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Alternaria Brown Spot

 
Citrus Growers Forum Index du Forum -> Citrus diseases and pests
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budwood



Joined: 08 Jun 2006
Posts: 3
Location: Coastal South Carolina (Zone8)

Posted: Mon 16 Oct, 2006 10:25 pm

Hi Group,

I'm new to the group so first off, I live and grow about 10-12 types of cold hardy citrus in coastal South Carolina. I started growing about 3 years ago with one satsuma and..............we, we all know how it snowballs from there. I guess I need to move further away from Stan McKenzie! Wink

My problem is I have a tree with what I suspect is alternaria brown spot. At least it looks like the images I found on the internet. The tree in question is a Yuzu on FD rootstock. I have had the tree for 2 years and haven't had a problem with it until a month or two ago. It starts with small yellow spots which quickly grow and then turn brown in the center. Soon the entire leaf turns brown and falls off. I have sprayed with Daconil fungicide, but this doesn't seem to be helping. I have checked the spots with a hand magnifier and noticed small spherical fungal spores (I think thats what they are). Anyone have any ideas. Should I get rid of the tree or is there a cure or treatment.

BTW, I'm going to try and post a picture, hope it works.

Thanks
Bud

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Laaz
Site Owner
Site Owner


Joined: 12 Nov 2005
Posts: 5670
Location: Dorchester County, South Carolina

Posted: Mon 16 Oct, 2006 10:58 pm

I'm beginning to believe Yuzu is a pain in the @ss. My Yuzu on flying dragon developed scab mid summer. I used heavy doses of copper fungicide which cleared them right up, but still left some scars on the fruit.

Most every photo I see of Yuzu has some type of peel blemish...

Mine are about ripe now, I'll post a photo tomorrow.

Welcome to the forum Bud !
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Laaz
Site Owner
Site Owner


Joined: 12 Nov 2005
Posts: 5670
Location: Dorchester County, South Carolina

Posted: Tue 17 Oct, 2006 8:28 pm

Sorry it's raining hard, this is the best shot I could get today.



The Satsumas are as big as grapefruit this year, can't wait till their ripe !

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Skeeter
Moderator
Moderator


Joined: 23 Jul 2006
Posts: 2218
Location: Pensacola, FL zone 9

Posted: Tue 17 Oct, 2006 9:41 pm

Hi Budwood,
Here is a link on alternaria and management of it:

http://edis.ifas.ufl.edu/OUTLINE_CH017

-- Skeet
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budwood



Joined: 08 Jun 2006
Posts: 3
Location: Coastal South Carolina (Zone8)

Posted: Tue 17 Oct, 2006 10:34 pm

Thanks for the link Skeet. That is the site I found earlier that made me think I had ABS on my YUZU. Laaz said he used a copper based fungicide on his plants and it helped. What product did you use or do you recommend? I've got a friend with some Kocide 101 and the label indicates it can be used on citrus......or is it to late to even worry about it?

Thanks for the pic Laaz

Bud
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Laaz
Site Owner
Site Owner


Joined: 12 Nov 2005
Posts: 5670
Location: Dorchester County, South Carolina

Posted: Tue 17 Oct, 2006 10:55 pm

Bud it is Bonide Liquid Copper Fungicide. What town are you in ?
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budwood



Joined: 08 Jun 2006
Posts: 3
Location: Coastal South Carolina (Zone8)

Posted: Wed 18 Oct, 2006 2:05 pm

Laaz, I live just outside Conway, the new citrus hot spot. Bud
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Skeeter
Moderator
Moderator


Joined: 23 Jul 2006
Posts: 2218
Location: Pensacola, FL zone 9

Posted: Wed 18 Oct, 2006 7:56 pm

The only time I have needed a fungicide I used a liquid copper (hydroxide).

Skeet
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