Which sentence is correct?
Every apple, every orange, and every pear is good for you.
Every apple, every orange, and every pear are good for you.
Every is singular--even when there are many everys.
Although the simple answer above was down-voted by someone, consider the scope of quantification of every (or, for that matter, each):
Every (man, woman, and child) is invited. Each (man, woman, and child) is invited.
Distributing the quantifier does not change the quantification or the arity of the verb:
Every man, every woman, and every child is invited.