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Why the 'fall armyworm' is a very big problem for farmers

13 June 2017 Last updated at 17:13 BST

Some parts of Africa are being affected by a pest known as the "fall armyworm".

But it's not a worm, despite its name. It's actually a hungry caterpillar that is eating crops.

It's a big problem for farmers because it is eating maize and other crops, which people depend on for food.

What's making it worse, is that it is a new pest, so farmers and the government don't know how to get rid of it.

Take a look at Jenny's report to find out more...