Abstract
Abstract ‘Danvers 126’ carrots were direct-seeded into 2 row beds on 40-in centers on 11 Nov at the Tex. Agric. Exp. Sta., Weslaco, TX. The experimental design was a randomized complete block with 5 replicates. Treatments consisted of early, late and entire season applications of methyl-parathion and Pydrin and untreated controls. Early and continuous season spray regimes were initiated 4 Dec. Early season treatments were terminated 12 Feb. Late season treatments were initiated 26 Feb and continued along with entire season treatments until 6 May. Applications were made at approximately 2 week intervals using a back-pack mounted sprayer operated at 40 psi, 2 mph with nozzles 10 inches above the leaf canopy delivering 10 gal/acre. Plots were sampled prior to treatment and at 8, 16 and 24 weeks post initial applications. Ten randomly selected carrots from each plot were examined for feeding damage to roots and presence of eggs and larvae in the roots and foliage. Data was analysed using covariance analysis with pre-treatment data serving as plot covariants and mean separations determined using the SAS procedure PDIFF and DNMRT.
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