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Impact and Occurrence of Phytophthora rubi and Pratylenchus penetran s in Commercial Red Raspberry ( Rubus ideaus ) Fields in Northwestern Washington

2013; Taylor & Francis; Volume: 13; Issue: 4 Linguagem: Inglês

10.1080/15538362.2013.748373

1553-8362

Jessica Gigot, Thomas W. Walters, Inga A. Zasada,

Plant Disease Management Techniques

Red raspberry (Rubus idaeus) production is a vital component of northwestern Washington's agriculture. The main objectives of this study were to document the occurrence of soilborne pathogens Phytophthora rubi and Pratylenchus penetrans in early stage production fields, relate this information to soil properties, and better understand the individual and combined effect of P. rubi and P. penetrans on raspberry root health. P. rubi was found at each field and P. penetrans population densities were variable (0 to ∼8000 nematodes/g dry root) across locations. In controlled greenhouse studies, P. rubi was very pathogenic to red raspberry ‘Meeker’ at densities >10 oospore/gram soil and there was no interaction between P. rubi and P. penetrans. P. rubi is endemic to raspberry production in this region, and is an aggressive pathogen on raspberry. However, the chronic damage to roots caused by P. penetrans should not be ignored.