In all the lists of disease of Strawberries I have looked at none has anything about Strawberry Leaf Wilt so whomever told you that mislead you. Take a sample of the problem, in a sealed plastic bag, to your local office of your state universities USDA Cooperative Extension Service for proper ID. Whether sulfur, which is what Green Earth is, was an appropriate "cure" is not something you can know until what you have is properly identified and any fungicide you uses will also kill off the beneficial fungi in your soil.

Whoops *fail* they called it Leaf Spot of Leaf Blight *Head Desk*

Since the fungicides that would, maybe, control "Leaf Spot" or Leaf Blight" will also kill off the beneficial fungi in your soil you will be further ahead making a new bed and planitng new, problem free plants there and eliminating those diseased plants instead of trying to fix this problem.

Here's some pics I took of infected leafs

Here is a link that might be useful: Pics