• Evaluation of AuxiGro® WP and Foliar Fertilizers on Bermudagrass Seed Production

      Rethwisch, Michael D.; Reay, Mark; Grudovich, Jessica; Ramos, D. Michael; Wellman, Jessica; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2005-12)
      AuxiGro® WP was evaluated for effects on bermudagrass seed production in the Palo Verde Valley of far eastern California. Four rates of this product, in addition to a 4 oz./acre rate with two fertilizers were tested, as were the fertilizers only to separate treatment effects. Highest yields from subplot harvests were noted from the 2 and 4 oz./acre rates of AuxiGro® WP, and germination percentages from these treatments and resultant pure live seed were also numerically higher (81-99 lbs./acre) than that noted from untreated bermudagrass, although most plant parameters did not result in statistical difference.
    • Evaluation of Herbicides for the Control of Littleseed Canarygrass in Wheat – 2005

      Tickes, Barry; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2005-12)
      Three herbicides, Puma, Achieve and Osprey, have been registered for the control of Littleseed Canarygrass in the last five years. Another, Pinoxaden, is being developed and should be registered in the next few years. These herbicides were compared for weed control and crop safety. All produced very good to excellent levels of control although crop injury, especially when tank mixed with broadleaf herbicides, was significant.
    • Evaluation of Two Velpar® Formulations on Alfalfa, 2005

      Rethwisch, Michael D.; Tickes, Barry R.; Luna, Manuel; Dulmage, Alexandra; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2005-12)
      Two formulations of Velpar® (DF, L) were evaluated over multiple alfalfa varieties to compare the potential phytotoxic effects this product. Treatments were made April 15, with yield and stem data collected on May 10. Both Velpar® formulations resulted in yellowed alfalfa within three days of application, with symptoms disappearing by 21 days post treatment. Yield data indicated increased yields from alfalfa treated with Velpar®, due to increased numbers of stems. The reason for the stem increase associated with Velpar® usage is unknown.
    • Evaluation of Various Insecticides for Late Winter/Early Spring Insect Control, 2004

      Rethwisch, Michael D.; Grudovich, Jessica; Bennett, Steven; Reay, Mark; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2005-12)
      Nine insecticides were applied on March 10, 2004, to alfalfa that had been water stressed prior to irrigation on March 6. These actions were thought to have resulted in treatments means with less distinct differences than usually noted for these treatments at 7-14 days post treatment. All pyrethroid treatments as well as Lorsban® and Steward® treatments resulted in significant reductions of alfalfa weevil larvae at four days post treatment. The Trilogy® treatment did not result in acceptable control of this pest. Significant increases in adult alfalfa weevils were noted at 10-14 days post treatment in pyrethroid treated alfalfa, perhaps due to increased production of certain plant volatiles in response to this class of insecticides. Low numbers of blue alfalfa aphids were noted in this study partially due to insecticide control as well as numerous beneficial insects. Fewest damsel bugs were noted from alfalfa treated with MustangMAXTM and Warrior® insecticides.
    • Small Grains Variety Evaluation at Arizona City, Coolidge, Maricopa, and Yuma, 2005

      Ottman, Michael J.; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2005-12)
      Small grain varieties are evaluated each year by University of Arizona personnel. The purpose of these tests is to characterize varieties in terms of yield and other attributes. Variety performance varies greatly from year to year and several site-years are necessary to adequately characterize the yield potential of a variety. A summary of small grain variety trials conducted by the University of Arizona can be found online at http://ag.arizona.edu/pubs/crops/az1265.pdf.
    • Swather Applied Trilogy® Effects on Twospotted Spider Mite Populations and Resultant Alfalfa Yields and Quality

      Rethwisch, Michael D.; Luna, Manuel; Williams, Michael; Saenz, Amanda; Reay, Mark; Grudovich, Jessica; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2005-12)
      Trilogy® was applied via swather at cutting in April to alfalfa infested with twospotted spider mites. Data from samples obtained at 12 days after application noted somewhat reduced spider populations as a result of Trilogy® application, although new growth was thought to be re-infested from previously cut alfalfa which was in contact with new growth. Western flower thrips later became very prominent in plots and resulted in greatly reduced spider mite populations. Trilogy® treatment resulted in increased yields thought due to larger stem diameters as a result of fewer spider mites early in study. Very slight increases were also noted for alfalfa quality parameters as a result of Trilogy® application. Economic analysis indicated that Trilogy® applied via swather in this experiment resulted in a net increase in alfalfa valued at $2.12/acre.