Potato leafhoppers pose a significant threat to alfalfa crops in Nebraska, particularly during the second and third cuttings. While these pests do not overwinter in the region, they are carried in by southerly winds. Recent reports indicate their presence in southeast Nebraska. Now is the ideal time to initiate scouting efforts to identify and mitigate any potential damage.
Potato leafhoppers are small, bright green, wedge-shaped insects measuring only 1/8 inch in length. Their feeding habits result in a distinct yellow or purple triangle shape at the tip of alfalfa leaves. New spring-planted fields and those planted the previous year are particularly vulnerable to infestation.
Although resistant varieties offer some protection, seedling-stage alfalfa may still sustain damage. It is crucial to scout all fields, including those with resistant varieties, as large leafhopper populations can still cause problems.
Scouting for potato leafhoppers requires the use of a sweep net, as it is the most reliable method. Treatment decisions are based on the number of leafhoppers captured. The decision-making process is further aided by dynamic treatment thresholds, which vary depending on the height of the alfalfa and the value of the hay.
Several insecticides, such as Mustang, Warrior, Baythroid, and others with similar active ingredients, are registered for control and provide effective results when applied correctly.
For more detailed information on suggested insecticides and specific treatment thresholds, refer to the University of Nebraska-Lincoln Extension Circular 130.
By starting your scouting efforts now, you can detect and address potato leafhopper infestations promptly, safeguarding your alfalfa fields from potential damage and ensuring a successful harvest.
Photo Credit: gettyimages-goodlifestudio
Categories: Nebraska, Crops, Alfalfa, Harvesting