More than 7000 worms were allegedly stolen from a Wawunna Road, Horsham, sometimes between 10am and 4.30pm. 

Senior Constable Melissa Seach said police believed the worms - valued at a dollar each - were removed from boxes. 

"Investigators are keen to speak to any witnesses or anyone who might have seen any suspicious activity in the area," she said.

Anyone with any information can call Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.