Hi everyone, would really appreciate help to see if my Thyme plants have fungus or other serious problem and if possible recommendation of a treatment method.

The leaves of my Thyme plants have started to develop white blotches and seems like plants growing together are starting to get the same problem. Whereas 3 other Thyme plants in a separate pot does not seem to have such a problem yet.

I am growing them on my balcony in a hot tropical climate in Vietnam. The plants gets about 5 hrs of afternoon sun from 12pm till 5pm.

Thanks in advanced for any advice.

Wayne