I don't see any rust mite damage, but the 'Meyer' leaves look like they have greasy spot disease (Mycosphaerella citri). Where are you? Did you get the tree recently? If you're not in the humid Southeast, and the tree did come from the Southeast recently, the disease will likely disappear and never show up again. On the other hand, if you live in greasy spot country, a single copper+oil spray in mid-summer will usually control it quite well.

The smaller leaves with the creamy yellow specks appear to have a scale insect, although not one that we see here in central Florida. Can you scrape them off easily with a fingernail? If so, you should probably spray with something for scales. Depending on the species, oil alone may do it, or you may need a true insecticide.

Malcolm

Malcolm M. Manners, Ph.D.
John and Ruth Tyndall Professor of Citrus Science
Florida Southern College
Lakeland

Malcolm

Thank you so much for your input. I live in Fort Worth, Texas. I noticed that black spots on the Meyer after we had a period of over a week with rainy and humid conditions. There is one other leaf on the Meyer that looks like the picture. The Meyer was purchased a few months ago here in Fort Worth. I am not sure if greasy spot is common here in Texas or not. The weather here now is very hot (100F) and dry - at least this week.

Those yellow specks on the small leaves (Lemon Drop tree) do not scrape off easily. I have tried to scrape them and they do not come off. I will investigate to find pictures of scale to compare to and do a treatment.

I really appreciate the help.
Kim

Here is the latest pest discovered on my Lemon Drop tree this morning. I have pulled of 3 of these things and squashed them. Does anyone know what these are? I am feeling somewhat overwhelmed by all these pests/disease issues! GRRRR

Kim

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Hi partyprincess,

How come you don't get some good fish emulsion and consistently spray your plants down with it in water?

It works..No bug except for flies here likes the emulsion, and it coats any harmful insect with oils while it shines your leaves..Why not enema oil while this stuff suffocates any pest while it also treats diseases?

If they were my trees, you bet your boots I would be spraying them tomorrow..

Mike

Hi Mike

I have some fish emulsion. I also went today and got BioNeem oil. This evening it is supposed to cool down to 77F. I read on one of your old posts that you have used a tiny bit of neem with FE and maybe some other ingredients to spray your trees. Is that right? If so could you repeat the recipe here? I would like to spray everything this evening after it cools off some. I am anxious to try some treatments. Thanks!
Kim

One more thing.. The FE alone may not treat any disease, but that is where the Neem oil comes in..:_)

OK, everyone has had a nice FE bath, including me! I am hoping I don't find any new unidentified critters tomorrow. Do I need to rinse them off in the morning before the sun gets hot?

Kim

Mike

I have to say I am feeling much better. I have been so frustrated lately after working so hard to get my citrus in the right mix, get my Foliage Pro, not over-water, etc. only to discover now that I have a multitude of pests and possibly some disease in my trees. While I was doing my FE treatment tonight I was really having a pity-party for myself. I came inside and looked over some old posts regarding the use of Neem oil (I am really worried about using it right now because it is 100F during the day here). I ran across some old posts of yours from late 2008 and you seemed to be battling the multiple unknown pest issue then. Since I have seen pics of your trees now I feel much more hopeful. Obviously I am not the first to struggle through the learning curve to figure out what works best in my situation. Thanks to the forum and so many helpful folks I am feeling slightly hopeful.
Kim

No don't rinse them off..They will be just fine...

Glad your feeling much better, now let us see if your plants are....:-)

Hope everything turns our for you all..

Mike

Every once in a while Ill see a grass hopper hanging around the trees and just regular flies. I havent notice any caterpillars that I would suspect would do that kind of damages. So far they only eat the lemons leaves.
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Mike do you think the FE treatment would work on grasshoppers?

http://www.texascitrusgreening.org/signs.php

http://www.ipm.ucdavis.edu/PMG/C107/m107bpleaftwigdis.html?printpage

HS14100floridacitrusleafporblems.pdf
HS 890 University of Florida HS12200 IAS

You may find these sites useful.

Yehuda

Mksmth,

Do you think it is grasshoppers doing that? I never heard of them likeing any kind of citrus at all...

I know it works for the common destructive sucking pest most of us deal with, at least the ones that I ahve dealt with..I would be curious to know if it works for others..

Good luck..You know I had a few leaves do this to me too this summer, and so did Josh..I ahve never seen one bug while chewing though...lol

Mike...

Yehuda

Thank you so much for adding the links. The information is great.

Kim

Im not sure Mike, I have never actually seen what is doing the damage. All I have seen is the grasshopper. Im going to try the FE anyways just to see. Ill let you know what I find out.

