Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26013618_1 (date_established VARCHAR, name_of_the_nature_reserve VARCHAR)

### Question ###
When was Stellbrookmoor established?

### Accurate SQL ###

SELECT date_established FROM table_26013618_1 WHERE name_of_the_nature_reserve = "Stellbrookmoor"