Green’s Dictionary of Slang

stubble-jumper n.

(Can./US) a poor farmer.

[US]Calif. Folklore Quarterly Apr. 164: ‘Longhorns’ are greenhorns from Texas who came to the mines of Butte in great numbers, [...] ‘Top hands’, ‘sodbusters’, ‘hay stopers’, ‘stubble jumpers’, [...] denote farmers who have turned to mining, and these terms are always opprobrious .
[US]H.B. Allen ‘Pejorative Terms for Midwest Farmers’ in AS XXXIII:4 265: [...] stubble jumper.
[US]Sun (Vancouver) 4 July 1/1: The prairie farmer, to those of us who don’t know him well, is a stock comic character. Clod-hopper, we call him, and stubble-jumper [OED].
[Can]H. Gamer Author, Author! 60: Since the War, large numbers of them have been led astray by stubble-jumpers from Tignish or Musquodoboit, strumming mail order gee-tars and bewailing the loss of their boots and saddle.
[US]Maledicta II:1+2 (Summer/Winter) 171: Stubble-jumper The Canadian equivalent of Okies, the Stubble-jumpers fled poor dirt-farms during the Great Depression and migrated westward. Their descendents are still called Stubble-jumpers today, as are dirt-farmers in general.
[Can](con. 1920s) O.D. Brooks Legs 100: I’m a stubble jumper from a small town outside Saskatoon.