ODA pesticide license: Turf and Ornamental

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Study material for the Turf and Ornamental category for the Oregon Department of Agriculture pesticide applicators license exam

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contact herbicide

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.

selective herbicide

control weeds while doing little or no damage to desirable plants. You must understand the reasons for selectivity to avoid injuring desirable plants.

nonselective herbicide

kill or control almost all plants or weeds including desirable plants