find that the leaves had drooped (lost rigidity). Watering the plant seemed to help; but I'm not sure if there is a causal link ...
12
votes
1answer
13k views

Are the yellow leaves on my Massangeana due to root rot?

I bought my Massangeana (Dracaena fragens) 15 months ago, and he's be doing really well. Started off with a few burnt ends, but I switched to filtered water and he was good again. In the last couple ...
7
votes
3answers
3k views

Cherry sapling has wilted leaves, dried trunk; is it dying?

I've posted earlier about my diseased cherry seedling. Since then, all the leaves have wilted and curled to some amount and the trunk of the seedling itself looks like a dried stick. Is this tree ...
11
votes
1answer
3k views

Why did the stem suddenly weaken in my oriental poppy?

I have an oriental poppy 'Patty's Plum' growing in new potting compost in a pot with good drainage. It sits in full sun, and I water it as needed in the recent dry weather. I purchased it from a ...
3
votes
1answer
529 views

My plants are dropping leaves suddenly and dying. Are they being poisoned?

We have got a Japanese maple plant in the back garden in a pot that has suddenly seemed to have died. There are absolutely no leaves on it at all now. I asked my dad who said this is perfectly ...
9
votes
2answers
3k views

Why are my basil seedlings failing to thrive?

I have grown basil from seeds in a large pot. They have germinated but are now failing to thrive. They are now about 3 weeks old. They get the afternoon sun and are watered daily. I applied Seasol a ...
15
votes
1answer
2k views

Strawberry plants brown & brittle - is it disease, climate conditions, or bugs?

Most of my strawberry plants have leaves that first turned red, then brown and brittle. Leaves often snap off when harvesting what berries remain after the critters get them. I'm trying to balance ...
19
votes
2answers
1k views

Why don't my radishes swell up?

When I grow radishes, I find that some of them don't swell up to form the globe I expect; instead the root stays thin. These are planted in the same bed and at the same time as radishes that do swell....
5
votes
1answer
2k views

Why did my grape hyacinths put out leaves in the fall?

Normally my grape hyacinth only puts out leaves in the spring, but this year they all are vigorously growing leaves in the fall. Why do they do that? Is it diagnostic of a problem?
10
votes
1answer
5k views

Why didn't my maple leaves change color in the fall after transplanting?

I just bought and planted an October Glory maple sapling with a trunk about 1.5" in diameter. I did everything the nursery worker told me to while transplanting it: I dug a hole twice as wide as the ...
10
votes
1answer
1k views

Why does my sweet potato have stunted growth with wide, flattened stems and dense leaves?

My sweet potato plant has a severely widened and flattened stem and grows like a band, with dense leaves and stunted growth. What is wrong with it?
12
votes
3answers
2k views

Cherry sapling has orange dots on its leaves and the tips are wilting. What could be wrong?

I recently planted a cherry tree sapling about two weeks ago. It's about a handspan high, and has four leaves. I noticed that it had orange spots on one of the leaves when I planted it. Click on the ...
6
votes
2answers
4k views

Why does my English walnut lose its leaves early?

I have an English walnut sapling that grows vigorously all summer, but at the beginning of Fall the leaves dry up and fall. It has been two years now. Is that a problem with the tree?
9
votes
1answer
5k views

What are these red spots on the leaves of my boysenberry plant?

Previously, I had issues with the sun scorching the leaves of my berry plants. Now that the heat has cooled down, those leaves are back to normal. However, a lot of the leaves on my boysenberry plant ...
13
votes
1answer
4k views

How do I prevent my berry leaves from getting scorched in the sun?

Raspberries are plants that require good exposure to sun. However, my black-raspberry plant has been getting scorched of late. Typical signs of sun-scorching are when the older leaves start drying out ...
9
votes
1answer
267 views

Why does my sinningia have yellow spots?

Click below images to enlarge... This is probably Sinningia Ozark Coral Freckles. I put it in a aquarium with artificial light on from 8:00am to 0:00am. The distance to light is about 20cm. The ...
11
votes
1answer
2k views

Why are the leaves of my pea plant (little marvel) drying up and turning brown?

