How to treat Brown spots on Red Orange tree leaves?

Marylander2013August 16, 2013

I'm growing a "Blood" Orange tree in a container in Maryland. Recently brown spots have appeared on 4 leaves. I tend to think that this is Alternaria.

It's important to stress that a few days ago (before the appearance of the Brown spots) I discovered Slugs in the container. At the beginning I sprayed the leaves with a product for "insect, disease and Mite control" (which contains Sulfur and Pyrethrins) . After I discovered that it doesn't kill Snails, I killed them with salt (around 3-4 tea spoons overall that didn't touch the leaves). The Brown spots appeared couple of days, after I applied Bayer's product and the salt.

My questions are:
1. Can it be the result of the product that contains Sulful and Pyrethrins?
2. Can it be the result of spreading the salt on the ground?
3. Is it Altenaria or is there another possibility?
4. What is the best solution for this situation?

I enclosed a picture of one of the leaves.

By the way, in order to make sure that there are no Slugs, I used now Elemntals Slug & Snail, and I hope it will prevent any more of them.

Thank you for reporting this comment. Undo
jean001a(Portland OR 7b)

You can't treat those brown spots because some critter ate the surface of the leaf.

Those few spots are too few to be a problem. but keep watch for nibblers so that you can squish them before brown spots develop.;

    Bookmark   August 17, 2013 at 1:34PM
Thank you for reporting this comment. Undo
jean001a(Portland OR 7b)

More info.
Stop spraying before you have a diagnosis. You're wasting time & money.

A question:
Why are you putting salt on the soil? (Even though I don't know the reason I do know that it won't help anything.)

    Bookmark   August 17, 2013 at 1:37PM
Thank you for reporting this comment. Undo
rhizo_1 (North AL) zone 7

" won't help anything " and I'll add that adding salt to the soil can be damaging.

And not use any pesticide until you have carefully read and understood all of the directions. Also, home remedies shouldn't be used unless there is a good understanding of how they work, possible problems, and potential damage. Repeating jean again....don't use anything unless you know just what the problem is.

    Bookmark   August 17, 2013 at 2:18PM
Thank you for reporting this comment. Undo

Thank you very much!
I'll wait and see if more brown spots develop. Till now, it looks like they don't. Following your advises, I'm not going to do anything for now.
Regarding the salt - I used it in order to kill Snails, which are the leaves, but I'm not going to that again.

    Bookmark   August 18, 2013 at 3:26PM
Thank you for reporting this comment. Undo
jean001a(Portland OR 7b)

Flick the snails into soapy water. They will drown.

    Bookmark   August 18, 2013 at 11:00PM
Sign Up to comment
More Discussions
Ants on blossoms?
Is it okay for the Blossom/plant?
Looking for a good LED grow light
Can anyone suggest a good LED grow light to be the...
Please share recents pic of your potted citrus with us.
Here is just a few of miine larger and smaller ones.. I...
citrus trees from whole foods ID please
A couple years ago, I received a couple citrus trees...
Sunniland Citrus, Avocado and Mango Fertilizer 6-4-6
I buy this Sunniland Citrus, Avocado and Mango Fertilizer...
Sponsored Products
New One-of-a-Kind Geometric Kazak Runner 3x9 Hand Knotted Red Persian Rug H3436
BH Sun Inc
Lawrence Brown Floral Hand-tufted Wool Rug (8' x 11')
Rooster Wine Caddy
$99.00 | FRONTGATE
Home Decorators Indoor/Outdoor Area Rug: Home Decorators Collection Rugs Glitzy
$59.00 | Home Depot
Brown & Tan Wave Runner
$39.99 | zulily
Muirfield Wood 2 Drawer Nightstand - Distressed Pine - B2258-01
$499.99 | Hayneedle
Serena & Lily Scribble Border Rug
Serena & Lily
Joyo Light Colors Table Lamp
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™