"The problem with that is lemons don't react well to the fumigation process. So importers are reluctant to bring lemons in because of the process, which is causing a shortage of arrivals."
Thompson is one of a shrinking number of New Zealand growers producing lemons in the summer.
He had just harvested 25 tonnes of the Yen Ben variety, which hit the market a week ago and sold pretty quickly because of demand, he said.
"The Yen Ben Lemons are the main lemons in New Zealand, 70 per cent of their crop is produced in the winter months from July to September."
The bulk of that crop was exported to Japan, Korea, China and the United States, Thompson said.
"And, the 30 per cent of the crop that is produced in the summer is quiet a small volume because a lot of lemons have been removed and replaced with gold kiwifruit."
That reduced the amount of lemons available in New Zealand, Thompson said.