Remove featured image on blog page posts that are in a specific category.

page_blog.php

<?php

add_action( 'genesis_before_post' , 'wps_no_featured_image' );
add_action( 'genesis_after_post_content' , 'wps_no_featured_image' );
/*
 * Remove featured image from certain posts.
 * 
 * Stops featured image from displayed on the Small Group Show category (126) on 
 * the blog page.
 * 
 * @author Travis Smith
 * @link   http://wpsmith.net/2012/genesis/how-to-hide-the-featured-image-of-a-specific-category-on-the-blog-page-in-genesis/
 *
 * @global stdClass $post Post object.
 * 
 * @return null Returns early if post is not in our chosen category.
 */
function wps_no_featured_image() {

    global $post;

    if ( ! has_category( 126, $post ) )
	return;

    if ( 'genesis_before_post' == current_filter() )
        remove_action( 'genesis_post_content', 'genesis_do_post_image' );
    elseif ( 'genesis_after_post_content' == current_filter() )
        add_action( 'genesis_before_post_content', 'genesis_do_post_image' );

}