In 2009, Liberia had to declare a state of emergency in 3 counties because of an African armyworm caterpillar invasion. Tens of millions of the larvae appeared and began eating through their green crops and contaminating the water supplies with their feces. – WTF Fun Facts
Source: https://www.cnn.com/2009/WORLD/africa/01/28/liberia.caterpillars.emergency/index.html