Abstract
Abstract The efficacy of selected insecticide treatments was evaluated against the RIFA in grain sorghum. The experiment was conducted at the Macon Ridge location of the Northeast Research Station near Winnsboro, LA. Grain sorghum was planted no-till with a John Deere 7300 planter into a bermuda-grass and containing a high density of RIFA mounds. The test was planted on 30 May in a RCB design with 4-row plots (40-inch centers) X 15 ft and 4 replications. Karate 1 EC and Furadan 4°F were applied as in-furrow sprays at planting (IFSAP) using a CO2 charged system calibrated to deliver 5 gpa of total solution at 35 psi through 8002E flat fan nozzles (1/row). Lorsban 4 EC was applied as pre-emergence surface spray (PRE) immediately post-plant with a CO2 charged system calibrated to deliver 10 gpa at 35 psi through 8001 flat fan nozzles (1/row) in a band 20 inches wide over the row center. Other treatments were applied either as T-banded granules at planting (TBAND) or seed treatments (SEEDT). RIFA densities were estimated on 18 Jun by placing an unruled index card (3 X 5 inches) baited with a teaspoon of creamy peanut butter evenly distributed on one side of the card. One card was placed, baited side down, in each plot and the number of ants attracted after 30 minutes was recorded. Plant population densities were recorded on 2 Jul by sampling the entire 2 center rows. The heights of 20 randomly selected plants from the 2 center rows of each plot were measured on 3 Jul. Intra-row skips between plants were recorded on 3 Jul by counting the number of skips between plants > 12 inches in the 2 center rows. RIFA density data were transformed [log (x + 1)] prior to ANOVA and LSD. Actual means were presented in table.
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