Your seed might have weed seeds in it and still make certified. Certified #1 seed for canola is allowed 1 noxious weed seed per 25g sample and 5 other seeds per 25g sample. Only registered and foundation are allowed no primary or secondary noxious per 25g sample but are still allowed 5 other seeds per 25g. These numbers are available at the department of justice website at laws.justice.gc.ca.
I'm pretty sure the dekalb variety you grew has non RR males, so that's probably the weed source. The females are sprayed with roundup and are very clean but the males are sprayed with conventional canola chemistries and can have some weed pressure due to the low seeding rates used.
Some weeds are put on the noxious list for a certain crop because of the inability to clean them out of a sample. Mustard is the best example in canola. If your weed seeds are of a very different seed size and weight, chances are there was a breakdown at the cleaning plant. Something wore out, leaked a little, then broke and was fixed. Stuff happens, even though noone wants to talk about it.
I'm pretty sure the dekalb variety you grew has non RR males, so that's probably the weed source. The females are sprayed with roundup and are very clean but the males are sprayed with conventional canola chemistries and can have some weed pressure due to the low seeding rates used.
Some weeds are put on the noxious list for a certain crop because of the inability to clean them out of a sample. Mustard is the best example in canola. If your weed seeds are of a very different seed size and weight, chances are there was a breakdown at the cleaning plant. Something wore out, leaked a little, then broke and was fixed. Stuff happens, even though noone wants to talk about it.
Comment