Mildew?

[DaPeekas]

Hello all! I'm new to the form and to gardening! I've got pole beans growing and had a caterpillar attack which I just removed them and check daily. Aside from that I'm having some sort of mold or fungus issue. Is this powdery mildew? Its turning my leaves brown/yellow. I attempted to search for something similar on the forums but I can't tell.

Any help would be great!
Thanks!

[img]https://i27.photobucket.com/albums/c178/Peekas/fungus.jpg[/img][/img]

[The Helpful Gardener]

Not mildew on the underside of leaves; the spores are airborne and settle on a surface. I'm not buying fungus just yet...

I see a lot of flecks on the leaves. Get a sheet of paper, hold it under the leaf and tap, tap, tap the leaf. Check the tiny flecks. Do they move? If you smear do they streak?

HG

[DaPeekas]

Thanks for the response!

I attempted the leaf tap but nothing came off. Nothing is moving as far as I can tell.
Whatever it is is progressing...Its on the top side of the leaves. Here's another pic.

[img]https://i27.photobucket.com/albums/c178/Peekas/Leaf2.jpg[/img]

[rainbowgardener]

Not sure what it is, but it is not powdery mildew!

Could be some kind of mineral deficiency condition? Here's a website with pictures of what some (more severe) mineral deficiencies look like:

https://4e.plantphys.net/article.php?ch=3&id=289

(you have to scroll down a ways to the pictures).

What's the soil your beans are growing in like?

[applestar]

Looks to me a lot like the damage from some kind of sucking insect. Closest I've seen like that is lace bugs.

[Farmer Bob]

Hi Da Peekas,

I tend to agree with applestar. It looks like a sucking insect/s is doing the damage and I suspect that it's red spider mite. Is the plant in a very sunny
spot.? Has it been quite dry.?

Try to water from under the leaves for 3 nights in succession to wet the underside of the leaves. This will break the reproductive cycle of the mites.

If you don't mind using insecticide, then use it with caution. The active ingredient is Tetradifon. Check with your local nursery.

Hope u get rid of the infection.

Regds,
Farmer Bob

[The Helpful Gardener]

That's EXACTLY what I had Dap tapping for; you can usually see the mites a little when they fall on the paper, but they ARE really small. I usually tap and then wipe my hand across the paper. Even when they are small as mites, they tend to streak as they wipe across the paper. But I agree with the mites assessment.

Try an oil (keeping them out of direct sun while wet still). Even an olive oil will suffocate them (with sufficient dispersal). They are even starting to use mites to predate on mites; [url=https://www.planetnatural.com/site/predatory-mites.html]Phytoseiulus persimilis[/url] makes a living out of predating on other mites (it has long legs to run them down).

But I am betting on mites...

HG

[Sage Hermit]

Fill up a mist bottle and spray them off using H2O and some water pressure. Like pouring salt on a slug () spraying water to a mite.