T OP CROP MANAGER PLANT BREEDING CORN KNOW. GROW. JUNE 2015 TILLAGE 6 | Wheat breeding: Amazing changes Four decades of wheat breeding on the Prairies. By Carolyn King 16 | What’s up with corn? Still an important crop in Ontario, corn production continues to evolve. By Rosalie I. Tennison 22 | Conservation tillage through the decades No-till ﬁrmly rooted on the Prairies. By Bruce Barker 6 PHOTO COURTESY OF CAM BARLOW, AAFC. 16 22 FILE PHOTO. From left to right: pea, canola, soybean, corn, wheat. FILE AND STOCK PHOTOS. PLANT BREEDING CORN TILLAGE 10 Development of canola in Canada By Carolyn King 14 The threats remain the same By Rosalie I. Tennison 28 Controlled trafﬁc farming By Bruce Barker PESTS AND DISEASES SOYBEAN FLAX 18 CPB is still a huge problem By Donna Fleury 30 Soybean rust monitoring By Carolyn King Weed competition in soybeans By Rosalie I. Tennison 40 Flax acres slowly rebuilding By Bruce Barker ISSUES 32 CANOLA 34 History of herbicide resistance By Carolyn King 44 48 Hairy canola and ﬂea beetles By Donna Fleury STORAGE SOILS 38 Importance of soil sampling By Donna Fleury Preventing potato diseases in storage By Donna Fleury FROM THE EDITOR 4 Celebrating 40 years in agriculture By Janet Kanters ON THE COVER: Readers will find numerous references to pesticide and fertility applications, methods, timing and rates in the pages of Top Crop Manager. We encourage growers to check product registration status and consult with provincial recommendations and product labels for complete instructions. TOP CROP MANAGER | June 2015 3 FILE PHOTO.