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| preemergent herbicide ： ウィキペディア英語版 |
preemergent herbicide
Preemergent herbicides prevent the germination of seeds by inhibiting a key enzyme. In some areas of the world, they are used to prevent crabgrass from appearing in lawns.
Preemergent herbicides are applied to lawns in the spring and fall to prevent the germination of weed seeds. They will not affect any established plant. In the spring, they should be applied when air temperatures reach 65–70°F for four consecutive days. In the fall, they should be applied when nighttime lows reach 55–60°F for four consecutive nights.〔(【引用サイトリンク】first=Joey )〕
"Weed and feed" products which contain both preemergent herbicide and fertilizer in a single product should not be used on southern lawns or warm-season grasses. If applied when preemergent herbicide is needed, the fertilizer may burn or stress the lawn. If applied after the lawn "green-up", weed seeds will have already germinated and the herbicide will be ineffective.〔(【引用サイトリンク】first=Jenion )〕
==Brands==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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