The effects of La Nina, characterized by cooler-than-normal waters in the Pacific Ocean causing dry weather in some parts of the globe and heavy rainfall in others, is likely to impact global food supply and prices going into 2021.

“Past La Ninas have created significant market volatility and raised prices for many foods, and the current edition is already pushing up prices of crops such as corn and reducing supplies of pineapples and mangos,” Wall Street Journal writer Lucy Craymer reported last week. “This event has the potential to...