It's a crime so odd that any motive seems almost inconceivable.
Some Australians have posted photos on social media showing needles they found in their berries.
Reports out of three Aussie states have strawberry lovers checking their fresh fruit carefully.
Queensland Health said in a Thursday tweet that "consumers should cut up strawberries before consuming them", even if they're not from one of the six named makers. "I am furious about this".
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"Whereas we would normally be selling 30 tonnes a day of locally grown strawberries to WA markets, it has dropped to 20 tonnes".
Australia's industry development officer Jennifer Rowling said: "It's quite devastating for our growers - they're really upset about it, obviously, because this is their livelihood and someone has taken it upon themselves to do something really nasty".
"With strawberries you need to continue picking them", he told ABC.
The Berry Obsession, Berry Licious, Donnybrook Berries, Love Berry, Delightful Strawberries and Oasis brands of strawberries are believed to be affected, according to the police, who said the contaminated fruit appeared to have originated at a Queensland-based supplier. "If you stop picking them for a few days then they stop producing fruit, so we're trying to weather out this storm and hope that things get better, but to do that it's costing". A number of grocers have removed the berries from their shelves.
The Queensland premier, Annastacia Palaszczuk, has issued the reward over concerns for growers as well as consumers.
"How could any right-minded person want to put a baby or a child or anybody's health at risk by doing such a terrible act?" she asked.