Sharpen awareness of how to avoid pesticide resistance

Three horticulture specialists with Ontario’s ag ministry will be offering a lunch and learn series on pesticide resistance from January 25-28, 2021. They are entomologist Hannah Fraser, pathologist Katie Goldenhar and weed management specialist Kristen Obeid.


This series on pesticide resistance management is to give field growers with fruit, vegetable and specialty crops a holistic view on pesticide resistance. The experts will cover basics of pesticide resistance then dive deeper into insecticide, herbicide and fungicide resistance and management. Sessions will start each day at 12PM with a 30-minute presentation followed by question and answer period.


Resistance 101

Monday January 25th, 12-1 pm

• Impact of resistance
• How resistance occurs
• Resistance drivers
• Mechanisms of resistance
• Challenges to management
• Foundations of resistance management
• Resources for success


Insecticide Resistance

Tuesday January 26th, 12-1 pm

• 16,000 cases and counting
• Mechanisms of pesticide resistance in insects and mites
• Risk factors beyond your control
• How agronomic practices can drive selection pressure
• Spraying by the numbers: IRAC MOA groups and your IPM program


Herbicide Resistance

Wednesday January 27th, 12-1 pm

• Mechanisms of herbicide resistance
• Herbicide risk (WSSA groups, low vs high risk products)
• Weed risk – Current resistant weed situation: Focus on Amaranthus spp.
• Agronomic Risk (practices that increase herbicide resistance risk)
• Herbicide resistance management


Fungicide Resistance

Thursday January 28th, 12-1 pm

• Fungicide risk (FRAC groups, multi-site vs single-site, low vs high risk products)
• Diseases at risk (diseases at high risk, factors that increase resistance)
• Agronomic practices that can decrease resistance risk
• Fungicide resistance management (BMPs when using fungicides)


Register for the Zoom lunch and learn, here:



Source:  ONVegetable December 29, 2020 newsletter





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