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Project description

Developing Damage/Economic Thresholds for Sugarbeet Cyst Nematode on Cole Crops. (96CC024)
Program UC IPM competitive research grants program
Principal
investigators 		B.B. Westerdahl, Nematology, UC Davis
E.P. Caswell-Chen, Nematology, UC Davis
R.F. Norris, Vegetable Crops, UC Davis
Host/habitat Cole Crops; Broccoli
Pest Sugarbeet Cyst Nematode
Discipline Nematology
Review
panel 		Cultural Controls
 Start year (duration)  1996 (Three Years)
Objectives Develop damage/economic thresholds for sugarbeet cyst nematode on cole crops.
End-year
progress 		Development of damage thresholds for the sugarbeet cyst nematode (SBCN) will permit nematicide use only when justified by expected damage and economic returns. We conducted three field trials in broccoli fields in the Salinas area during 1998. In each field we placed 100 small plots to assess the relationship between the population density of SBCN at planting with the yield realized at the end of the season. We recorded the yield of different quality classes of broccoli (export, domestic, and salad) during the commercial harvest period. All fields had a range of SBCN densities, and total broccoli yield over the plots was negatively correlated with the initial population density of SBCN present in the small plots at planting. However, the data we have thus far collected do not allow us to successfully establish a damage threshold for broccoli in the field. Field plots have been established to monitor the reproduction of SBCN on weeds under field conditions. These data will be compared with our previous results obtained in greenhouse and laboratory experiments.

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