Education Commons^™

G89-926 Swine Reproductive Problems: Infectious Causes, Alex Hogg, Donald G. Levis

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide describes causes, clinical signs, control, prevention and treatment of swine reproductive problems due to infectious diseases. The reproductive potential for the ideal sow has been calculated as 31.2 pigs weaned per year. The United States average is 14 pigs per sow per year--less than one-half the reproductive potential of the ideal sow. A major part of this low reproductive efficiency is due to either infectious or non-infectious causes. The infectious causes of swine reproductive problems are addressed here.

G89-936 Russian Wheat Aphid, Gary L. Hein, Frederick P. Baxendale, John B. Campbell, Arthur F. Hagen, James A. Kalisch

University of Nebraska-Lincoln Extension: Historical Materials

The Russian wheat aphid is a serious insect threat to small grains. Its description, damage and control are discussed here.

The Russian wheat aphid (RWA) is a serious insect threat to wheat and other small grains. Growers should examine small grain fields regularly for this pest throughout the fall. In the spring, weekly examinations are needed from the time wheat resumes growth through the late heading stages.

Farmers are encouraged to collect samples of unknown aphids on small grains and have them identified by the Cooperative Extension Service. Proper identification of the aphid is critical in determining the need for …

G89-900 Phytophthora Root Rot Of Alfalfa, John E. Watkins, Fred A. Gray, Bruce Anderson

University of Nebraska-Lincoln Extension: Historical Materials

Disease cycle, symptoms and management practices for phytophthora root rot are discussed in this NebGuide.

Phytophthora root rot (PRR) is a major cause of seedling death in newly established alfalfa, and causes a progressive decline of established stands in Nebraska. This disease is caused by the fungus Phytophthora megasperma f. sp. medicaginis and occurs in most of the alfalfa producing areas in North America.

The Phytophthora that infects alfalfa is different from the Phytophthora that causes root rot in soybeans. Growers sometimes think the two diseases are the same for the respective crops, but they are two different diseases with …

G89-906 Barley Yellow Dwarf Disease Of Barley, Oats, And Wheat, John E. Watkins, Leslie C. Lane

University of Nebraska-Lincoln Extension: Historical Materials

The symptoms of barley yellow dwarf are covered here, as are disease occurrence and spread, and control.

Barley yellow dwarf (BYD) is distributed worldwide. It is the most economically important disease of barley and oats in North America. Barley yellow dwarf, wheat streak mosaic (WSM) and soil-borne wheat mosaic (SBWM), are three virus diseases that caused serious cereal grain yield losses in Nebraska during the last decade.

Since the mid-1980s barley yellow dwarf has become increasingly widespread in Nebraska, and now is a serious concern to oat and wheat producers. Outbreaks occasionally reach epidemic proportions as occurred in wheat in …