Many thanks to Chris Keating, who has not only uncovered the long-lost Australian tribute to the BBC's Swiss Spaghetti Harvest hoax, but has posted it on youtube. The date when this was broadcast is still uncertain. Seems to have been in the early to mid-1960s. It aired on Melbourne station HSV-7. The presenter is Dan Webb.
Whereas the BBC's original broadcast described the bumper spaghetti crop that the Swiss were enjoying, the Australian version develops the story further by telling the story of a group of Sicilian farmers who were brought to Australia in the hope of developing the Australian spaghetti industry. Everything went well until their crop was blighted by the dreaded "spag worm":
This year, for the first time, the spaghetti crop has failed. Hundreds of tons of spaghetti hangs ruined on the palermo vines. The reason is a long, needle-like organism called Troglodytes pasta. or spag worm. This seemingly harmless creature does untold damage to the spaghetti vine.