Bob and Allison,
The corn tar spot analyses are attached. You sent 3 dried samples of corn leaves with tar spot. In preparation for analysis, these were ‘ground’ in a kitchen blender and then separated into several subsamples based on size of particle as well as your punched spots so there are four analyses for each of the three samples. This was done to see if grinding was necessary since the leaves could be analyzed intact also. You can get an idea of the size of particles from the photo attached below. The ‘punched leaf’ samples are very coarse and are the large sizes from the blender. The ‘punches’ (#11-13) are the punched out spots from the leaves that you did. The ‘500 mesh’ is the smallest material that passed my 500 mesh screen and the ‘flour sifted’ sample is what I sifted through a kitchen flour sifter (guessing about 200 mesh.)
To read more go HERE.