I just received a very interesting question that I am not able to locate any information on. I'm putting it out to you in hopes that someone might be familiar with a recent article or published research that would provide some answers. Here's the question:
" I’ve been wondering about sunflowers as common bird-feeder seed, as sunflowers are one of the crops regularly seed-coated with neonicotinoids. Only informaition I can find is this American Bird Conservancy article: http://www.birdingbusiness.com/the-magazine?id=94.
I follow the news on neonicotinoids closely but from the perspective of impact on pollinators, but have not seen much discussion on birds, particularly this question of sunflowers and bird feeder food. As neonicotinoids are systemic, I would think the resulting seeds of seed-treated crops would continue to harbor some level of the insecticide. I’m seeing it is toxic for songbirds to directly ingest the neonicontinoids-treated seeds, but I’m not getting a clear message about the resulting seeds grown from such and their impact on birds and whether the common bird seed sold is from seeds that were grown from seed-treated sunflowers."