ENHANCING NITROGEN USE EFFICIENCY OF POTATO AND CEREAL CROPS BY OPTIMIZING TEMPERATURE, MOISTURE, BALANCED NUTRIENTS AND OXYGEN BIOAVAILABILITY Guodong Liu a , Yuncong Li a , Ashok K. Alva b , David M. Porterfield c & James Dunlop d a Horticultural Sciences Department, University of Florida, Gainesville, Florida, USA b Vegetable and Forage Crops Research Laboratory, USDA-ARS, Prosser, Washingto...

Ioannis E. Tzanetakis and Anne B. Halgren, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331; Karen E. Keller, Horticulture Crops Research Lab, USDA-ARS, Corvallis 97330; Stanley C. Hokanson, Department of Horticultural Science, University of Minnesota, St. Paul 55108; John L. Maas, USDAARS Fruit Lab, Beltsville 20705; Paul L. McCarthy and Robert R. Martin, Hort...

Badnaviruses (Family: Caulimoviridae; Genus: Badnavirus) are non-enveloped bacilliform DNA viruses with a monopartite genome containing about 7.2 to 9.2 kb of dsDNA with three to seven open reading frames. They are transmitted by mealybugs and a few species by aphids in a semi-persistent manner. They are one of the most important plant virus groups and have emerged as serious pathogens affectin...

The twospotted spider mite, Tetranychus urticae Koch, is a worldwide pest of numerous agronomic and horticultural plants. Sulfur fungicides are known to induce outbreaks of this pest on several crops, although mechanisms associated with sulfur-induced mite outbreaks are largely unknown. Studies were conducted during 2007-2009 in Oregon and Washington hop yards to evaluate the effect of timing ...

Pythium species are morphologically polymorphic, physiologically unique and ecologically versatile, which make them significant both theoretically and practically. They are ubiquitous in soil and in water, distributed worldwide, and with very diverse host ranges. They include some of the most important and destructive plant pathogens, causing losses of seeds, pre-emergence and post-emergence da...