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Dithiopyr

Type: Herbicide

Mode of Action: Inhibiting the cell division in the meristematic tissue of plants

Common Product Names: Dimension

What is it?

Dithiopyr is a selective herbicide, meaning it targets specific types of weeds without harming desired plants, such as turfgrass. It is primarily effective as a pre-emergent herbicide, which means it is applied before weed seeds have the chance to germinate and emerge from the soil. It can also provide early post-emergent control of certain weeds if applied during the early stages of their growth. Dithiopyr is commonly used in both residential and commercial settings due to its long residual activity, which provides extended protection against weed emergence. The compound is absorbed by the weed seeds during germination, effectively stopping their growth before they become established.

How does it work?

Dithiopyr works by interfering with the cell division process in weed seeds as they begin to germinate. When applied to soil, it creates a protective barrier that targets young seedlings as they start to grow. The herbicide disrupts microtubule formation, a critical step in cell division, thus preventing the weed from developing beyond the seedling stage. For best results, Dithiopyr should be applied before weed seeds germinate, typically in early spring. If used as a post-emergent, it is only effective on very young weeds (usually within the first one to two leaf stages). The herbicide remains active in the soil for several weeks, providing a long-lasting defense against new weed germination.

Benefits

  • Effective Pre-Emergent Control: Highly effective at preventing the germination of a wide variety of annual grasses and broadleaf weeds.
  • Long Residual Activity: Provides extended protection, reducing the need for frequent reapplications.
  • Selective Herbicide: Safe for use on established turfgrass and ornamentals without damaging desired plants.
  • Versatile Application: Suitable for use in various settings, including residential lawns, commercial landscapes, and golf courses.
  • Reduced Competition for Resources: By preventing weed growth, Dithiopyr helps ensure that turfgrass and ornamental plants have better access to water, nutrients, and sunlight.
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