evtubbergh
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Posts: 532
Joined: Sun Jan 13, 2013 6:52 am
Location: South Africa

Help with citrus disease

My mom sent me this picture of her kumquat:

Image

I have identified citrus canker and citrus scab as the most likely culprits but she says the obvious symptoms are not all there. There are no conical raised sections on leaves (scab) and no yellow water rings around lesions (canker). I am not sure what else it could be or how else to differentiate.

Does anyone recognise it?

https://idtools.org/id/citrus/diseases/f ... rus+canker
https://idtools.org/id/citrus/diseases/f ... rus%20scab

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applestar
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Posts: 30514
Joined: Thu May 01, 2008 7:21 pm
Location: Zone 6, NJ (3/M)4/E ~ 10/M(11/B)

Aren't those scale insects?

Ah, here we go:

:arrow: https://cisr.ucr.edu/california_red_scale.html
California Red Scale, Aonidiella aurantii

imafan26
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Posts: 13961
Joined: Tue Jan 01, 2013 8:32 am
Location: Hawaii, zone 12a 587 ft elev.

yep, scale. There are probably ants nearby too.

I control the ants and use horticultural oil on the plant and a toothbrush. Scale can be scraped off if the infestation is light. Imodicloprid works well for a year, but I don't use systemics if I don't have to and I don't want to use it on anything I eat.

evtubbergh
Green Thumb
Posts: 532
Joined: Sun Jan 13, 2013 6:52 am
Location: South Africa

Really? I could not see that from the photo. Oops. Oh well. Oh wow look at that photo, it's exactly the same! Thanks :)

mattie g
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Joined: Wed Jul 07, 2010 7:58 am
Location: Northern VA, USA -- Zone 7a

I can't see the picture, but it sounds like others have identified it as scale. I get it pretty badly on my indoored meyer lemon in the winter. I take a wet paper towel and wipe off as many as I can, then spray with neem oil. That usually does the trick.

Now getting the lemons to grow to maturity is another matter altogether...



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