Sudden Brown Patches on Basil and Mint

bhammie85(10a St. Pete)July 28, 2014

Hi all,

I have noticed a sudden proliferation of brown spots on my basil and chocolate mint plants and it has appeared in the last 2 days. I've attached some photos; any ideas of what to do?

Other info:
- plants are outside, lots of sun.
- haven't fertilized recently
-doesn't look like fungus/fuzzy
- only water when they start wilting
- have had a decent amount of rain lately (in St. Pete) but they don't sit in saucers so shouldn't be waterlogged
- have been battling against white flies and leaf miners for a couple months but this is the first time I've seen this happen
- I've been gardening for a year so I have a little familiarity with other things that would kill them (tomato leaf curl virus, mites, terrible FL soil, etc) but I'm guessing this is another virus or bacterial infection

This is affecting 3 kinds of basil and the chocolate mint, but not my sweet mint or rosemary (yet). My chard has also been looking weird lately so I have a photo of that as well.

Thanks for any help!

Here is a link that might be useful: Dropbox link to photos

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Gator99

I've seen this before on my basil, but not to this extent. Basil is so easy to grow, I'd almost say to throw the plant away and start over. I have accidentally planted a healthy basil plant at least once. But I am a novice gardener so I defer to others in the forum.

    Bookmark   July 29, 2014 at 8:40AM
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carolb_w_fl(zone 9/10)

If it were not summer time, I say that looked like frostbite. Perhaps something caustic spilled, sprayed or other wise got on those leaves?

Hmm - quick image search for 'diseases of basil leaves' suggests it may be a mildewâ¦.

This post was edited by carolb_w_fl on Tue, Jul 29, 14 at 10:21

    Bookmark   July 29, 2014 at 10:12AM
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chinchette(9b)

I have the same thing. Already have tossed it and started over and got the same thing.

    Bookmark   July 29, 2014 at 11:20AM
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coorscat(6 and 9)

I am down in south Florida and I get this almost every year during the rainy season. It is some form of blight. If the leaf is really bad, I remove and wrap in plastic and throw away. If it is just a spot, I pick the leaf, pick off the spot and then use the leaf in the kitchen.

    Bookmark   July 29, 2014 at 3:09PM
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bhammie85(10a St. Pete)

Thanks everybody for the feedback.

carolb_w_fl I saw that mildew photo and my leaves aren't fuzzy, just dying on those brown spotted areas. I also haven't been spraying anything - and no changes to the soil or how I water them.

coorscat, I was thinking it might be something like that. It's affecting most of my plant (the genovese one, though not as bad on the other basil types) so if I pick off the bad leaves I'll lose all the leaves. I may try to cut it all the way back to see if it will make a comeback though.

I did a little more research and it looks like it might but fusarium wilt or late blight, both of which are a bummer.

Anyway, if anybody has any more ideas of how to treat it/avoid it, I'll take suggestions!

    Bookmark   July 29, 2014 at 6:32PM
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chinchette(9b)

Did you have any lucK?

    Bookmark   August 16, 2014 at 10:33AM
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bhammie85(10a St. Pete)

Chinchette, whatever it was eventually stopped after a week or so. The plants look pretty scraggly now but I cut them back so hopefully that will spur some new growth. They look a little stressed (the leaves are a little curled), but that's to be expected. So I suppose in this case my only advice would be to wait it out.

Thanks!

    Bookmark   August 16, 2014 at 12:37PM
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chinchette(9b)

Mine are pretty much dead. Ty basil does okay for me.

    Bookmark   August 17, 2014 at 10:12AM
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