Home / Quizzes / August 13 QuizQuiz August 13, 2014 August 13 Quiz 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... E-newsletter sign up +(opens in a new tab)Agronomy Fundamentals Explore articles on the best management practices for yield, profitability and sustainability:Plant Establishment Nutrient Management Diseases Insects Weeds Harvest and Storage Discover More Canola Encyclopedia (opens in a new tab)Past Issues (opens in a new tab)Canola Research Hub (opens in a new tab)Videos (opens in a new tab)
