Spring Management of White Grubs in Chesterfield, In, 1993

Treatment plots were 6 ft × 2 ft, arranged in a RCB design, replicated 5 times. Treatments were applied 7 May. Triumph and Dursban were applied with a COypressurized backpack sprayer using 11003 nozzles, operating at 20 psi and delivering 20 gal/acre. Granular formulations were applied using a homemade salt shaker. All plots were irrigated with 0.25 inches of water immediately after treatment. Conditions at the time of treatment were: air temp., 27°C; thatch depth (natural), 0.5-0.75 inches; soil texture, silt loam; soil pH 5.6; wind speed 2-8 mph. Efficacy was evaluated 21 May using a sod cutter that excised the turf to a depth of 0.75 inches. The sod (6 ft × 1.5 ft) cut by the sod cutter was turned over and the number of grubs clinging to the grass roots and exposed on the ground was recorded.