Abstract
Abstract Experimental plots measuring 42 rows × 100 ft were planted at Rich-a-Lu farm in East Aurora, N.Y., on 19 May with a 2-row corn planter at 31,000 seeds/acre, and fertilized with 400 lb of 10-10-10 fertilizer banded at planting. Soils were silt loam with 4% organic matter. Adult beetle counts averaged between 4 and 6 beetles/plant during the 1988 oviposition period in this field. Each treatment was 1 row by 100 ft. Fourty-two treatments were replicated 4 times in a complete randomized block design. Supplemental nitrogen was provided with a preplant incorporated application of 40 ton manure/acre. Granular insecticides were applied at planting with Noble granular applicators mounted on the planter. Stand counts were taken on 50 ft of row on 9 Jun. Five plants in each row were dug and the roots washed before rating root damage using the Iowa 1-6 root rating scale on 26 Jul.
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