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Experimental plots measuring 6 rows × 655 ft were planted at Rich-a-Lu farm in East Aurora, N.Y. on 2 May with a 2-row corn planter at 31,000/acre, and fertilized with 400 lb of 10-10-10 fertilizer banded at planting. Soils were silt loam. Adult beetle counts averaged between 4 and 6 beetles/plant during the 1989 oviposition period in this field. Three treatments of: 8 oz/1000 Lorsban ft, 4 oz/1000 Lorsban ft, and an untreated check, were used. Each treatment was 2 rows × 655 ft long. The 3 treatments were replicated 4 times in a complete randomized block design. Supplimental nitrogen was provided with a preplant incorporated application of ton manure/ acre. Granular insecticides were applied at planting with Noble granular applicators mounted on the planter. Five plants in each row (10 plants per treatment per block) were dug and the roots washed prior to rating root damage using the Iowa 1-6 rating scale on 2 Aug. Treatments were mechanically harvested on 24 Sep with a single row silage chopper (New Holland model 707), and the silage from each treatment row was collected and weighed in a weigh wagon.

Experimental plots measuring 7.3 × 7.3 m (24 × 24 ft) were established in a 4-yr-old field of‘Oneida VR’ alfalfa in Ithaca, NY. Soils were silt loam. Eighteen treatments were replicated 3 times in a complete randomized block design. The field was sampled for the number of alfalfa weevil larvae/25 stems on 1 Jun before any insecticide applications. Insecticides were applied the same day with a C02 sprayer calibrated at 283.9 liter/ha (30 gal/acre) mounted on an ATV travelling at 5.64 km/h (3.5 mph) with a 3.66 m (12 ft) boom. Fields were resampled 4 and 7 DAT.