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United States Department of Agriculture

Agricultural Research Service


Location: Horticultural Crops Research

2007 Annual Report

1a.Objectives (from AD-416)
Evaluate the efficacy of post-plant applications of synthetic and biological nematicides as replacement for Fenamiphos (Nemacur).

1b.Approach (from AD-416)
A field experiment will be established in Lynden, WA. Soil samples will be collected from various established red raspberry fields in the fall as the dagger nematode and the lesion nematode densities are high during fall. A field with moderate to high nematode densities will be used for our experimental trials. The experiment will be laid out in 5 adjacent rows. Plots will consist of 10 m of row in a randomized block experimental design with five replicates. Documents SCA with Washington State University.

3.Progress Report
This report serves to document research conducted under a specific cooperative agreement between ARS and Washington State University. Additional details of research can be found in the report for the parent project 5358-12220-003-00D, Biology and Management of Soilborne Diseases of Horticultural Crops.

Dr. Riga and collaborators conducted the following research towards the agreements objectives:

Field trial: Treatments were applied in 27’ long plots in a ‘Nootka’ red raspberry field (Mr. Ehlers, Lynden, WA): Phenamiphos (Nemacur); Cordon; Vydate; DiTera; and Fosthiazate. Nontreated plots were served as controls. Treatments were applied in the greenhouse (E. Riga, WSU-IAREC): Greenhouse experiment: Brassica carinata (mustard meal) at 0.5% and 1.0% w/w was mixed in potting soil prior to planting; and STO-007 at 1 ounce and STO-008 at 2 ounces per acre applied every two weeks to raspberry plants in 1-gallon pots. Nontreated plants served as controls. Lesion Nematode Results from Greenhouse Trials: In the two greenhouse trials, Brassica carinata mustard meal and STO were used against nematodes, as follows: there was a significant difference between nontreated controls, 56 nematodes per 250 cc soil, and 1% B. carinata treated red raspberries, 13.5 nematodes per 250 cc soil, respectively (P= 0.03); there was no significant difference between nematode densities in the nontreated controls and the plants treated with STO products.

Summary: Vydate and Fosthiazate significantly suppressed root lesion nematodes in the roots and soil; Nemacur was intermediate, while Cordon and DiTera were not effective. There is no significant difference between the fruit weight of the control and the treatments, except Vydate, which reduced fruit yield. Plants treated with Vydate twice in spring 2006 at a rate of 1 gal/A in the row showed phytotoxic symptoms; applications at lower rates were made in spring 2007. The effects of treatments applied in 2006 on growth and yield will be evaluated in 2007 without additional applications.

ADODR Statement: The ADODR met with the cooperating PI and project personnel at meetings during the year and discussed results through phone calls, e-mail, and in person.

Last Modified: 9/10/2014
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