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in leaf anatomical structure ( Ojeda-Barrios et al., 2012 ). Pecan orchards affected by Zn deficiency are usually established in soils with low organic matter such as the alkaline, calcareous soils found in the southwestern United States and northern

The Agave is an important species native to semiarid and arid regions, the origin center being Mexico. These plant populations spread from the southwestern United States through Central America, the Caribbean, and into northern South America

postcard displaying the fruits on a field of spineless cacti. The use of prickly pear as a forage crop began with the introduction of cattle to the New World by the Spanish to their territories in Mexico and the southwestern United States where Opuntia

southwestern United States ( Whitaker, 1974 ). The second cycle resulted in ‘Great Lakes’ type varieties primarily from recombination of ‘Imperial’ type cultivars with ‘Brittle Ice’. ‘Great Lakes’ cultivars were stress-tolerant, resistant to the physiological

United States. In these alkaline soils, Zn binds with hydroxyls and carbonates to form low-solubility compounds, making it less available to plants ( Udo et al., 1970 ). Lack of Zn availability frequently leads to Zn deficiency in desert-grown pecans

, but have not been pursued for verticillium wilt ( Simko et al., 2014 ). The majority of U.S. iceberg lettuce is produced year round in the southwestern United States. In Coastal California, lettuce is harvested from April to October. Later in the year

perennials grown in the landscape in the arid and semiarid southwestern United States ( Niu and Rodriguez, 2006 ). To our knowledge, the last significant screening of herbaceous annuals (bedding plants) took place over two decades ago ( Tija and Rose, 1987

’ fields, disease incidence is lower in the southwestern United States because of decreased rainfall and humidity. Factors other than transport of diseased plant materials that may account for the observed lack of significant clustering include sexual

573 Greene, E.L. 1906 The genus Ptelea in the western and southwestern United States and Mexico Contr. U.S. Nat. Herb. 10 49 78 Keeley, J.E. 1979 Population differentiation along a flood frequency gradient: Physiological adaptations to flooding in

good, chlorophyll indices from these trees may be considered to represent acceptable readings for established ‘Wichita’ pecan trees in the irrigated southwestern United States. In several other crops, a SPAD index reading of 50 to 52 represented