Isoproturon is a widely used herbicide in wheat fields, known for its effectiveness against grass weeds and certain broadleaf weeds. Among the various products registered for use in wheat, 50% Isoproturon WP has become one of the most popular choices in recent years due to its efficiency and affordability.
The main advantages of Isoproturon include its broad-spectrum control over grass weeds such as *Echinocloa crus-galli*, *Alopecurus aequalis*, *Poa annua*, and *Avena fatua*. It is particularly effective against invasive weed species that have been increasing in population. Despite long-term use, resistance to Isoproturon has not yet been reported. Another key feature is its wide application window—It can be applied from sowing through the jointing stage of wheat, offering both pre- and post-emergence control. The herbicide also has a short residual period in the soil, making it safe for subsequent crops. Additionally, it offers good cost-effectiveness, which makes it a preferred choice among farmers.
To achieve optimal results, it's important to apply Isoproturon at the right time, with the correct dosage and sufficient water. The best time for application is during the peak emergence of weeds before winter. Applying it too late in spring may result in reduced effectiveness. A typical recommendation is around 62.5 grams of active ingredient per acre before winter, with at least 30 kg of water per mu to ensure even coverage.
According to the China Pesticide Network, Isoproturon is generally safe for wheat but may reduce the cold tolerance of young plants. If applied just before a cold snap, it can cause "frost phytotoxicity," leading to yellowing and stunted growth. To avoid this, it's best to apply it after the first cold spell, when wheat has already acclimated to lower temperatures. This approach, known as "cold tail warm head," helps maintain both efficacy and crop safety. In rice paddies, Isoproturon should only be applied after the rice has been harvested, and the field must be drained to prevent "wet phytotoxicity."
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