functions.php

<?php

/**
 * Remove Post Info and Meta from Teasers
 *
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/remove-post-info-meta-teasers/
 */
function be_remove_info_from_teasers() {

	// First, we make sure we're in the grid loop.
	if( ! apply_filters( 'is_genesis_grid_loop', false ) )
		return;

	// Remove if a teaser
	if( in_array( 'teaser', get_post_class() ) ) {
		remove_action( 'genesis_entry_header', 'genesis_post_info', 12 );
		remove_action( 'genesis_entry_footer', 'genesis_post_meta' );
	}

}
add_action( 'genesis_before_entry', 'be_remove_info_from_teasers' );