Yesterday, I visited a farm with blast in Glenn County. In this case, the grower seeded M-210, and as an experiment, he planted some M-105 in a very small area at the time of clean up herbicide application. This is a location where blast is common. In fact, last year this location had severe neck blast.

Blast showed up on the M-105 but the M-210 is completely clean. The picture below shows some burned leaves and lesions that could be confused with herbicide burn. However, there are plenty of the typical diamond shaped lesions.

Small area of M-105 surrounded by M-210.

Blast burned down some of the M-105 leaves, resembling a herbicide burn. The M-210 does not have any lesions.

Typical blast lesions found around the M-105 burned leaves.