Foliar sprays Pros and Cons for fertilizing and disease con

[spudleafwillie]

What has been everyone's experience in using foliar sprays for:
1) fertilization, , use of manure tea and other fertilizers

2) disease control using manure tea and/or aspirin.

I am interested in frequency of application and concentration of the solutions

I recently saw a reference from the Univ. of Rhode Island on using aspirin but can't find it. Today must be Spud's senior or Alzheimers day

Thanks,

Spud