Canola Watch quiz – clubroot Jay Whetter September 8, 2016 Leave a Comment Check pre-mature ripening areas for diseases, digging up roots to look for galls. Credit: Dan Orchard 1. At what concentration of clubroot spores per gram of soil are you likely to start seeing field symptoms?8-10800-1,00080,000-100,0008-10 million 2. Fill in the blank: Heavily-infested fields in Alberta can have _________ or more clubroot spores per gram of soil.10,000100,0001,000,00010,000,000 3. Tillage is the fastest way to spread clubroot within a field. If distributed evenly, just one gram of heavily infested soil (the volume of a Smartie) contains enough spores to seriously infest how much canola?10 square feetOne acreOne quarter sectionA whole farm Loading...
