Dear Parmeshwar
If you are selling organic certified products I am assuming your manufacturing site is certified as organic?....
If this is so there will be a standard from your certification body that you are obliged to follow to ensure segregation between organic & non organic and to sell your products as organic.
The certifying body will provide a standard which will give you advice on what sort of pesticides are permitted (if any) & should be able to provide further advice on compliance.
Your responsibility will be to audit your suppliers and/or request that they have organic certification themselves which is regularly reviewed, as well as regular pesticide screening - conducted at an appropriate frequency.