Cyanazine

Cyanazine is a herbicide that was introduced in the 1970s. It is a member of the triazine class of herbicides, which also includes atrazine and simazine. Cyanazine works by inhibiting photosynthesis in plants. It is primarily used for the control of broadleaf weeds and grasses in crops such as corn, sorghum, and cotton.

The chemical structure of cyanazine is 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino]-2-methylpropanenitrile. It is a selective herbicide, meaning it targets specific types of plants while leaving others unharmed. Its efficacy is dependent on factors such as soil type, moisture, and weed species. Cyanazine is typically applied to the soil before weeds emerge or to emerged weeds.

Concerns about the environmental persistence and potential for groundwater contamination led to increased scrutiny of cyanazine. While considered less persistent than some other triazine herbicides, its breakdown products could still pose risks. Regulatory reviews and voluntary withdrawal by manufacturers have led to a significant decline in its use in many regions. As a result, cyanazine is no longer widely available or registered for use in many countries. Research into its environmental fate and effects has been conducted to understand its impact on ecosystems and water resources.