Evaluation of Soil Insecticides on Continuous Corn in Ohio, 1995

Soil insecticides were evaluated for stand protection and rootworm control at the OARDC Western Branch Field Station near South Charleston. The test included 19 treatments compared to an untreated check treatment on reduced tillage plots that were 18.2 m (60 ft) in length and 2 rows wide for granular treatments and 4 rows wide for liquid treatments. Row spacing was 76.2 cm (30 inches). A RCBD was applied with 4 replicates. Planting time granular applications were applied as a band prior to closure by the press wheel or in-furrow using a 2 row John Deere 7000 planter equipped with Noble granular applicators. Post-emergence applications of liquid formulations were applied as a banded or broadcasted treatment with a boom sprayer equipped with flat spray nozzles and calibrated to deliver desired dosages at 3 mph. Granular treatments were applied 22 May at planting, and post-emergence treatments were applied 5 Jun to coincide with rootworm hatch. Treatments were evaluated 14 Jun for stand loss with counts of the total and injured plants per 15.1 m (50 ft) of row when corn was predominantly at the 4th or 5th leaf stage. Root ratings were conducted 5 Jul on 5 plants per plot using the Iowa 1-6 scale. Grain yields were determined by machine harvest of total plots on 12 Oct.