A Victorian avocado grower says the loss of crops to heat stress has highlighted the effects of climate change on his farm.

Steve Marshall normally picks about half a million avocados a year from his Mornington Peninsula orchards.

But Mr Marshall said he will not pick a single piece of fruit this season after a heatwave wiped out his entire crop last summer.

Mr Marshall said it was the second time he had lost a crop to heat stress.

He said his experience with the damage from days of extreme heat had forced him to consider the effects of climate change.

"If I was writing the book on how to look at growing [avocados] on the Mornington Peninsula [this would] be a whole other chapter," he said.

"It's just adaptive learning along the way."

Mr Marshall said a period of hot weather between Christmas and New Years Eve saw the temperature rise to 44.5 degrees in one of his orchards.

"All our new fruit was pea-sized at that point in time and [the heat] just burnt it all off," he said.

"And the same for most of our other properties across the peninsula, so I've got a year off this year."

Mr Marshall said he believed the extreme heat was a sign of the changing climate, which has led him to consider adapting his farming practices.

"Whether it's climate change or global warming, the fact is we're seeing 40-degree days on the Peninsula, which I've never really noticed before," he said.

"We've been looking to [growers in] Mildura and that area where they use small amounts of water in sprinklers over the trees to increase the humidity, cool and reduce the water loss."

Mr Marshall said he was trialling such technology to use on days of high temperature on his orchards.

He said now was the time to work on strategies to mitigate risk of extreme weather events.