4 Recognize That Drought-stressed or Mature Weeds Will Be More Difficult to Control. Effectiveness may be reduced if weeds don’t have adequate moisture and aren’t rapidly growing when you spray. In a dry year, spraying early will improve results and help your grass capture scarce moisture. Weed-free pastures always recover faster from drought. The key is to spray early when conditions are acceptable. For late applications or less favorable conditions, you’ll need to increase the application rate for satisfactory control. 5 Follow Label Directions for Application and Mixing. For ground broadcast, apply the recommended rate of herbicide in 10 to 20 gallons of total spray mixture per acre. Use the recommended rate of an agricultural surfactant to thoroughly wet the foliage; NovaGraz™ herbicide, for example, requires methylated seed oil (MSO) as a surfactant. Consider a drift control additive to reduce drift and improve deposition. 6 Remember Soil Residual Activity and Plant Residue. Although HighNoon® herbicide can provide weed control for several weeks in permanent grass pasture, it should not be used on cropland or on land to be rotated to crops. Most broadleaf crops are more sensitive to residual activity than weeds. Those crops may be affected if planted within two years, or longer, of spraying. Don’t plant a broadleaf crop until an adequately sensitive field bioassay shows the crop will not be harmed. Cereals and corn, however, can be planted one year after treatment. Remember grasses treated with any soil residual herbicide may carry herbicide residue that can be transferred to the soil by hay or by livestock manure or urine. Contact your local retailer or Corteva Agriscience Range & Pasture Specialist for more localized recommendations to customize your pasture improvement.
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Check out the Range & Pasture Western Weed & Brush ID Guide for more information!
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™ ® Trademarks of Corteva Agriscience and its affiliated companies. White clover and Annual lespedeza exhibit some initial injury (such as lodging and loss of vigor) but recover. Under normal field conditions, HighNoon ® is nonvolatile. HighNoon has no grazing or haying restrictions for any class of livestock, including lactating dairy cows, horses (including lactating mares) and meat animals prior to slaughter. Label precautions apply to forage treated with HighNoon and to manure and urine from animals that have consumed treated forage. Consult the label for full details. HighNoon and NovaGraz ™ are not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ©2025 Corteva.
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