Abstract
In 2012, the Washington raspberry (Rubus idaeus) industry received a special local needs (SLN) 24(c) label to apply Vydate L® (active ingredient oxamyl) to nonbearing raspberry for the management of Pratylenchus penetrans. This is a new use pattern of this nematicide for raspberry growers; therefore, research was conducted to identify the optimum spring application timing of oxamyl for the suppression of P. penetrans. Three on-farm trials in each of 2012 and 2013 were established in Washington in newly planted raspberry trials on a range of varieties. Oxamyl was applied twice in April (2013 only), May, and June, and these treatments were compared to each other as well as a nontreated control. Population densities of P. penetrans were determined in the fall and spring postoxamyl applications for at least 1.5 years. Plant vigor was also evaluated in the trials. Combined results from 2012 and 2013 trials indicated that application timing in the spring was not critical. Oxamyl application reduced root P. penetrans population densities in all six trials. Reductions in P. penetrans population densities in roots of oxamyl-treated plants, regardless of application timing, ranged from 62% to 99% of densities in nontreated controls. Phytotoxicity to newly planted raspberry was never observed in any of the trials. A nonbearing application of oxamyl is an important addition to current control methods used to manage P. penetrans in raspberry in Washington.
Highlights
In 2012, the Washington raspberry (Rubus idaeus) industry received a special local needs (SLN) 24(c) label to apply Vydate LÒ to nonbearing raspberry for the management of Pratylenchus penetrans
We demonstrated that a spring application of oxamyl to bearing raspberry plants reduced P. penetrans population densities for up to 2 years, but fall oxamyl applications were not effective (Walters et al, 2009)
The May application timing of oxamyl resulted in 43% lower densities of P. penetrans in soil compared with the nontreated control (Table 3)
Summary
In 2012, the Washington raspberry (Rubus idaeus) industry received a special local needs (SLN) 24(c) label to apply Vydate LÒ (active ingredient oxamyl) to nonbearing raspberry for the management of Pratylenchus penetrans. This is a new use pattern of this nematicide for raspberry growers; research was conducted to identify the optimum spring application timing of oxamyl for the suppression of P. penetrans. Washington raspberry growers can only apply oxamyl in the spring soon after planting, additional guidelines in best application methods for this nematicide are needed. To help growers utilize this important postplant management option, the objective of this research was to investigate application timing of oxyaml to nonbearing raspberry for the suppression of P. penetrans
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