A Preemergence is Refers to the timing of Pest control operations. Preemergence operations are accomplished during the period subsequent to the planting of a crop and prior to the emergence of that crop from the soil.

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Other /More definition:
A Preemergence is Refers to the timing of pest control operations. Preemergence operations are accomplished during the period subsequent to the planting of a crop and prior to the emergence of that crop from the soil.