Bulletin number 10, 7/27 – 8/2

Welcome to bulletin 10 for the 2020 growing season. Download the spore trapping potato data here. The excel spread sheet require a password to open. Email us to request access to the data.

No spores of P. infestans (late blight) were detected at any of the spore traps in Idaho this week. With the hot dry weather in place over the Snake River Valley conditions are not suitable for late blight infection or spread. Several weather stations across the region recorded temperatures over 100 F this past week for several days. The optimal temperature for late blight infection is between 60 – 72 F and the pathogen will stop growing when temperatures are above 85 F.