Should/Can you prune CLM damaged leaves from py

jaybird3316March 20, 2011

CLMs tore some of my younger trees up last year (I am ready this year to combat them if they come). However, I was wondering, does anyone know if pruning/removing the disfigured, ugly and some partially brown leaves is a problem?

I would love to remove them. The new flush is coming in nicely and I would like to forget my prior year battle with these pests.

I have the tools to fight it this year and I am on the lookout!

Thank you for reporting this comment. Undo
greenman28 NorCal 7b/8a

You bet, you can remove them.
Not a problem at all.


    Bookmark   March 21, 2011 at 12:10AM
Thank you for reporting this comment. Undo

In short: Can you? Yes. Should you? Probably not. But if it's just a few, go ahead.

A CLM damaged leaf will still function normally in the parts that weren't damaged and if the damage wasn't severe near the base of the middle vein (almost never is). There are stomata on both the underside and top of each leaf.

But IMHO, assuming the tree is otherwise healthy and *is in a current flush*, if an individual leaf has more than 50% damage on the top or is severely crinkled/warped/curled, I remove it. It just ends up shading below it to limit light to good leaves or limiting the spots for new growth flushes. However, I would be reasonable and never remove more than 1/5 of the leaves! That's asking for trouble.

Several websites claim CLM damage isn't detrimental to the tree and is cosmetic only. That is not entirely true or is missing the fine print *for mature trees*. For young trees even a moderate case can weaken it and the next stress that comes will take it out.

I am in the same boat with several of mine.

So just curious, what tools are you using for this year?

    Bookmark   March 21, 2011 at 12:13AM
Thank you for reporting this comment. Undo
hoosierquilt USDA 10A Sunset 23 Vista CA(10b Sunset 23)

I agree with cebury. Better not to trim away the damaged leaves. They will provide shade for fruit and the trunk, as well as provide photosythesis. And for treating CLM, most citrus nurseries in my area are using a combination of Volk Oil and Spinosad during your infestation time. For me, it is when it starts to warm up in the spring, and then again, in the fall. I am spraying every 3 weeks in the evening, for 3 to 4 applications. Then repeating that in the fall. So far, knock on wood, this has worked for me.

Patty S.

    Bookmark   March 21, 2011 at 12:28AM
Thank you for reporting this comment. Undo
greenman28 NorCal 7b/8a

Patty, that's not quite was Cebury said ;-)

He said the unhealthy leaf will end up limiting light available to healthy leaves below it.


    Bookmark   March 21, 2011 at 2:05AM
Thank you for reporting this comment. Undo
hoosierquilt USDA 10A Sunset 23 Vista CA(10b Sunset 23)

Didn't mean to misquote, but those lower affected leaves are probably not going to be shading new flush, as new flush is usually above older growth, or out at the tips of branches beyond last year's leaves. And the leaves really aren't "unhealthy", just "unsightly" :-) They DO provide shade for the fruit, so if you're in an area of the country that might have strong enough sunshine to sunburn young fruit, better to leave the affected leaves. I am in an area that is heavily affected by CLM, and every one of my trees suffered damage to the existing citrus trees before we purchased the place in the fall of '09. Last season, with phermone traps and spraying, I was able to significantly reduce the attacks, but still had some damage. Here's the advice I have been following, and there is no "fine print", but in bold print about managing young trees and mature trees. It is important NOT to overprune young trees, "...Avoid pruning live branches more than once a year, so that the cycles of flushing are uniform and short. " These instructions are very thorough, and take into account several different scenarios and growing practices. I prefer not to use Imidacloprid, as it is very toxic to honey bees, and have been using a combination Volk + Spinosad, as well as phermone traps instead, and apply the spray in the evening, and just to new flush. I also try to avoid spraying during bloom times if at all possible (obviously for my area, not possible with my lemons, and they bloom all year round.) I am going to be trialing SPLAT in the home orchard setting for ISCA Technologies. I have had their regular CLM phermone traps up, which has helped, but not entirely eliminated my CLM, so I'm hoping their newer product will alliviate my issue, so I can stop the spraying. I'd really rather not spray at all, to protect my bee population. Here's info on ISCA Technologies:

Their SPLAT product has been approved for both commercial and residential use in Florida, commercial use in California (and residential application recommendaitons are being finalized right now), and they are also working on several other FDA approvals in other citrus states as well. Great company, lots of brainpower there being applied to non-insecticidal management options from CLM, as well as other pests.

