Author
Pinkerton, John | |
Martin, Robert |
Submitted to: Proceedings of Methyl Bromide Alternatives Conference
Publication Type: Proceedings Publication Acceptance Date: 11/20/2002 Publication Date: 11/20/2002 Citation: J. Pinkerton USDA ARS, R. Martin USDA ARS, Management of tomato ringspot virus in red raspberry with crop rotation. Proceeding of Methyl Bromide Alternatives Conference. November 2002 Interpretive Summary: Technical Abstract: Tomato ringspot virus (ToRSV) is a problem in red raspberry production in the Pacific Northwest. Vigor declines after plants become infected with ToRSV and plants often die in 4-5 years. The objective of this research was to evaluate rotational crops for the management of ToRSV as an alternative to soil fumigation. In fall 1998, plots were established in a raspberry field with plants symptomatic of ToRSV infection. The effects of treatments on nematode population densities and ToRSV were evaluated during 18 months while treatments were made and for 36 months after replanting raspberries. Treatments were the rotational crops Brassica napus and Festuca arundinacea (non-hosts for ToRSV), clean fallow, fumigation with methyl bromide, and controls that remained in raspberry. Experimental design was a randomized block with 5 replicates. Rotation crops were seeded on 22 October 1998. On 15 November 1999, methyl bromide 99.5% at 100 g m2 was applied under a polyethylene film. Crops were incorporated and all plots were tilled in May 2000. On 6 June 2000, ten 'Meeker' raspberry plants were planted in each plots. At planting X. americanum densities were highest in grass and control plots and lowest in fumigated plots. After planting, nematode densities decreased and remained low through 2003. Raspberry leaves were collected in each plot and assayed for ToRSV with ELISA from October 2000 through July 2003. As of July 2003, ToRSV was detected only in leaves collected in the control plots. Rotations with non-host of ToRSV and weed-free fallow were as effective as fumigation with methyl bromide in preventing reinfection of raspberry plants with ToRSV for up to three years. |