Pests seem to be one of the biggest problems when growing outdoors. They are often a massive pain in the ass and can cost a grower a lot of time and money when trying to deal with them. The best way to deal with them is to prevent them from getting to your plants in the first place.
Here is a great video from Jorge Cervantes about Worms and Pests
And here is a longer video with more in depth detail into how to deal with a range of pests