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15 messages
28/12/2013 at 11:54
Hi all.   Hope someone can help please.   I have had white spots on most of my herbs this year ( see photo ) Do you have any idea what is causing it and how do i treat it. The herbs are in well drained pots with the correct sand/compost mix. I have heard that it might be thrips but there has been no signs of them and i have checked regularly this year. It is actually in the leaves so i do not think it is a fungus. Can you help please.   Kind regards   Ed.

28/12/2013 at 12:01

Can't see the pics Ed   click on the little tree icon in the toolbar above where you type your post and follow the instructions - hopefully that will do the trick 

28/12/2013 at 12:24

Thanks Dovefromabove I will get the hang of things.


28/12/2013 at 14:02

Hi Edd, are these indoors or outdoors?

28/12/2013 at 14:23

Hi Bob.


They are out side in pots. They are watered at soil level so i do not think it is sun scorch. It has spread to my mint and oregano, so not sure what is causing it.

28/12/2013 at 14:43

I'm thinking that it could be rust ? 

28/12/2013 at 15:01

I am familiar with rust and this is not as aggressive as that  and does not have the blisters on the outside of the leaves. It is actually inside of the leaves.

28/12/2013 at 15:12

Something tiny eating away inside the leaf? 

28/12/2013 at 15:21

That's what I'm thinking too - some kind of leaf miner? There are a couple of UK species which can affect thyme and there is rosemary leaf miner.

28/12/2013 at 15:22

I am not sure. It would have to be minute if it is. It does not kill the leaves off or damage them in any other way apart from the appearance.

28/12/2013 at 15:26

leaf miners are small. I've never found one yet, just the evidence of their activity.

They're probably visible to a good naked eye but I can't focus down that far

28/12/2013 at 15:26

Some info on miners affecting thyme here, Edd, although it probably won't help much in this format:


28/12/2013 at 16:23

The more i try and read, the more it looks like THRIPS. 

28/12/2013 at 16:31

Could well be.  You could try bringing one indoors, putting it on a large piece of white paper and brushing over the foliage a few times with your hand.  Any thrips should fall onto the paper.  Whatever the pest is, I'm not sure what you can do unless these are plants kept only for decoration as you wouldn't want to spray chemical controls onto anything you will use in cooking.

28/12/2013 at 18:26

Thanks for your time Bob and Dove/Nut. That idea sounds good. 


unfortunately i used all my herbs over xmas and trimmed the plants right back for the new growth in the spring. If it is thrips then i will have to use Nematodes and sticky traps to try and identify and catch them, as the eggs will be in the soil now.

Any idea where to get "hot pink" sticky traps or make them?

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