White Grub Control in Field Corn, 1981

‘Northrup King PX79’ field corn was sod-planted on May 15, on the VPISSU Agronomy Farm, Montgomery Co, VA. The land had been in sod for several years. At the time of planting the water content of the soil was 26.25% and the pH was 6.3. A tank-mix of Paraquat, Atrazine, and Dual was applied prior to planting. Three rates of BAS 263 11 I (3.6, 2.4, 1.2 oz ai/1000 ft) were applied on May 18 with a Gandy granular applicator using a 7-in band at the height of 5 in. Treatments were replicated 4 times on completely randomized plots measuring 12 ft x 5(1 ft (each plot was 4 rows wide - 36 in rows). White grub populations were estimated before planting by taking 4-in core samples over the entire treat area. The grub population averaged 12 grubs per 4-in core. Control was evaluated on Jul 23. Ten cores (4 in), consisting of 1 corn root system and the associated soil, were taken from each plot (40 cores per treatment) to determine the average number of white grubs per core.