Abstract
Abstract On 29 Apr, flue-cured tobacco was planted at the Central Crops Research Station, Clayton, NC, in a field with a mix of Fuquay loamy sand and Norfolk loamy sand. Plots were 1 row (45 inches apart) wide by 25 plants (ca. 55 ft) long and were arranged in a randomized-complete block design with 6 treatments and 4 blocks, separated by an untreated buffer row. Within each plot, 1 leaf in the upper 1/3 of the plant with from 50-100 tobacco aphids was selected from 10 plants and tagged with fluorescent surveying tape. All aphids on these leaves were counted and recorded on 25 Jun to obtain a pretreatment count. Treatments were applied on 27 Jun with a CO2-pressurized spraying system mounted on a John Deere Hi-Cycle 600 sprayer. Sprays were applied through a single Spraying Systems D2-33 full-cone nozzle per row at 60 lb psi and 25 gals/acre. Four, 11, and 18 DAT, the number of surviving tobacco aphids on the tagged leaves was counted and all plants in the plot were rated for aphid abundance (0-7). Using this count data, the percent control was calculated using Abbott's formula. Before ANOVA, percent control was transformed to arcsine percent/100. Waller-Duncan K-ratio t tests (K = 100) were used to separate treatment means. Means of untransformed data are reported.
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