This episode combines the interview on Purple Spot with Dr. Mary Hausbeck.   Here are the approximate points in the podcast for each topic.

1:00 -- Purple Spot 101
5:30 -- Purple Spot Control

Hausbeck 2-pager on purple spot https://veggies.msu.edu/wp-content/uploads/2023/01/FS-asparagus-purple-spot-updated-2022-Dec.pdf
Two paragraph write up on purple spot from June MSUE vegetable report https://www.canr.msu.edu/news/michigan-vegetable-crop-report-june-14-2023