This is simply just not true. We've accurately known the effects of a lifetime of exposure to pesticides for decades using animal models.
What does a rise in any of these things have to do directly with our diets? Also, autism and definitely adhd didn't really start being diagnosed until 50 years ago, so I would imagine they have spiked since then.
Plus if you are going to bash the seed companies, be consistent and mention that the drug companies make a damn killing off all of those ADHD prescriptions.