preemergent herbicides造句

• "' Dithiopyr "'is a preemergent herbicide for crabgrass control in turf and ornamental grasses.
• In ornamental plantings, preemergent herbicides such as pendimethain, oryzalin, or trifluralin can control seedlings.
• Dithiopyr acts primarily as a preemergent herbicide but can also be used in early postemergent control of crabgrass.
• Other techniques reported effective are to fertilize with greater than two pounds of nitrogen per thousand square feet annually, and use of preemergent herbicides, isoxaben.
• Recommendations include planting a non-host crop for several years after the infestation, pulling up host crops immediately, particularly before the dodder produces seed, and use of preemergent herbicides such as Dacthal in the spring.