Early Season Control of the Southern Corn Rootworm in Field Corn with Granular Soil Insecticides, 1983

Abstract

Abstract Ten granular soil insecticides registered for control of larvae of the southern corn rootworm were evaluated at two rates in Louisiana. Pioneer Brand 3369-A field corn was used in the test. The corn was planted 18 Mar. at the farm of a grower/cooperator near Sunset, La., in Saint Landry parish. Insecticides were applied using a 2-row John Deere Model 71 Flexi-Planter, modified to carry pint jars of insecticide. The jars were inverted above funnels connected by flexible delivery tubes to either a 7 in band or in-furrow applicator to obtain the desired placement of insecticide. The diameter of a single central hole in the lid of each jar determined the rate of insecticide flow. Banded insecticides, other than Mocap, were applied ahead of the press wheel and were further incorporated by the drag chain. Corn seeds were planted in a conventional manner at the same time as insecticide application. A completely randomized block design was used with four replications. Each treatment consisted of two 50-ft rows spaced 36 in. apart. Twenty-foot alleys separated each replication. Treatments were evaluated by counting dead and dying and undamaged plants in 50 ft of row. Evaluation was done on 26 Apr., 34 days postplanting. The soil type at the test site is a silt loam soil with fair drainage.