I don't think you really know what has happened here, first you state that midges have been in the Scottish countryside for years then somehow try to blame them for a disease that was brought over from the continent last month.
Midges carry the infection, they didn't invent it nor was it their poor farming practices or effect on the climate that caused the first case of bluetongue on British soil ever.
A google search for "locusts killer gene" (without the quotes) returns nothing.
Seeing as you asked, the solution is to vaccinate the cattle, lets hope they can do it quickly.