Abstract
Abstract Onions were direct seeded on 1 May at a site in Ingham County, MI. Plots were 20 ft long double rows with 16 inch spacing between double rows. Treatments were arranged in a randomized complete block design (four replications per treatment) with one unsprayed buffer row between each treatment row. Foliar treatments were applied with a hand-held CO2 sprayer with a single flat fan nozzle (TEEJET 8002VS) at 45 psi and 60 gal/acre. The NTN sidedress treatment was applied 9 Jul in a 1 inch furrow, 3 inches from the base of the plants, then covered with soil. The NTN foliar and the NTN foliar plus spreader treatments were first applied on 24 Jul; all foliar treatments (including NTN) were applied on 4, 11, and 18 Aug. Plots untreated as of 4 Aug (i.e. all but the NTN treatments) were sampled for thrips. Ten consecutive plants/replication were randomly selected and the thrips rinsed off the plants with approximately 250 ml of 75% ethanol. Thrips were filtered out of the ethanol and counted. On 6 and 20 Aug all treatments were sampled for thrips as described above.
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