How do I disable the post thumbnails on blog pages?
First, create a page (let’s call it “blog”) using the custom category page template. Tell it which categories to pull in using a custom field of categories and the value should be the category IDs. (See help files)
Set a custom field of hide_thumbnails with a value of ‘yes’ to hide thumbnails on that page.
Note: be sure when using the custom category page template as your blog you do not have anything set under – Settings > Reading > Posts Page.