I must thank all of You for Your input , and

Rhizo - This has got to be it !

Pictures of leaves that look exactly like my leaves.

Coincidentaly , today I went with my hand through our oregano seedling tray, and suddenly, many hidden little insects were flying low around the plants.It is said that adult male leafhoppers are active fliers when disturbed.

Other than that , I have taken a close look at one of them ,

and pictures I have seen on the internet match the look of the little insectI saw today. These small creatures feed from a variety of plants , by sucking sap from underneath the leaves, leaving little white-yellowish marks. If they feed from the same leaf many times, these small marks group together - which almost makes the whole leaf look white.

I even found about the sage leafhopper, Eupteryx melissae, which is a common pest of aromatic herbs in the Lamiaceae family,so it can be found on lavender,mints , oregano, basil , thyme , lemon balm and Phlomis species. Just about everything I've got on my balcony that's been affected !

It is said they are active from May throughout the summer and autumn , but can remain active if sheltered , and I think I noticed some of these around my herbs - that I brought in last winter ! There are many kinds , but leafhoppers on my balcony look like tiny-tiny little white-transparent flies.

As far as control goes , it is said that spraying may not be needed as the herbs will tolerate the damage,

but I don't know what to do.

Now I could use some suggestions !

Please note that I am from Serbia , a south-eastern European country , and American products are not at my disposal.

A home-made organic spray would be great !

Thank you for Your help everybody!

Image link: {{!gwi}}