In parts of Argentina, frosts have actually increased in recent winters, but some key farming areas have had a substantial decline. Nationally, minimum temperatures have been rising and cold nights decreasing over decades.
A study by scientists at Argentine universities and state institutes showed that from 1963 to 2013 the average number of cold nights decreased from 15 days per year to around eight.
Fewer frosty nights help leafhoppers, which cannot tolerate temperatures below 4 degrees Celsius, said Fernando Flores, entomologist at the National Institute of Agricultural Technology (INTA).
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