Patty S.

Here is a link that might be useful: UC IPM: CLM Management

    Bookmark   March 21, 2011 at 11:56AM
Thank you for reporting this comment. Undo
greenman28 NorCal 7b/8a

how big is your tree? How many leaves affected?
If your tree is small, keep the leaves for the time being.
If the tree is large, pluck those leaves as you please.


    Bookmark   March 21, 2011 at 1:32PM
Thank you for reporting this comment. Undo

Thanks to everyone for your responses. I have a very large HB pummelo and large marsh grapefruit that were not significatly affected, but I have a medium sized meyer lemon, 2 satsumas medium sized and a small Ambersweet orange that were hit hard in spots. I would say the damage is over 50% on some leaves. I figured it might make them susceptible to disease, etc. In addition to just being unsightly.

I would say a big mistake I made last year was trying to fiddle with the little suckers by crushing/pinching etc. to get rid of them. Seems like i just damaged the leaves more when I tried to do that. Plus it was just an exercise in futility.

As far as my "tools" go, nothing special. Just spinosad and neem oil. I haven't sprayed yet. I have been vigelently looking for any sign. Last year I was totally taken off guard by the quantity and veracity. Hadn't been a big issue before.

    Bookmark   March 21, 2011 at 9:57PM
Thank you for reporting this comment. Undo
hoosierquilt USDA 10A Sunset 23 Vista CA(10b Sunset 23)

Jay, depends on whether or not your state has a problem with citrus canker. Here in California, we really don't, so we don't worry so much about the CLM damage and removing it (except that it looks terrible). But, if you're in a state that has to deal with citrus canker, damage from CLM can make a tree more suseceptible to canker. I shared California's UC IPM's recommendations for CLM management, but you might want to check your state extension service's recommendations for CLM, and see if citrus canker is an issue for you.

Patty S.

    Bookmark   March 21, 2011 at 11:38PM
Thank you for reporting this comment. Undo

Thanks Patty S.

I will probably remove them just because they are unsightly and see how that works out this year.

    Bookmark   March 22, 2011 at 9:43PM
Sign Up to comment
More Discussions
Does this look infected to you?
Hi there, Pretty new to the forum and growing citrus...
Help on Adjusting Bearss Lime light conditions
Its been a while since my last post and well my Bearss...
Is this Oro Blanco grapefruit ripe?
Hello friends! This fell off my tree and I have n clue...
Thomasville Citrangequat Zone 6b SUCCESS
Just wanted to let everyone know that my Thomasville...
is this realy not a sweetlee tangerine or not
Can any one help me Identify what kind of citrus tree...
Steve, Z (6Bground,5B roof) Cincy,OH
Sponsored Products
Savoy House 9-2898-1-56 Brandywine New Tortoise Shell Wall Sconce
Littman Bros Lighting
Houndstooth Area Rug
Home Decorators Collection
Kathy Davis Cool Floral Tablecloth & Runner
$7.99 | zulily
Custom Concord Upholstered Bed
Home Decorators Collection
b+in Storage & Organizers 12.5 in. x 5.8 in. x 12.5 in. Fabric Half Storage Bin
$31.96 | Home Depot
Firenza Octagonal Solid Brass Cabinet Knob
Signature Hardware
Lite Source Luce Silver Metal LED Desk Lamp
$69.00 | Lamps Plus
Classic Lighting Corporation Lugano Bronze Nine-Light 32 Wide Chandelier
$457.88 | LuxeDecor
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™