b'to disinfect equipment in order to limit soil transfer from onecontrol, and maybe impossible, but doing all you can to reduce field to another, and discuss the merits of extending rotation tothe chances of contaminated soil entering your land is critical, limit the host crops ability to produce new spores. They alsohe said. advise growers on new clubroot-resistant varieties.The Canola Council of Canada is still working on a clubroot We do restrict the growing of canola for three years if we findrecipe. The idea, said Orchard, is if the recipe is followed then clubroot in a canola field, said Fleischer. the desired result is likely. If ingredients are left out, however, Fleischer reminds growers that clubroot spores will still bethe desired result will not be achieved. present in infected fields even when they are not in canolaThe basic recipe is as follows: production. And spores in the soil can be carried on equipment SCOUT, SCOUT, SCOUT!going in and out of the field. Take a minimum two-year break from canolaJust because there are no visible symptoms on wheat and Use clubroot-resistant varieties before clubroot establishesbarley, doesnt mean youre not going to transfer spores from Reduce tillage/soil movementthat infected field to another canola field, where youre going to Control host weeds within three weeks of emergencespread the disease, said Fleischer. Limit the introduction of foreign soilSince soil can be transferred via wind and water, FleischerSpore numbers seem to be the key, said Orchard. Keeping recommends leaving soil covered to further stop spread.spore loads low and local is a bit of a tagline.Weed control also plays an important role in spread as well.When a susceptible crop is grown in a clubroot-infested field Brassicaceae family weeds, like stinkweed, flixweed, wildthe amount of spores produced is astronomical. Per plant, more mustard, volunteer canola and shepherds purse, act as vectorsthan 16 billion spores could be produced. Its an amount that as well and can aid in spore reproduction. If there is no hostOrchard says is unmanageable. crop, then the spores will just die out, but that could take up toClubroot spread is patchy and variable, and soil sampling 20 years, said Fleischer.isnt reliable enough to detect its presence in some cases. Dan Orchard is the Canola Council of Canadas lead contactGrowers need to use a combination of resistant varieties and on clubroot. He echoes Fleischers advice saying that it isrotation as a proactive management strategy, said Orchard. important to make sure no outside soil is introduced to the farm.Although Clubroot Steering Committee members have Some of the means of clubroot transmission could be hard todiscussed proper rotation of resistant varieties to avoid the THIS GUY JUST pIcked Up 44MT of perfecTlY TreaTed wHeaT In 38 MInUTeS!Search G40 Seed Treater on YouTubeand see for yourself.www.seedtreating.comBrian EllisPhone: 403-556-2846 Fax: [email protected] 2019 57'