The prolonged Californian heatwave is threatening to disrupt supplies of citrus fruit, particularly lemons, leading to an increase in wholesale prices. That should draw in additional imports, which can already be seen in a 58% jump in the value of exports from Mexico to the U.S. in the second quarter of 2018 vs. a year earlier. The potential to draw in more is limited as the U.S. already accounts for 86% of Mexican shipments. Chilean supplies are an alternative as America only accounted for 50% of exports in the 12 months to May 31 ahead of the peak shipping season in July.