Preemergent application (PRE)

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1. The application of herbicides to prevent the germination of weeds that have not yet appeared. See also postemergent application (POE).

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This product is labelled for both preemergent and postemergent application (POE) for some crops and weeds.
Source: http://www.syngenta.ca/prodrender/index.asp?nav=PESTS&ProdID=908