Western Australia will hold its first avocado festival this weekend as industry stresses for the need for more marketing.

Avocado production in the state has grown by 30 per cent in the past three years from 18,575 tonnes in 2012-13 to 24,000 tonnes in 2014-15.

The industry is now worth approximately $150 million to the West Australian economy.

But many in the industry have growing concerns about the rapid growth of the industry and the potential for supply to outstrip demand.

Pemberton avocado producer Russell Delroy is one of the largest growers in the state.

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He runs a packing shed in Donnybrook and exports approximately 90 per cent of his fruit interstate.

Mr Delroy said the future for avocados was challenging.

He said there has been "a tremendous amount of planting" of new trees in the south west of the state because of the success and profitability of the crop.

"We estimate that production will at least double and possibly treble over the next decade," he said.

"That's going to present some very real challenges on where we are going to be able to sell all of this fruit."

Growers will hold the first dedicated West Australian avocado festival at Araluen Botanic Park in Roleystone this weekend.

Mr Delroy said more promotion and marketing events would be needed in the future to support the expanding industry.

He said more needed to be spent on promotion to increase demand.

"Trying to get the next increase in consumption is going to be incredibly difficult," he said.

"And we probably need to spend an increasing amount on marketing."

Avocado trees are biennial, which means the crop will produce higher yields one year, and lower yields the next.

But Mr Delroy said he estimated that production was going to be about 90 per cent of the 2014-15 record 24,000 tonne crop.

Manjimup avocado grower Jamie Nicolaou just started to harvest this week and said his orchard would likely produce 50 to 60 per cent of the previous crop. Manjimup farmer Jamie Nicolaou has just begun his 2015/16 avocado harvest. ( Bridget Fitzgerald )

But he said that was higher than expected.

Mr Nicolaou said Western Australia did have the competitive advantage of growing a higher quality product.

But he said the combination of new trees being planted this year, as well as trees that have been planted in the last five to eight years was concerning.

"There's not much we can do about it," he said.

"You've just got to work with it."

Mr Nicolaou said growers needed to focus more on quality of product over quantity.