applied directly to the foliage of the plant, kill only the plant parts they directly contact, do NOT translocate, require uniform spray coverage
translocated herbicide (systemic herbicide)
absorbed through the foliage or shoots and move through the plant. good control requires actively growing plants which are transporting sugars and water throughout the plant to move the herbicide.
control weeds while doing little or no damage to desirable plants. You must understand the reasons for selectivity to avoid injuring desirable plants.
kill or control almost all plants or weeds including desirable plants