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 ...
  • 16.3k
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 ...
  • 293
16 votes
Accepted

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 ...
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 ...
  • 130k
10 votes
Accepted

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 ...
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 ...
  • 130k
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 ...
  • 6,977
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 ...
  • 57.2k
8 votes
Accepted

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, ...
  • 51.6k
8 votes
Accepted

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 ...
  • 130k
8 votes
Accepted

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 ...
  • 130k
8 votes
Accepted

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, ...
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 ...
7 votes
Accepted

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. ...
  • 51.6k
7 votes
Accepted

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 ...
  • 51.6k
7 votes
Accepted

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 ...
  • 57.2k
7 votes
Accepted

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. ...
  • 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. ...
  • 57.2k
7 votes
Accepted

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 ...
  • 130k
7 votes
Accepted

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 ...
  • 15.6k
7 votes

It is good to use water of a pond to irrigate my garden?

You only need to be worried about some pathogenic e coli that can be incorporated into plant tissues. And generally these are not found in aquatic environments. The other bacteria, viruses and amoebae ...
7 votes

Treating tree disease that manifests as warts/galls/bumps on leaves

I can't tell what tree that leaf has come from, so it's difficult to identify precisely the cause of the galls on the leaf. Regardless, the vast majority of gall growths like this do not cause harm to ...
  • 130k
7 votes
Accepted

What pest is this and how do I treat it?

This is another case of "dog vomit slime mold", or Fuligo septica. It pops up unannounced, often on wood chips (which I see isn't your case here), and spreads a little bit, but in sort of a limited ...
  • 3,639
6 votes

What is wrong with my Philodendrons' stems and roots?

Looks like root rot, probably caused by an oomycete called Phytophthora (genus). Wikipedia says: Root rot can occur in hydroponic applications, if the water is not properly aerated. This is usually ...
  • 51.6k
6 votes
Accepted

Should I remove brown, cap-shaped Birch Polypore mushrooms from my tree?

Removing the fruiting bodies will not slow the damage/decay to the host tree. They do not affect the rate of the mycelium growth within the tree, and, if anything, removing the fruiting bodies will ...
  • 51.6k
6 votes

How to completely rid my potting soil/container of fungi which seems to continually attack my plants

I would also suggest that you only water the plants in the morning when the excess water will evaporate in the sunlight. I made this mistake several times with midnight watering which caused my salvia,...
  • 656
6 votes
Accepted

white material on roots of apple tree?

If the tree is perfectly healthy and is growing well, the mycorrhiza is most likely beneficial. It might mean the soil was a bit dry - this seems to make the mycorrhiza more visible, but in the main, ...
  • 130k
6 votes
Accepted

Why did these plants dry/burn?

VFT's can be tricky - being a bog plant, they like a lot of humidity, for one thing, so the tops may have simply desiccated. They also respond poorly when folks fertilize them, as they expect rather ...
  • 19.9k

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