2. University of Minnesota Organic Research Initiative Multi-disciplinary Focus research efforts Connect with stakeholders Improve funding potential Get Involved!
14. “…the raspberries produced from the high tunnel were absolutely phenomenal….” “Some of the biggest I have ever seen.” “…plump, sweet and tart!!!! Nice bright color…not bruised at all.” “We loved the raspberries....” -Joshua O’Brien, Executive Chef University of Minnesota Morris Sodexo Campus Services
32. High Tunnel Primocane-Fruiting Raspberry Production at Grand Rapids- Year Two Shengrui Yao Department of Horticulture North Central Research and Outreach Center
33. Objectives: Evaluate five primocane-fruiting raspberry cultivars Compare their performance in the high tunnel with field planting Monitor temperature changes in high tunnel and potential winter damage Monitor pest and disease problems in the high tunnel Disseminate the information to potential growers Special thanks to Northeast Minnesota Sustainable Development Partnership for their support of this project
34. Tunnel management: Drip irrigation with 2 T-tapes/row Fertigation for soil fertility management in 2009 Opening/closing tunnel sides to control tunnel temperature Many wild bumble bees and honey bees for pollination occurred naturally in the area Propane heater for frost protection
35. Yield data In 2008, total of 154 lb of berries were harvested from our 21x48 ft high tunnel from August 5 to November 6. In 2009, total of 379lb of berries were harvested from our 21x48 ft high tunnel which was equivalent to 16,000 lb/acre from August 5 to November 2. In 2009, 80 lb of berries were harvested from the field planting from August 12 to October 5.
38. Productivity (2009): Average HT berry weight (g) XAutumn Britten had double fruits in 2008 which made the average berry weight higher. *This yield is the berry weight per plant of the “original planting” in 2008.
39. Cultivars: Autumn Bliss: small fruit, fewer canes, very thorny, mid season. Autumn Britten: nice fruit, fewer canes, mid season, (double berries) Caroline: most vigorous, lots of canes and branches, nice flavor and fruits, very productive, moderate thorns, late cultivar Joan J: nice and big fruit, thornless, mid season cultivar Polana: very early, short plants, small and glossy fruits, moderate thorns Bare root plants were planted in the high tunnel at May 9, and in the field on May 12, 2008 Hand thinned most of Caroline plots and some Joan J plots in mid May and early July, 2009.
45. Raspberry Pests and Diseases at Grand Rapids High tunnel: Raspberry sawflies for both 2008 and 2009 Spider mites Appeared later in the season in 2008 without treatment; Released parasitic mites and spot treated with insecticidal soap in 2009 Cane borer (one cane in 2008) Crown gall (one plant in 2008) No other disease pressure Field: only raspberry sawfly in 2008 and 2009
46. What we learned in 2008 and 2009 High tunnel primocane-fruiting raspberry is doable in MN even in northern MN Tissue culture plants are highly recommended Cane thinning and early pinching may be necessary for some vigorous cultivars Limit N application if N was high in your high tunnels Heat equipment is necessary for frost protection in northern Minnesota
Notas do Editor
Emily H: Introduce UM High Tunnel Berry researchWhy this projectEPA goalsEtc.
Emily H talk about funding sources
Steve present Morris project chronologically
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Steve talk about trellis. Intermediate string needed to support mid size canes.Broken cane picture.
Steve talk about harvest in high tunnel and outside.
Harvest and chef comments (comments listed on next slide)
Steve share comments from UMM chef.
Steve: supplemental heatingRecommended min. 42000 BTU for this size high tunnel. Share BTUs, cost, etc. of new heater.
Turn it over to Emily T. to present data
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Ron talk about high tunnel benefits, Joan J, harvest, pest complex in high tunnels compared to field.
Ron talk about spider mite damage
Ron talk about what he did to control spider mites;persimilis predatory mite that Emily T. ordered, did it work to control spider mites? Rates of release, timing, etc. Any other details.Steve tell what you did to control spider mites (monitoring, lens magnification?, high pressure water, hort oil)
Ron or Emily T or Emily H talk about data from Alex.