Mike and mksmith,
I have fuller rose beatles in my yard and they attacked my in ground 20or more year old lemon the last two years. They eat at night and hang in shade during the day. They can eat alot. Look them up on the net. Very hard to kill. I am now finding them on my lisbon inground in my front yard wich is close to my potted trees. I am gonna try the FE and see if it works on them. Forgot how often you do it Mike.
I am also posting pics of the leaves from an inground orange that is also 20+ plus years old (I live in my grandparents home). Hope someone knows what is causing them to do this.
thanks,
Dave
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Uploaded with ImageShack.us

Mksmith

I'd bet money and lots of it on the grasshopper's. I bought a beautiful tree in June 2011 (unfortunately I don't have pic's of it before the attack), but here are pics just about a month later: Lemon Aid

I just posted pics of this tree seven months later...it is making a slow recovery.

This grapefruit tree is the only one of a half dozen various citrus trees that show any sign of this problem. Any ideas what the problem is?

This post was edited by mwr1026 on Thu, Apr 11, 13 at 14:03

Hello All!

I've been beatin' my head over this problem since this spring. See attached photo. This is my clementine mandarin. This year it has seemed to be a bit stubborn. At first I thought I over fertilized (although Same as last year) but then I removed nearly all the fertilizer extended release beads (Scott's citrus) and after a few weeks, it still didn't want to get out this slump of discolored leaves and start producing a nice dark green glossy leave production.

It bloomed and is currently rippening fruit.

It has new growth.

Ive been attempting weekly/biweekly watering depending on temps.

It's in a container (larger clay) as it has through out it's upbringing.

Difference this year, has been off drip system thought of overwatering.

Concerns:
Leaves have brown areas that eventually necrosis away the leaf and creates holes within them.

The leaves are of a yellow green rather the dark glossy green.

I have purchased moisture and ph meteres just for kicks. Ph has been about 6.

Also since removing most of all fertilizer, I returned only a portion to see if improvement. Maybe some improvement?

Any help on the identification on the problem. Some type of disease or pest? I haven't seen anything but spiders here and there.

Thank you!

Jason

Another photo.

One last additional photo.

I doubt this has anything to do with over/under fertilizing. Where do you live? Helps to know the part of the country you're in, and humidity levels. The large, dark brown "burnt" patches look like a mechanical or chemical burn to me. Possibly from something sprayed on the tree. Could be previous, even, to you owning the tree. Can be caused by hort oil sprays during hot weather, burning the leaves, or fungicides sprayed (copper) again, burning the leaves. Even frost can do this sort of damage. However, the smaller spots look more fungal in nature to me. If you're on the east coast, Greasy Spot can be an issue, and this might possibly be what's going on. But, I can see the spotty leaves up close enough to tell. If you're in California or AZ, that would not be an issue (we just don't have enough humidity for this to be an issue.)

Patty S.

Patty has this covered Jason.

I wish you the best of luck in helping your tree......

Mike:-)

Thanks Mike,

Hello Patty!

Thank you for input.

I forgot to mention that bit of key information. I'm located in Northern California, near Sacramento (near Davis).

I have had this citrus 4 years and haven't had any type of spray upon them. In the prior years, all has been well until this year.

Also forgot to mention, last fall, I did complete it's first pruning session. Nothing dramatic. It did stay part winter outdoors, then when it was consistently dropping low 40s, i brought it indoors until it maintained mid + 40s.

I was wondering if it were Greasy Spot, but figured as you said, west California.

Those brown areas develop from a sparse brown dots until it becomes more uniform into a solid shapes. After that point, it usually starts to necrosis inside out to a flakey ash like dead leaf. But only creating holes, not killing the whole leaf.

Are there any other photos I can take to assist in the matter?

Thank you again for the time to reply. I greatly appreciate any help.

Jason

Hi,

I have some leaf discoloration that I'd like help diagnosing. My tree is a sanbokan lemon or sweet lemon that is about 3-4 years old. It has tons of new growth but hasn't flowered in the last three years. I live in Montreal, Canada, so the tree is potted. It lives on a very sunny deck all summer and comes in to a not-as-shady window in the winter. many of the leaves have yellow discolorations on them. I fertilize irregularly with espoma citrus tone. I know the most likely diagnosis is nutritional deficiency, but I read about HLB and I just want to be sure that isn't what I have.

Any help would be greatly appreciated!
Sig

more pictures!

more pictures. my tree is also relatively leggy - not sure if that helps.

This is from what I think is a key lime that I have had as a container plant for about 6 years. This year all of the new growth on the plant shrivels up, turns black and dies. In addition, some of the older, full size leaves have developed light green spots on them. Fruit production is way down from what it had last year. Can anyone help?

Bumping it down....
G&t... better to start a new thread than to try to append to a 3 year old thread.

The blackening/die-off in your photo is most commonly caused by insufficient water combined with putting very tender new growth in hot sun.

Hi guys, this is my first post so bare with me if I do anything that isn't perfect on the forum. I live in the panhandle of Florida and have a Tangerine tree. We planted it February of 2011; we harvested about 15 or so tangerines from it that following fall. Well this year in the late winter months/early spring months I noticed that we only got a few of the citrus blossoms, where the fruit then flowers from. And any "baby fruits" that budded there quickly browned and fell off. At this point, we will not have any fruits come this fall. I have a few photos to show what's happening with the tree. Please help! I have no idea what the source is and what action I need to take. This is my first citrus growing venture.

