Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 4/30/2011
Publication Date: N/A
Citation: N/A Interpretive Summary:
Technical Abstract: Red raspberries (Rubus ideaus) are a major crop in the Pacific Northwest of the United States, with this region producing over 90% of the nation’s processed raspberries. Pratylenchus penetrans is commonly found in raspberry plantings and has been shown to reduce raspberry vigor and yield. Currently, there are no effective post-plant nematicides labeled for use in raspberries to control this plant-parasitic nematode. To identify a post-plant nematicide to control P. penetrans in raspberry, several commercially-available nematicides were tested in greenhouse and field trials. Promax and NemaQ were tested in both experimental venues, while Movento and Cordon were tested in the field trial only. Nemacur was included in the field trial as the industry standard, which is no longer registered for use on raspberry, and Vydate, which is labeled on raspberry in Canada but not in the United States, was included in the greenhouse trials. In all trials, a nontreated control was included; in the greenhouse trials a noninoculated, nontreated control was also included. All treatments were replicated 6 to 8 times and appropriately randomized and blocked. In the greenhouse trials, one-month-old raspberries 'Meeker' were inoculated with 3,000 P. penetrans. One month later nematicides were applied as soil drenches, and NemaQ and Promax were applied four times at three-week intervals. Plants were destructively sampled after three months. Only Vydate reduced the number of P. penetrans/50 g soil and /g root compared to the nontreated control. None of the nematicides were phytotoxic with shoot and root weights similar to the noninoculated, nontreated control. The field trial was conducted in an established raspberry 'Meeker' planting. There was no effect of nematicides on raspberry yield. At the rates and timings used here, none of the tested nematicides (except for Vydate) reduced P. penetrans population densities or enhanced raspberry growth or productivity.