Gardening & Landscaping Stack Exchange
Gardening & Landscaping Stack Exchange

Questions tagged [mildew]

20 questions
7
votes
2 answers

what are these white spots (?tiny creatures) effecting my japanese parsley (honewort)?

They come off when rubbed (although not all of them) and are slightly waxy but I don't think it is honeydew, mildew or whitefly?
James
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6
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Are these Holly tree leaves affected by White Mildew?

I just noticed that one of my Holly trees has some leaves with white tips like these: It doesn't quite match pictures I've seen of White Mildew online, but I've never noticed this before so wanted to determine if this was anything serious. My…
Derek
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Powdery mildew on oak (Erysiphe alphitoides?)

I have an oak (Quercus robur) sapling I've grown from seed in a pot (it is 2 years old) and its leaves are exhibiting a powdery white mildew. After some searching online I think it's a case of erysiphe alphitoides (it looks exactly like the…
Matt Hogan-Jones
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4
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Is there mold or mildew growing in/on my Kalanchoe?

I picked up a Kalanchoe at the beginning of the summer without knowing anything about their care. I ended up over-watering it at first, which made it leggy and it grew many smaller leaves than it originally had. But the mystery to me is a dusty…
Dave Cameron
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4
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Diagnosing white fuzz on kale. Is this powdery mildew?

I think I'm dealing with powdery mildew, but I want to confirm that diagnosis. Context: I'm in Portland, OR. I've got several raised beds with a couple kinds of kale, broccoli, brussels sprouts, some beans, cucumbers, and few other things. The soil…
emersonthis
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How effective is neem oil as a preventative measure against powdery mildew?

I regularly use neem oil in my garden to help suppress the presence of white flies, aphids and certain soft-body caterpillars. I'm curious if neem oil can be effective in addressing powdery mildew on cucumbers or pumpkins. I'm in NY zone 7a and grow…
JRap88
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3
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Avocado plant problem

My avocado plant has a strange mildew on some of its leaves. Not sure what it is or how to treat it. Anyone know what the problem is?
Nicole
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is this powdery mildew growing on my young carrots?

I can't tell if this is powdery mildew as it doesn't seem powdery and is instead concentrated blobs of white. It also doesn't come off when I wipe it, unlike the videos I've seen. The leaves are still young and haven't had time to fully develop…
Craig Ratcliffe
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White Spots on Hoya Image - What are they? How to treat?

I adopted a fairly large (neglected) Hoya / Wax plant and ever since its been in my care it has had dappled white spots on the leaves. I always assumed these were the way the leaves grew - until a few minutes ago when I noticed that I could rub…
davidgo
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How can I treat powdery mildew

I have a grape vine in my garden and each summer it starts off fine but then Powdery mildew seems to kick in as the summer progresses. Is there a way I can treat it?
Dave Hall
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Does it make any sense to heat soil in an oven in effort to kill pathogens?

So this year, a lot of my inside potted plants got attacked by powdery mildew and other afflictions. All affected were previously given soil that I sifted from the composter that is on the porch of our building. Likely, some people in the building…
Tomáš Zato
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What are these white spots on the leaves of my fig tree?

I have a fig tree in my flat and some white spots have appeared and get more and more numerous and spread more and more over the leaves. It is not removable when rubbing with a tissue. I can't find what it is, it does not seem to be common on fig…
Noil
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Is having moss in your terrarium similiar to a layer of activated charcoal?

I am making a terrarium and almost everywhere (on the web) it says to add a layer of activated charcoal between the soil and drainage rocks. I plan on creating a sort of 'meadows' look by making small hills and planting it with moss then adding a…
user16651
1
vote
1 answer

Should I be Concerned About Mildew, etc. on Mulch?

Sadly, the brand names for bagged mulch found in the "Big Home Improvement" stores are pretty low quality nowadays. I put down some recently in my garden bed and almost immediately after a big rain noticed what I assume is some sort of white powder…
AA040371
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Why does this zz plant have white residue and holes?

My ZZ plant has developed a thin white residue and holes on some of the leaves. We have had the ZZ plant about a month where it sits in a corner of the bedroom by a window. We have watered it once in that time. What might be the problem? And how do…
Peter Hickman
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