For an administrator at the site, wanting to do an email to the parents who answered Yes to the Pesticide Notification:

KEEP STU AUT IF AUT.CD = APN AND AUT.ST = 1 

Then go to School Info, Send Emails. Click on "Add Recipients" 

On the "Search for Email Addresses by" screen, choose "All Students Kept"

De-select "Students"

Click on "Add All"

Click OK. It takes you back to the body of the email.  Compose email, and click Send Email.