When it comes to beautiful devastation, these pests have it covered.

In an effort to call attention to the impact of invaders–whether insect or plant–on food security and the environment, the International Plant Protection Convention recently wrapped up a photo contest called Pests Without Borders.

So, how big a deal are agricultural pests? Very big, IPPC says, especially because they travel the globe, packed in with the plants and flowers and fruits we bring into our stores and homes.

For example, in Southern Italy, olive trees are succumbing to a foreign bacteria that may reduce the harvest by nearly half. Italy is second only to Spain in global olive oil production, and, not to start any fights here, but many chefs consider it the best in the world. Less olive