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Florasulam

Type: Herbicide

Mode of Action: Inhibiting the enzyme acetolactate synthase (ALS)

Common Product Names: Defendor & Quelex

What is it?

Florasulam is a highly effective herbicide used in post-emergent weed control in cereal crops. It is particularly valuable in managing broadleaf weeds that can compete with crops for nutrients, water, and sunlight. Florasulam's selectivity and low use rates make it a preferred choice for farmers looking to protect their crops without causing harm to the environment. Its chemical structure allows it to be quickly absorbed by the leaves and translocated throughout the plant, leading to the inhibition of growth in targeted weeds. The effects of Florasulam on weeds are typically visible within a few days after application, with full weed death occurring within 2-4 weeks.

How does it work?

Florasulam works by inhibiting the ALS enzyme in susceptible weed species. Once absorbed by the leaves, it is translocated throughout the plant, disrupting the synthesis of essential amino acids. As these amino acids are crucial for plant growth, the weed's growth ceases almost immediately, leading to yellowing, stunting, and eventual death of the weed. Florasulam is particularly effective against weeds like chickweed, cleavers, mayweed, and common poppy.

Benefits

  • Selective Weed Control: Targets broadleaf weeds without harming cereal crops.
  • Low Application Rates: Effective at low use rates, reducing the amount of chemical needed.
  • Rapid Action: Visible results within a few days of application.
  • No Residual Activity: Florasulam has minimal residual activity, which reduces the risk of affecting subsequent crops.
  • Previous article Spiromesifen

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