The rationale for Wildlife Conservation

[Monster92]

So this is a topic I am studying. Under the economic benefits section, there's a line that states "wild varieties for breeding programmes"

 

I then need to do further research around this statement. However, I don't understand it. What is this trying to say?

[Mr Skeptic]

Consider modern breeding techniques. We can do rather fancy things, but it helps to have lots of genetic variety to work with. The wild varieties, which have to survive on their own and without relying on humans, have a lot more variability than the species we have selectively bred to the point they have little variability. Hence interest in wild grain species for their pest resistance, or such.