In recent times, Nebraska's wet climate has led to noticeable changes in weed species in pastures. Among these, larkspur has gained attention for its rapid spread and related problems. At the Panhandle Research, Extension and Education Center in Scottsbluff, ranchers have actively sought advice on managing this troublesome weed.
Larkspur, belonging to the Delphinium species, is native to Nebraska. It's not just any ordinary plant. It poses significant dangers to cattle due to its toxic nature. The most prevalent variety, Prairie larkspur, displays white or pale blue flowers. Meanwhile, Geyer and twolobe larkspur, predominantly found in the panhandle, flaunt light blue or violet blooms.
The primary concern with larkspur lies in its toxicity. It contains harmful chemicals that can be lethal to cattle if ingested, even in small amounts. As the growing season progresses, the risk diminishes. Interestingly, sheep appear to handle larkspur better throughout the year.
So, what can ranchers do?
The easiest method is adjusting cattle grazing schedules. For those seeking a more proactive approach, herbicides might be the answer. Two leading products, Tordon® 22K (picloram) and Escort® XP (metsulfuron-methyl), have been green-lit for larkspur control. But a word of caution - picloram products, due to environmental concerns, are restricted use and require an applicator license.
For those choosing the herbicide route, timing is crucial. Different stages of larkspur growth require varied treatments. And while herbicides can be effective, they should be used judiciously to protect other beneficial plants.
All in all, as larkspur growth increases in Nebraska, ranchers are on high alert, taking steps to ensure the safety of their livestock.
Photo Credit: istock-cactusoup
Categories: Nebraska, Livestock, Weather