The phrase references a challenge encountered when solving crossword puzzles, where the solution pertains to a pesticide formerly used on apple orchards but later prohibited due to health and environmental concerns. The clue directs the solver to identify the specific name of this disallowed substance. For example, a crossword clue might read “Outlawed apple orchard treatment” with the answer being a chemical compound matching the number of squares provided.
The significance of solving such a clue extends beyond simple wordplay. It highlights historical changes in agricultural practices and societal awareness regarding the impact of chemical use on public health and the ecosystem. Successfully deciphering the answer demonstrates familiarity with both past agricultural techniques and the evolution of environmental regulations. The appearance of such a clue in a crossword acts as a subtle reminder of potentially harmful substances that were once widely accepted.