Will spraypesticides on the Orange trees prevent the bees from pollinating them

It will kill the bees. Figure out what lists you have and find a better way to deal with them. They can advise you at the store. You can even bring a sample in a sealed plastic bag and they can ID it and give you advice.

As far as I know yes

Hi Eric, We are happy to point you in the right direction to treat your orange trees without resorting to pesticides that harm bees. Stop by any time, and bring a sample in a plastic bag to show our team what you are trying to treat. Thank you for checking with us!