This is an unusual Gene Autry film because it really is NOT a western. It is set out in the western United States but aside from that and the presence of a few horses, it's not at all what you'd expect from Autry. This is not really a complaint--just an observation about the type of film it is.
When the film begins, Gene has just left the rangers. No, not the type they have from Texas--FOREST rangers. In recognition of his work, they gave him a rifle and Gene uses it to kill a mountain lion that isn't doing anyone any harm. However, at the same time, a baddie shoots another ranger--and Gene assumes his errant shot killed the guy! Well, this plot actually was resolved reasonably quickly and folks realized Gene wasn't a killer--though they didn't catch the baddie responsible until late in the film.
The same jerk-face that killed the ranger is also trying to take advantage of an outbreak of moths that will destroy the timber industry. So, when Gene comes up with a plan to use crop dusters and the miracle pesticide DDT, this evil jerk starts poisoning animals and blaming Gene! What's next? See the film.
This is a reasonably entertaining B-movie. It's also of particular interest to music historians, as in addition to Gene's contributions to early country music, there also is some very early gospel music in this one. Overall, worth seeing if you are a fan.