The pea plant (Pisum sativum) was grown in an ebb & flow hydroponics system until it failed; now it's in a deep water culture unit. I noticed that the leaves were turning brown/grey. I thought ...
10
votes
1answer
2k views

What insect eats petals and what can I do to kill it?

My geraniums loved being outside the front window of my house. They've been thriving there for over two months now and I thought I'd finally found a winner (it's too hot for pansies and other daintier ...
15
votes
1answer
13k views

What does it mean if my tomato leaves are curling?

The leaves on my tomato plants are curling up and I'm wondering if they are getting enough water. The leaves are still green and there are tomatoes on the plant, but I didn't know if that was a sign ...
11
votes
1answer
516 views

What is this anomalous growth on my oak leaf?

I found an interesting lesion on an oak leaf in my back yard (Upstate South Carolina). What is it? I am asking about the marble like structure since I am fairly certain that the larva (shown at link) ...
10
votes
1answer
834 views

Why is my phalaenopsis' keiki (orchid) not thriving?

About five years ago, I bought a fully grown and blooming Phalaenopsis orchid. After a month or so, the blooms fell off as expected. I continued to care for it as directed, but it never flowered again....
8
votes
1answer
2k views

Why do my gardenias turn yellow before they bloom?

My gardenias seem to be happy all year around, but when they bloom, they turn half yellow. Is there a way to keep them green through the bloom phase?
12
votes
1answer
5k views

What are these blemishes on the skin of my bell peppers?

I've noticed the following on two of my oldest bell-peppers, also called capsicum (the third pepper of that "batch" had almost finished going red and ripening instead): It's not "on" the surface - I ...
14
votes
1answer
2k views

What's causing my potatoes to wilt?

I'm growing yukon gold potatoes. They've been growing like gangbusters, but this week I noticed some leaf yellowing and wilt on at least 3 plants out of 9. Why are they yellowing? Is it anything to ...
14
votes
1answer
11k views

Why are my peach leaves turning orange?

During summer, the leaves on my peach tree turn an orange-green shade. Is this normal? Is this a response to heat stress, drought, or something else (e.g. mineral deficiency during high heat ...
16
votes
1answer
2k views

tomato plant rotting from the inside — what's going on?

I have a hydroponic garden in a greenhouse in my yard. Everything was going just great until today when I noticed that one of the 7 or so tomato plants (the biggest one in fact) was looking rather ...
22
votes
3answers
13k views

Insect infestation on my pepper plant, what do I do?

I have spotted that one - and only one - of my peppers plants has a number of small black flies of some type hanging around the soil. And while writing this I've just spotted that one (and only one!) ...
17
votes
1answer
2k views

What's growing on my tomatoes?

My tomato plants are covered with tiny, pill-like growths on their stems, pictured below. They're about 1mm wide and 3-4mm long, and they're widespread on both stems and branches. I'm also getting an ...
14
votes
2answers
2k views

What can cause the leaves of a rose bush to turn black and fall off?

I bought a small rose bush on Mother's Day this year and planted it in my flower garden. The area probably has too much shade for a full sun plant, but I don't think that is the issue here. Shortly ...
10
votes
2answers
3k views

A few leaves on my peppers are showing multiple small holes, should I be worried?

I've noticed that a small number of the leaves on my pepper plants are showing several tiny holes through their surface. These are focused towards the stem of the leaf, and not so much towards the ...
7
votes
1answer
2k views

Holes on bottom side of tomato [duplicate]

Possible Duplicate: Cracks on Bottom Side of Tomato This may be related to my prior question about cracks on the bottom side of tomatoes. A few plants I'm growing have appeared with holes on the ...
12
votes
1answer
4k views

Is my lemon tree dying?

I'm on my 2nd lemon tree. I live in Melbourne, Australia and lemon trees are the norm around here. I suspect my first one died as it outgrew its pot, which was half the size of this one. I'm ...
11
votes
1answer
6k views

What could be causing rot to appear on the skin of my bell peppers?

I have a set of four bell pepper plants that I am growing in 12" containers in my backyard. They've been growing alright until the fruits on the plants have started to develop what appears to be a rot ...

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