Do You Have Poisonous Weeds in Your Pastures and Forages? by Jerry Doll, Extension Weed Scientist UW Agronomy Department 1575 Linden Dr., Madison, WI 53706 Introduction Livestock managers seem to have an increasing awareness that poisonous plants can affect livestock. Part of this is due to the ever-increasing population of horse owners in Wisconsin and to the […]
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Aphanomyces Root Rot in Alfalfa by Dan Undersander and Paul Esker Aphanomyces root rot (Aphanomyces euteiches) is an important alfalfa disease. It occurs all over the Midwest U.S. The pathogen that causes Aphanomyces root rot is an oomycetous fungi that are especially present in wet and poorly drained soils (Schneider et al. 2008). Aphanomyces stunts and kills seedlings. […]
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Root Rot and Crown Rots and Virus Diseases of Alfalfa and Clover by Dean Malvick, Assistant Professor of Plant Pathology Department of Crop Sciences University of Illinois at Urbana-Champaign A goal for many forage producers is to plant alfalfa and clover, harvest high yields on an appropriate schedule, and retain stands for many years. Numerous obstacles, however, prevent […]
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Alfalfa Blotch Leafminer by Bryan Jensen, Integrated Pest Management Program University of Wisconsin – Madison Introduction The alfalfa blotch leafminer (Agromyza frontella (Rondani)) is a relatively new pest in Wisconsin alfalfa. It was first found in the state during the summer of 1996 with positive confirmations in five counties. A 1997 survey of the state showed that the […]
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New Disease-Causing Organisms in Alfalfa: Aphanomyces Euteiches Race 2 and Phytoplasma by R.D. Peters and C.R. Grau Department of Plant Pathology University of Wisconsin – Madison Introduction Alfalfa is the primary forage crop in Wisconsin and is a key element in the states dairy industry. The yield of new varieties is greater than that of Vernal and other older varieties due […]
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Aphanomyces Race 2 in Alfalfa by Dan Undersander, Forage Agronomist About 20 years ago we identified Aphanomyces root rot as one of the major limiting diseases of alfalfa across much of the U.S on poorly drained soils. This fungal disease causes death in seedlings and poor seedling growth of alfalfa in slowly drained fields. Seedlings infected with Aphanomyces […]
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Potato Leafhopper Damage to Alfalfa by D.B. Hogg1, J.L. Wedbery1, D.J. Undersander2, and K.G. Silveira2 The potato leafhopper (PLH) is perhaps the most serious insect pest of alfalfa in Wisconsin and the Upper Midwest. This leafhopper is a native species but is not able to survive northern winters, and adults migrate into the Midwest each spring. Leafhopper populations […]
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An Update on Potato Leafhopper Resistance in Alfalfa by Mark McCaslin and Dave Whalen Forage Genetics Commercial alfalfa breeders have been very successful incorporating multiple pest resistance into high yielding cultivars. Recently released alfalfa varieties often express high levels of resistance to many diseases, insects and nematodes. However, until recently breeders were unsuccessful in incorporating resistance to […]
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Disease Profile: Aphanomyces Root Rot of Alfalfa by Quinn Watson and Damon Smith Aphanomyces Root Rot (ARR) is a significant monocyclic seedling disease caused by the fungus-like plant pathogen, Aphanomyces euteiches. The disease afflicts a variety of legumes, including soybean, alfalfa, snap bean, faba bean, red kidney bean, red clover, and white clover, and causes a dramatic reduction […]
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Costs and Benefits of Roundup Ready® Alfalfa in the Establishment Year by Mark J. Renz1 Weed suppression can be important during alfalfa establishment as weeds can reduce stand life, alfalfa biomass, and forage quality. To reduce these impacts producers commonly apply herbicides to establishing alfalfa. A range of options exist, but the most common applications include […]
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