Cotyledon damage and viability

My cucurbits are being annihilated by leaf miners. Just how much damage can the cotyledons take before you give up on the plants? Mine have everything from a lot to a little. They are all 3-4 weeks after emergence.
Paul
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com 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.