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Effectiveness of Nontarped Broadcast Fumigation and Root Removal on Root Lesion Nematode and Fusarium and Pythium Species in a Red Raspberry System

L. W. DeVetter, S. Watkinson, I. A. Zasada, J. E. Weiland, C. Hesse, and T. W. Walters

June 2018

Research

Improved methods for the management of soil-borne pathogens are needed in the raspberry production system in the Pacific Northwest. A multiyear experiment was conducted in a commercial raspberry field in northwest Washington with the following objectives: (i) to determine if the standard industry fumigation treatment of nontarped broadcast application of 1,3-dichloropropene/chloropicrin (Telone C-35) is effective against Pratylenchus penetrans and Pythium and Fusarium species; (ii) to determine if root removal prior to nontarped broadcast fumigation with Telone C-35 improves management of P. penetrans and Fusarium and Pythium species; and (iii) to identify microbes that have the potential to be soil-borne pathogens through microbial community analysis. Fumigation alone briefly reduced population densities of P. penetrans but was ineffective at reducing existing, pretreatment populations of Fusarium and Pythium. However, populations of these two genera were lower in fumigated than in nonfumigated plots for at least 6 months after fumigation. Root removal did not enhance fumigant efficacy under the conditions of the experiment. Ilyonectria (Cylindrocarpon) was found to be more dominant in the fungal community of nonfumigated roots and rhizosphere soil compared with fumigated. These results demonstrate that P. penetrans, Fusarium, and Pythium rapidly rebound after nontarped broadcast fumigation in raspberry with the industry standard Telone C-35.

doi:10.1094/PHP-01-18-0006-RS

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