By Scout Nelson
Nebraska's weekly forage update highlights three major concerns: smart irrigation of alfalfa, control of yucca plants on rangelands, and continued monitoring of alfalfa weevil feeding.
Alfalfa irrigation should be managed carefully in June. Due to cooler temperatures, daily water needs are lower — typically less than ¼ inch. Overwatering can lead to plant injury and weed invasion. Because alfalfa doesn’t have specific water-critical stages, it tolerates some drought by going dormant. Watering just before the second cutting and again in the third and fourth stages can improve yield.
Growers are advised to stop irrigation two to three days before cutting and resume when new growth begins. Soil moisture tools and weather forecasts can improve irrigation scheduling.
Yucca, also known as soapweed, continues to spread on drier rangelands. These plants have deep taproots and sharp leaves, competing with grass for moisture. Herbicide options like Remedy Ultra or Velpar are effective when applied directly to plants.
Spot-treating small patches is cost-efficient and helps prevent spread. In some cases, winter grazing has helped reduce yucca, as cattle feed on the tender parts when few other green plants are available.
Although the first alfalfa cutting is complete in many fields, alfalfa weevil activity may still affect regrowth. Adults and larvae can feed on new shoots, slowing recovery. Scouting is recommended if regrowth is delayed. Cut 10 stems at each of five random sites, shake them into a white bucket, and count larvae. Damage thresholds vary. Reports of insecticide resistance in some states make it important to consult local Extension offices for up-to-date guidance.
“Scouting for alfalfa weevil is simple and can help mitigate economic losses.” Staying alert to field conditions can save both forage quality and farm costs.
Photo Credit:gettyimages-goodlifestudio
Categories: Nebraska, Crops, Alfalfa