The Holland Marsh, Ontario is a major carrot-producing area in North America. Carrot weevil (CW) and carrot rust fly (CRF) are serious pests of carrots in the Holland Marsh, and current integrated pest management programs (IPM) no longer provide an acceptable level of control for either pest. This thesis investigated the efficacy of different control tactics to improve IPM of CW and CRF in the Holland Marsh. Applications of Rimon (novaluron) consistently reduced CW damage compared to other tested products, especially when applied at least twice, starting at the 2nd true leaf stage. Seeding carrots in late May or early June resulted in significantly less CW damage than carrots seeded earlier in the spring and were therefore identified as a possible cultural control of CW. Celery and carrot oils were attractive to CW and could be used in field traps to improve monitoring later in the growing season. ; Fresh Vegetable Growers of Ontario ; Bradford Co-op Ltd. ; Belchim Crop Protection Canada ; Corteva Agrisciences ; Ontario Ministry of Agriculture, Food and Rural Affairs