suckers on grape vines

I've noticed lately that my fairly young grape vine is producing suckers at the crotches of leaves/branches. Are they worth leaving
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.