The symptoms shown on the strawberry on the right hand side is called phyllody, or a phylloid condition, where parts of a plant that shouldn't, turn leafy.
There's been some research in the USA to indicate that it can be caused by contamination with glyphosate weedkillers at certain points in the plant's growth, but this isn't conclusive. Other plants get this too, it can happen on flowers etc, and can be caused by other irritants, not just pesticides.