Blister beetles help

Hi,

I was wondering if any of you have any thoughts on this.

A hay client who buys small square bales of alfalfa HEARD that a town in southwest missouri possibly had them in their alfalfa field. She won't buy from us because we are  town away. I can understand her caution.

I understand they are deadly to horses. I inspect our fields and have not seen any.

My question is on round up alfalfa is there something i can spray thats safe to kill or repel them. When I spray roundup. or by itself thats not to close to cutting time so I don't leave tractor and sprayer marks in alfalfa.

sorry for this being so long.

Blister beetles help