Tropical Fruit Forum - International Tropical Fruit Growers

Citrus => Citrus General Discussion => Topic started by: Mtlgirl on September 02, 2017, 09:45:14 AM

Title: Help with my meyer lemon
Post by: Mtlgirl on September 02, 2017, 09:45:14 AM
Hi everyone,
some leaves on my meyer lemon have develop some yellow patches on the. What do you think could be the reason?
Here are some background:
- I live in montreal canada where we had a very wet and cold summer this year.
- I only water my tree when the top is drying and give some fertilizer once a week (dynagro foliage 9-3-6).
- It had been outdoor all summer and Have been indoor this week because the temperature is going down to 40F.
Where are some pictures
(https://s26.postimg.cc/dac1z08yd/IMG_0465.jpg) (https://postimg.cc/image/dac1z08yd/)

(https://s26.postimg.cc/3r2d5jlg5/IMG_0466.jpg) (https://postimg.cc/image/3r2d5jlg5/)
I have inspected the tree and didn t see any bugs. By precaution, I spray my tree with a insecticide soap.
Thank you for your hep
Title: Re: Help with my meyer lemon
Post by: Susanne42 on September 02, 2017, 12:53:43 PM
looks like a fungus? With all the rain I think very possible
Title: Re: Help with my meyer lemon
Post by: matt_citrus on September 02, 2017, 09:15:31 PM
People have seemed to think this is a form of greasy spot fungus.
Title: Re: Help with my meyer lemon
Post by: Millet on September 02, 2017, 09:45:01 PM
It certainly does not look like greasy spot
Title: Re: Help with my meyer lemon
Post by: matt_citrus on September 02, 2017, 10:06:30 PM
I didn't say I agreed ;). But would love a better diagnosis!
Title: Re: Help with my meyer lemon
Post by: Millet on September 03, 2017, 12:16:47 PM
The symptoms of Mtlgirl's tree look simular to Matt-citrus' tree.
Title: Re: Help with my meyer lemon
Post by: Mtlgirl on September 03, 2017, 01:25:57 PM
Hi,
I already tried to spray my tree with a fungicide a few weeks ago. Should I spray it another time?
Thank you for all your help
Title: Re: Help with my meyer lemon
Post by: Millet on October 29, 2017, 05:44:33 PM
Mat, MtGirl said she sprayed her tree with EndAll  which is a Pyrethtrum/soap compound, and it stopped her tree's problem.  See her post, her leaves look almost exactly like yours.
Title: Re: Help with my meyer lemon
Post by: matt_citrus on October 30, 2017, 02:23:57 AM
Millet, thanks. I did catch that in the other thread. Looks like it has Neem extract too. Heavy duty combo with the pyreth. and soaps - probably takes out the beneficials too. I wonder what it's defeating for the improvement?
Title: Re: Help with my meyer lemon
Post by: Mtlgirl on October 30, 2017, 08:47:30 PM
Hi Matt, what are the symptoms on your tree? Do you have old leaves falling?
Title: Re: Help with my meyer lemon
Post by: Mark in Texas on October 31, 2017, 08:21:56 AM
I have inspected the tree and didn t see any bugs. By precaution, I spray my tree with a insecticide soap.
Thank you for your hep


Just some wild guesses here.  I'm afraid of those soaps which are fatty acids of a salt.  I've burned foliage with them and that may be what's going on with yours.  Could be a fungus too, hard to tell.   My go to broad spectrum systemic fungicide is copper sulfate pentahydrate.  MagnaBon CS2005 or the more expensive one Phyton35.

I drenched my citrus with Bonide All Seasons Horticultural Soap yesterday and you would know it - temps in the greenhouse got up to 95F!  Hope there's no damage.  Here's a recent thread on it.  http://tropicalfruitforum.com/index.php?topic=25819.0 (http://tropicalfruitforum.com/index.php?topic=25819.0)
Title: Re: Help with my meyer lemon
Post by: matt_citrus on November 01, 2017, 01:09:50 AM
Hi Matt, what are the symptoms on your tree? Do you have old leaves falling?

Mtlgirl, see images here with similar symptoms:
 http://tropicalfruitforum.com/index.php?topic=25226.0 (http://tropicalfruitforum.com/index.php?topic=25226.0)
Title: Re: Help with my meyer lemon
Post by: Mtlgirl on November 02, 2017, 07:43:44 PM
Hi Matt, did you see any improvement with liquid cop or horticulture oil?
Thanks
Title: Re: Help with my meyer lemon
Post by: snek on January 09, 2018, 05:06:32 PM
I still think it's some kind of fungus.
Here's the photo in high resolution

(https://s17.postimg.cc/pwqvbubm3/IMG_1702.jpg) (https://postimg.cc/image/pwqvbubm3/)

(https://s17.postimg.cc/vxok92qkb/IMG_1703.jpg) (https://postimg.cc/image/vxok92qkb/)

(https://s17.postimg.cc/ougotgsuj/IMG_1704.jpg) (https://postimg.cc/image/ougotgsuj/)

(https://s17.postimg.cc/4abuuzsiz/IMG_1709.jpg) (https://postimg.cc/image/4abuuzsiz/)

(https://s17.postimg.cc/yrrpmgnkr/IMG_1717.jpg) (https://postimg.cc/image/yrrpmgnkr/)
Title: Re: Help with my meyer lemon
Post by: matt_citrus on January 10, 2018, 01:19:19 AM
Snek, the symptoms you describe here and in the other thread (http://tropicalfruitforum.com/index.php?topic=25762.msg301174#msg301174) match my experience so far. Only affecting the Meyer lemon (and mine is in the ground on standard rootstock) and not spreading to any adjacent trees.

I did recently find a contact in the CDFA Plant Pathology office that offered to diagnose, so I'll probably send a cutting in soon and perhaps we can all resolve!
Title: Re: Help with my meyer lemon
Post by: snek on January 10, 2018, 03:23:13 AM
Yes - affecting only the Meyer lemon. The rootstock or size of the plant has no effect on it. I have more plants, more combinations.

Good news!! Thanks. I will look forward to the outcome and the information.
Title: Re: Help with my meyer lemon
Post by: domer on January 21, 2018, 02:57:21 PM
New to the forum and learning a bunch from reading past posts.

I am having a (related) issue on my Meyer lemon tree that has been like this for a few months now.  Any advice on how best to address this would be greatly appreciated.  Many thanks in advance.


(https://s18.postimg.cc/qlkph6jw5/IMG_1965.jpg) (https://postimg.cc/image/qlkph6jw5/)

(https://s18.postimg.cc/pjaiyngid/IMG_1966.jpg) (https://postimg.cc/image/pjaiyngid/)
Title: Re: Help with my meyer lemon
Post by: lebmung on September 27, 2018, 02:03:06 AM
This can be caused by a bacteria. Fungicides could be useless.
Has anyone tried 0.5% copper oxychloride as preventive?
Title: Re: Help with my meyer lemon
Post by: TooFarNorth on September 27, 2018, 02:42:58 PM
Domer, that looks more like insect damage. Leafminers and possibly grasshoppers or other leaf chewers. On young trees, I recommend imidacloprid soil drench to help with the leafminers and horticultural oil for other insects. Do not use HO at high temperatures.

TFN 
Title: Re: Help with my meyer lemon
Post by: Millet on September 27, 2018, 09:09:58 PM
TFN  I was thinking the same thing.  It does look like insect damage.