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Control of Germinating Seed Pests on Field Corn, 1990


 An experiment was conducted on 23 Apr in Northumberland County, Va., to determine the effectiveness of several granular insecticides and a seed treatment against pests of germinating corn seeds. The recent cropping history for this field included field corn planted in 1988 and 1989 followed by a cover crop of crimson clover each yr. Soil type for this field is characterized as a Suffolk fine sandy loam. The experimental design involved a randomized complete block experiment with 4 replications. Each plot consisted of a single, 15- ft row in which furrows were hand dug to a uniform depth of approximately 1.5 inches. Seeds were spaced 6 inches apart within the furrows providing about 30 seeds per plot. Each block was separated from adjacent blocks by a distance of 6.3 ft. All granular insecticides were applied in-furrow using pint canning jars (Mason) with lids in which a single opening had been drilled. Lid openings were laboratory-calibrated to deliver accurately the labeled rate for each insecticide while walking at 3 mph. The possibility of mixing one or more insecticides was avoided by using a separate jar and lid for each treatment. For the treatments involving Agrox D-L Plus, the rates of 1- and 2-oz product/bushel of corn seed were used. In addition to recording whole-plot stand counts on 7 May, the roots and attached seed for each corn seedling, as well as seeds which had not germinated, were removed from the soil and inspected for evidence of feeding damage. Back transformed percentages are presented in the table.