August 13 Quiz Jay Whetter August 13, 2014 Leave a Comment 1. What is a pre-harvest interval (PHI)?The required time between spraying a crop and cutting it — either by swathing or straight combining.The required curing time for swathed canola.The required time between spraying a crop and combining it.The required time between spraying a crop and delivering it. 2. What is the key reason for pre-harvest intervals? Because applying crop protection products too close to harvest can kill canola plants.Because harvest is a vulnerable stage for beneficial insects.Because applying a product too close to harvest may result in higher than accepted residue levels in the seed.Because crop protection products applied too late have a much higher carryover risk. 3. How many insecticides have a pre-harvest interval of less than seven days?0157 Loading...
