29 votes
Accepted

Why did my sweet corn kernels grow into this?

That's corn smut, a fungus. It's edible and a part of Mexican cuisine. I doubt that you need to notify the authorities, but given that USDA has been trying for decades to eradicate it in the US, it's ...
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  • 13.8k
19 votes

What is this green-ish thing inside the orange?

Preface: This answer is based solely on the search result. I'm not a gardener and I don't have any gardening knowledge to sufficiently answer this with full certainty. Looking at the picture, it ...
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  • 293
16 votes
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What are these brown, cap-shaped mushrooms on my birch tree?

Those look like Birch Polypore, scientific name Piptoporus betulinus. This mushroom is global but found almost exclusively on birch trees. The polypore is called "saprobic," which means it feeds on ...
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12 votes

What is this green-ish thing inside the orange?

Definitely looks like something from a sci fi/horror movie! Black areas within oranges are usually caused by a fungal pathogen - it enters most often at the 'navel' end of the orange and then spreads ...
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  • 129k
10 votes

Sudden Outbreak of Yellow Leaves on Tomato (and Other) Plants

That is Early Blight, Alternaria solani. The earlier you treat, the better the control, as a strong infection will build up resistance to the fungicide. Here's what to do: Remove all leaves showing ...
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  • 51.5k
10 votes
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How do you manage dying leaves on young plants?

The only time you usually remove leaves which are slightly damaged or part dead is if the plant is highly ornamental and it's detracting from its appearance, or the leaf is damaged by some kind of ...
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  • 129k
10 votes
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Why do my Cherry tomatoes split as they ripen?

Small fruiting tomatoes tend to be a lot juicier (that is ratio of meaty pulp to juice) than medium or large fruiting. Tomato produces a skin of a certain size for the number of fruits it has, then as ...
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10 votes

Why do my Cherry tomatoes split as they ripen?

There are two main causes of fruit split - the first is irregular watering. Once tomatoes have fruitlets, and especially as they start to get bigger and ripen, its critical to water sufficiently every ...
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  • 129k
9 votes

What are these abnormal tomatoes on my tomato plant?

This looks like blossom end rot. Here is another source of info. According to the second link, which is from Clemson University: After tomatoes are planted, gardeners can minimize the potential ...
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  • 6,947
9 votes

What's wrong with this fig?

Those white dots are spider mites. There are a lot of them so you will need to apply at least three treatments of soap and water at a rate of 5 ml /liter at five to seven day intervals. This will ...
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  • 56.2k
8 votes
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How to heal this needled plant?

This is a dwarf Alberta spruce (Picea glauca conica). They grow slowly and burn easily if sited so they are exposed to cold winter winds. Sadly almost all of eastern North America was subject to very ...
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  • 56.2k
8 votes
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What causes cucumber leaves to turn yellow, brown, wilt, die, and the plants to stop producing?

I think you have Cucumber mosaic virus, because of the mosaicing, curling, and drying of the leaves, and the stop in production, plus the time frame of infection matches perfectly. There is no cure. ...
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  • 51.5k
8 votes
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How far apart do raspberries and blackberries need to be planted?

The likelihood of disease is not more likely when planted in close quarters, but if one species contracts a disease, it will likely pass it on. To avoid this, planting them apart should do it, ...
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  • 51.5k
8 votes
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Can rubber gloves spread plant diseases?

It's certainly possible to spread some fungal infections on gardening gloves and tools you may have used. Given you're wearing rubber gloves, after handling diseased plant material, its sensible to go ...
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  • 129k
8 votes
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What is this Apple disease?

Probably Apple Scab, which is an issue where you are, as it is in many parts of the world. It's caused by a fungus, and it affects the twigs behind the fruits and often the leaves too. Some info in ...
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  • 129k
8 votes
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What disease is causing raised blisters on the leaves of my plant?

Alstonia scholaris (L.) R. Br. is a very beautiful ornamental tree, which is commonly known as pagoda tree because of its pagoda like growing habit. It is commonly infected by the Homopteran, ...
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8 votes

Need help identifying this disease for my lemon tree

Looks like you have at least two problems. Let's take the last image first which appears to show Citrus Leaf Miner damage. You can see the channels that the miner has burrowed into the leaf. The ...
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7 votes
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Why did my red bell pepper become tan colored?

It looks like it could be Sun scalding to me. I have seen it on one of my chili peppers as well. Sunscald on peppers occurs in the high heat of summer when humidity is at a peak. Usually the ...
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  • 496
7 votes
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What are these white streaks on my tomato plant?

Leaf miner infestation. Leaf miners differ round the world, as does any possible treatment available, though most treatments are relatively ineffective because the miner is within the leaf. You may ...
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  • 129k
7 votes
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Tomatoes...what is the difference between early blight and late blight?

Here's the biggest difference: Late blight is caused by the pathogen Phytophthora infestans, while early blight is caused by Alternaria solani. Phytophthora infestans is an oomycete, a fungus-like ...
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  • 51.5k
7 votes
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What are these reddish-brown growths on my succulent plant?

Scale infestation - brown scale in fact, not that it matters. If you've got some rubbing alcohol or some methylated spirits, dip a cotton bud (Q tip) in and rub off the scale from the stems, being ...
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  • 129k
7 votes
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Should I rotate border vegetables, or plant a perimeter of onions/scallions each year?

In my experience, planting onions etc around the perimeters isn't very effective. On the other hand, rotation is not only effective, but necessary for a good Integrated Pest Management (IPM) system. ...
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  • 51.5k
7 votes
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Grapes leaves too dry - is that normal?

Bacterial leaf spot infection. There is no cure, but you can try to avoid it next season. Here are some tips: Cultural: Clean up and burn/landfill fallen leaves/fruit. Don't compost. Loosen the ...
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  • 51.5k
7 votes
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What is the white, powdery, substance on my hibiscus?

This is most likely to be a cottony mealybug. You can control this taking a paper towel soaked in dish soap and water and wiping the leaves down. Repeat for every leaf with the symptoms. Check the ...
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  • 56.2k
7 votes
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How to treat diseases and bugs on peach tree?

Peach trees are deciduous and lose their leaves in the winter, so don't worry about that. The leaves can turn gold/brown before they drop. Some munched leaves on a healthy tree are not a problem. ...
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  • 1,057
7 votes

Why are the leaves on my houseplant turning yellow and getting black spots?

Your plant appears to be an Areca palm which is now known as Dypsis lutescens. This looks like a combination of factors: overwatering promotes anerobic conditions in the soil which promote fungus. ...
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  • 56.2k
7 votes
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Orange spots on Polypodium

I can't get a close enough image to examine the spots thoroughly, but because they're evenly spaced, its most likely these are sporangia, or spore cases. It's a sign of a healthy plant and the spores ...
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  • 129k
7 votes
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What is wrong with this magnolia?

The light green areas are chlorosis, often an indication of iron or manganese deficiency. Magnolias are very quick in developing chlorosis if they don't have enough iron available - typically not ...
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  • 15.5k

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