"Committed" offenders would have been drenched as they slashed the tyres on three pivot irrigators, causing thousands of dollars worth of damage, police say.
Senior Constable Craig Bennett, of Kurow, believes the attack on the irrigators occurred early on Saturday near State Highway 8 and Broken Hut Rd, just outside Omarama.
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Snr Const Bennett said it was too early to say if the vandalism was caused by an individual or several people, but the irrigators were not easily spotted from the road and fences would have been navigated by someone with intent.
Forty-four tyres, valued at up to $800 each, were slashed, he said.