• Comparisons of Lorsban 4E and Spinosad 4SC for Control of Summer Insects in Alfalfa

      Rethwisch, Michael D.; Kruse, Elizabeth; Kruse, Michael D.; Ottman, Michael (College of Agriculture, University of Arizona (Tucson, AZ), 1997-10)
      Anew chemistry (Spinosad 4SC) was tested for control of beet armyworm and other summers insects in alfalfa. This product did not control beet armyworms as well as the top of label rate of Lorsban 4E, and at one day post treatment had more beet armyworms than the lowest rate of Lorsban tested At three days post treatment both rates of Spinosad 4SC had fewer beet armyworms than the lowest rate of Lorsban tested. Few differences were noted between Spinosad 4SC for beet armyworm control, although fewer alfalfa caterpillars were noted with usage of the higher Spinosad rate, although significantly more beneficial insects were noted at three days post treatment with the lower rate of Spinosad. Lorsban chemistries significantly lowered yellows and hopperburn damage ratings compared with other treatments and a difference was noted between the two Spinosad rates although Empoasca sp. leafhopper numbers were similar.
    • Effect of Soil Sunburst on Yield and Quality of First Year Alfalfa

      Rethwisch, Michael D.; Kruse, Michael D.; Ottman, Michael (College of Agriculture, University of Arizona (Tucson, AZ), 1997-10)
      Soil Sunburst was applied at the rate of one quart per acre at two treatment levels (single vs. two applications, applied once per cutting) in irrigation water to a first year stand of CUF 101 alfalfa. Treatments were applied in the first irrigation after the previous cutting in May and June 1996. Treatments applied in May increased relative feed value by over 10% compared to the untreated check in the first cutting (June) after application. This increased alfalfa quality rating from fair to good which increased value of hay by approximately $14 /acre. Mean yields between the treatments and untreated plots were similar, although average yields in untreated plots were 50-90 lbs /acre greater than in treated plots. Yields and quality data were not able to be obtained the second harvest (July), not allowing differences, if any, between one and two applications to be determined immediately after the second application. Yields and hay quality values for treatments in the August harvest were almost identical, indicating that treatment effects noted from the May application (and possibly those of the June application) were short term effects, as they did not continue through the August cutting.