Previous crop may have been potatoes or other solanaceous crop. Symptoms are most pronounced in the planting year.
Verticillium wilt
Verticillium wilt, caused by the fungus Verticillium spp. is the culprit for the strawberry symptoms pictured below, although only a laboratory test can determine this with certainty.
Verticillium is most likely to occur in fields where potatoes, tomatoes or other solanaceous crops have been planted previously. Solanaceous weeds, such as nightshade are also hosts for the disease. Typically, the outer leaves of Verticillium infected plants die first, leaving only a few green leaves in the center of the plant. Some strawberry varieties are resistant to Verticillium Wilt.