California accidentally imported Argentine ants in the early 1900s, but the invasive insects now protect aphids across citrus orchards, allowing sap-sucking pests to multiply and damage millions of dollars' worth of fruit each year

As you cut into a delicious and juicy orange or add fresh lemon juice to your breakfast plate, it is hard to imagine how many steps there have been between its growth and finally ending up on your kitchen table. Citrus fruit is a common part of many diets.

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