Quiz August 10, 2022 - Issue 20 August 10, 2022 QUIZ – Pre-harvest timing 1. A scenario: Canola is at 30 per cent seed colour change on the main stem. If the yield potential is 40 bu./ac., what is the economic advantage, at today’s prices, to waiting a week or so and cutting when canola is at 60 per cent seed colour change?$10 per acre$20 per acre$40 per acre$80 per acre 2. Late season applications of insecticide and fungicide may not provide enough time between spraying and crop cutting. The spray-to-swath calculator shows the pre-harvest intervals for specific products. What is the pre-harvest interval for fungicides Miravis Bold and Azoshy 250 SC? 7 days21 days28 days30 days 3. A Canola Watch articles describes a few scenarios around frost risk and crop staging. What does the article say about crop at 5% seed colour change with heavy frost in the forecast – swath now or leave it standing?Swath nowLeave it standing 4. The new shatter rating system for canola cultivars will indicate how long farmers can leave a cultivar standing before it should be harvested. Is a cultivar with a “4” rating ideal for straight combining? NoYes 5. Pre-harvest glyphosate may only be applied to canola when grain moisture content is less than 30% in the least mature part of the field. To estimate the proper timing, apply glyphosate at or after what canola stage? The end of floweringWhen seeds in top pods are brown-blackThree weeks before straight combining50-60% seed colour change Loading... Five questions on swath timing, frost risk, pre-harvest intervals, pre-harvest glyphosate and pod shatter.