This chemistry wordoku takes a look back at a chemical once sprayed on a kitchen staple

Solve this wordoku in the same way as a sudoku with letters instead of numbers (each of the nine letters in each row, column and nine-square cell). Once solved, one of the overall diagonals can be rearranged to give a fungacide which was previously widely used on stored potatoes.

This week’s letters are: A C E I M N S T Z