mature or past maturity, a large amount of the stomach contents consisted of green vegetation from above the ground. It is not known how much of this vegetation might have been pulled underground to be eaten, but experiments with aluminum-coated grain showed that much of this type of food was gathered on the surface. This information has led to field trials in surface baiting as a means of pocket gopher control. Although the results still are inconclusive, there is the possibility that under some conditions at least, surface baiting might replace the more laborious method of probing for underground burrows as a means of bait placement.
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Thane Riney (1960) studied this question.