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EFFICACY AND PHYTOTOXICITY OF INSECTICIDES TANK-MIXED WITH EXPRESS HERBICIDE AND TOPDRESS NITROGEN FOR BARLEY YELLOW DWARF SUPPRESSION ON WHEAT, 1997: We tested selected insecticide x herbicide x nitrogen tank-mixes because growers often wish to reduce costs by combining aphid control applications with other field operations. Tests were conducted at the Edisto REC in Barnwell County, SC from Jan to May 1997. The experimental design was a RCB with four replicates. The experimental unit was 30 ft x 5.3 ft (8 rows on 8-inch spacing). Treatments were applied to tillering wheat (Zadocks GS 23) on 31 Jan with a tractor-mounted, three-point-hitch shielded CO2 sprayer delivering 23 gpa of S-25 nitrogen at 30 psi through Tee Jet 11003 flat fan nozzles. The carrier for all treatments was S-25 nitrogen (23 gpa = 61 lb N/acre). One-half of the treatments also had Express 75 DF herbicide at the recommended rate of 0.016 lb (AI)/acre mixed with tested insecticides as shown in the table below. Phytotoxicity ratings were taken 4 DAT by having two observers scan each plot and assign a relative score of 0-3, with 0 = no observed chlorosis; 3 = chlorosis and necrosis on all older, prostrate leaves and chlorosis on upper leaves. Daily high temperatures over the 4-d period ranged from 21-23°C with bright sunshine. Barley yellow dwarf virus (BYDV) ratings were taken on 10 Apr (Zadocks GS 70) by two observers, each scanning two interior rows for the full length of each plot. Counts were taken of the total number of symptomatic stems in the scanned row lengths (200 row ft/plot). Aphid counts were not taken in the treatments, but counts in the untreated check showed that BCOA exceeded 15/row ft in Feb. BCOA is the primary BYDV vector in South Carolina. The middle 6 rows of each plot were harvested for yield with an Almaco plot combine. Test weight was taken by funneling a subsample through a Seedburo No. 151 filling hopper and weighing a 1-pint volume on an electronic scale. Grain moisture was measured with a Burrows DMC-700 moisture meter and all yields were adjusted to 13.5% prior to analysis. Data were subjected to ANOVA (SAS, PROC GLM) using a protected LSD test (P = 0.05) for means separation.