July 29 Quiz — PHI Jay Whetter July 29, 2015 Leave a Comment Four questions to test your knowledge on pre-harvest intervals. 1. If the PHI of “x” pesticide is 15 days, there will be no residue issues if: (Two of the choices below are correct. Select both of them.)Canola windrows are combined 15 days after application.Canola is straight cut 15 days after application. Canola is swathed 15 days after application. 2. The pre-harvest interval for chlorpyrifos (Lorsban, Pyrinex, Nufos, Citadel) is 60 days for wheat, barley and oats, and 42 days for sunflowers. What is it for canola? 42 days30 days21 days10 days 3. The Group 14 product Heat is now available as a straight combining aid to help dry down canola and any weeds present. What is its pre-harvest interval? 3 days7 days10 days14 days 4. Many of the fungicides registered for sclerotinia stem rot management in canola have PHIs from 30 to 40 days. For applications at mid-flowering when swathing is likely to be less than 30 days away, products with a shorter PHI may be necessary. What is the shortest PHI you can find for sclerotinia fungicides? 28 days21 days14 days7 days Loading...
