What are these yellow spots on my sunflower leaves?

harrieteregan

Since I took that photo the spots have gotten yellower/darker, and on a few plants they’re starting to turn brown and merge a little. I did a few Google searches and thought maybe it could be rust, but I’m not sure. What is it and how do I fix it? Thanks.

AnniD

It's possibly some type of fungal infection Harriet.  Has it got any worse since you originally posted ?
(Sorry your post slipped through). 

BobTheGardener

Or possibly marks caused by sap-sucking instects such as flea beetles or thrips.  Either way, all you can really do is try and improve growing condtions such as not under or over watering, keeping outside in an open position with full sun, planted in fertile soil.

Edit: odd looking sunflower seedling tbh.