2011 Annual Report
1a.Objectives (from AD-416)
1. determine recolonization potential of P. penetrans in broadcast vs. bed fumigated fields;
2. quantify the impact of fumigation treatments and P. penetrans on red raspberry
3. promote implementation of fumigant alternatives through field days, grower
meetings, web-based decision-making tools, and printed materials.
1b.Approach (from AD-416)
We will identify 4-6 fields located in northern Washington raspberry fields and
establish replicated plots comparing broadcast fumigation to bed fumigation. In
these plots plant-parasitic nematode population densities, plant establishment and plant growth will be monitored over a multiple year period. In collaboration with WSU extension, written and web-based materials will be created and disseminated that help raspberry growers navigate the new EPA fumigation requirements.
Red raspberries are a major crop in the Pacific Northwest with a farmgate value of over $64 million. The root lesion nematode, Pratylenchus penetrans, is a significant pest of raspberry resulting in reduced plant establishment and decline in yield. Currently, red raspberry growers do not have adequate information to make informed decisions regarding alternative, reduced chemical nematode management practices. This two-year project is striving to begin to close these knowledge gaps and provide red raspberry growers with information so they can make informed nematode management decisions. To this end, during year one of this project five field experiments were established to determine the potential of root lesion nematode to recolonize areas treated with reduced rates of pesticides and to determine the impact of root lesion nematode and alternative, reduced chemical nematode management practices on raspberry establishment. In addition, to promote the implementation of alternative nematode management practices two grower field days were held and a survey was conducted to determine grower attitudes towards nematodes and management practices. In the future a web-based tool will be developed to assist growers in choosing alternative, reduced chemical nematode management practices.
Methods of project monitoring included meetings, e-mail, and phone calls.