Podworm, Soybean Looper, and Green Cloverworm Control on Soybeans with Synthetic Pyrethroids and Baciilus Thuringiensis, 1981

Abstract

Abstract Test 1 A field trial was initiated on Aug 26 at the Plant Breeding Unit of Auburn University near Tallassee, AL following the discovery of a substantial population of target pest species. One hundredth acre plots were utilized (36 ft by 4 rows wide, with 40 inch row spacing) and were treated with materials applied with a CO2-powered knapsack sprayer, calibrated to deliver 22 gal/acre at 27 psi using three D2-25 disc core type hollow cone spray Tips per row. A randomized complete block design with 4 replications was used. Pre-spray larval counts were taken 1 day prior to treatment, and evaluations made at 1 and 4 days post-spray. All samples were taken by the shake cloth method, one 6 ft sample/plot, and returned to the laboratory for assessment and tabulation. Test 2 A 2nd field trial was initiated adjacent to Test 1 on Sep 1. One-third acre (ca) plots (10 rows x 368 ft) were treated using a John Deere high clearance sprayer calibrated to deliver 10 gal/a with 3 TX8 nozzles/row, operating at 60 psi and 2 mph. A randomized complete block design with 4 replications was used. Pre-spray larval counts were taken on Aug 31, and post-spray evaluations were made on Sep 8 and 14. Larval populations were estimated by taking one 3-ft shake cloth sample/plot.