This first photo is of the tree itself. You can see a few yellowing leaves towards the base of the tree, on the left and right side.

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This photo is of new growth that I popped off. It has these "tapeworm" type curvy lines on the surface that can be seen on the front and back. There is also a sheen near/around/surrounding these lines, similar to the look of what a slug would leave behind.

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This photo is of semi-new growth, within the past few months or so. The leaves are curling and cupped and damaged looking around the edges.

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This photo is of an older leaf, probably original to the tree when we purchased it. It has the same "tapeworm" like trail on it with the clear film on it as well.

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I have no idea where to begin with figuring out the problem. I have not seen any visible pests that would cause the damage. Any thoughts? They are greatly appreciated! Thank you!

I am new too, but my lime tree has the same thing. My google searches indicate it is leaf miner and my forum reading says it is probably best to simply let it go, it evidently doesn't effect the leaf utility, it just makes them ugly.

mahchelbs and jostheim, you're both dealing with Citrus Leafminer. Much, much discussion on our forum about CLM, just search for the topic and you'll see plenty of responses. We talk about this annoying but rather benign pest ad nauseum this time of year. Also, just a tip for forum newbies - you're much better off starting your own message thread about a topic, than tacking onto someone else's 3 year old topic :-)

Patty S.

Can someone please help me with the cause and remedy for the problem on these key lime leaves? Thank you.

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Jason_aka_Jason,

I know that it does not look the same in the pictures that you can find on the web but it looks to me like you've got a little citrus scab going on there... I've had the same thing present on my tangelo tree and a couple rounds of Kocide took care of it. Scab is common on lemons, mandarins, and tangelos and is not a big issue if you catch and treat it early. I use Kocide 3000 at the following rate with very good results:

(Disease present) KOCIDE 3000: 2 TBspn per 1 Gallon H2O every 5-7 days. + ý teaspoon wetting agent.

(Maintenance/Prevention): 1 TBspn per 1 Gallon H2O every 2-3 weeks + ý teaspoon wetting agent.

sig_r,

Looks to me like a Magnesium deficiency. Consider applying Epsom salts or Magnesium Nitrate as a foliar spar at the following rate:

1% MgSO4 (Epsom Salt): 1.2oz per 1 Gallon H2O + ý teaspoon wetting agent

2% Mg(NO3)2: (Magnesium Nitrate; 10.5-0-0+9.4%Mg ): 2.5oz per 1 Gallon H2O + ý teaspoon wetting agent.

That's what I would do for my trees anyway...;)

Best,

Skinn30a

My Meyer lemon has been moved inside for the winter. I just notice that many leaves have small holes, and several have large parts eaten from edges, like caterpillars do, and those often have fine webs across them. Can anyone ID the insect and/or suggest a treatment?

Also, I'm not able to upload more than one picture--uploader won't let me select two, and if I upload a second one by itself, the first is deleted.

Thanks.

Here's the other photo.

Well, not sure what's eating the leaves, but for sure you've got a hefty spider mite infestation. We have lots of info on managing spider mites on the forum. And, to load multiple photos, just upload all your photos to photobucket.com. Then, copy and paste the HTML code string for each photo right in the body of your message. That will embed the photo right into your message. You can paste in as many photos as you wish with this method. Also, better to start your own message thread, than to tack onto a much older one.

Patty S.

This post was edited by hoosierquilt on Mon, Dec 16, 13 at 17:32

Can someone help me with my Meyer lemon tree?

Its sweet orange leaf (citrus leaf), Kindly help in identifying the cause of damage?

Please identify the disease on citrus leaf (sweet orange)?

Christy, I suggest you start a new thread with your question. It is so old that many will not respond. I wish I could help you, but I have no clue!

Without a microscope it is hard to tell but it might be a sporangium possibly of some type of fungus.

Could be a fungus like Vladimir said, could also be an insect egg or just dirt on a bit of fluff.

However, I'm more concerned with how dusty the leaves are. I may just be dust or it could be the beginnings of a spider mite infestation.

It's a good idea to wash off the leaves from time to time, like maybe every 4-6 weeks. Take them outside and hose them off, or if that's not possible, put them in the shower and shower them off with cool water.

Then let them drain well and put them back where they were. It helps prevent spider mites as they're attracted to dusty plants. And your plants love the rinsing off!

Not really raised or anything, little chalky I guess and smooth at the same time. Comes off with my finger

Can you tell me where I might send a photo to have a citrus identified? I have one that was supposed to be a meyers lemon. Then I’m told, oh, that’s a lime, now it is loaded with fruit the size of a quater — 50 cent piece turning yellow and falling off the tree. I’m hoping that maybe it turns into a key lime now. 😁

Thanks, Guys 🇺🇸🇺🇸🇺🇸

Chico Neyrey

Charleston, SC

Try this: http://idtools.org/id/citrus/citrusid/index.php

 One the leaves it could  nutrition problem but what does I know I'm no expert

 Looking like some Inscet damage 

Hosard