Hot weather has stressed the Northwest onion crop and increased instances of iris yellow spot virus, say industry experts. Onion crop producing states like Idaho and Oregon have exceeded 100 degrees for 20 days so far this year, up from the annual average of six days. The heat is likely to cause the fields to mature about a week faster than normal with yields decreasing up to 25%. Find out how this may affect the market for storage onions in the months to come.