Mostly because of all the pesticides. Norwegian strawberries are sprayed about 13 times before they are harvested and it is allowed to spray them as late as three days before harvesting.
Diseases are a problem, but mostly when there's a lot of rain. I have found two things to do to avoid this:
1. Don't plant your strawberries in a field, but in between flowers and vegetables. For example in a row in front of a flower bed.
2. Have some in containers you can place under roof in their most busy growing & harvesting time.
And here's my top 3 most rewarding crops in the garden:
1. Strawberries
2. Potatoes
3. Leaf salad
P.S. I thought about finding an image from Etsy with a strawberry design. But very soon I realized that I wouldn't find any. There are now successful way strawberries can be incorporated in a piece of good design, is there? Why is it so difficult to make something look good with strawberries on?