Seeking to list pesticide requirements for families of crops eg. solanaceae. Choosing the family would then show a list of plants in that family eg. family: solanaceae; planttype: tomato. Selection of tomato would then display a list of the pests and diseases of tomatoes. selection of a pest may then show a list of active ingredients (pesticide) to apply. I am seeking a start in getting this logic working. I have started the database design in Access. In this you should be able to see the table relationship.