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ARS Home Pacific West Area Hilo, Hawaii Daniel K. Inouye U.S. Pacific Basin Agricultural Research Center Tropical Plant Genetic Resources and Disease Research Research Publications at this Location





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Title:   Author  item
                                            Keith, Lisaitem
                                            Matsumoto Brower, Tracieitem
                                            Suzuki, Jonitem
                                            Follett, Peteritem
                                            Zee, Francis
  Submitted to: Pacific Agriculture and Natural Resources
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 4/19/2015
                                    Publication  Date: 7/2/2015
                                    Citation: Keith, L.M., Matsumoto Brower, T.K., Suzuki, J.Y., Follett, P.A., Zee, F.T. 2015. Screening for powdery mildew resistance in ohelo berry germplasm in Hawaii. Pacific Agriculture and Natural Resources. 1:1-9.Interpretive Summary: Ohelo berry is an endemic Hawaiian shrub and a food source of the endemic nene goose. To alleviate impacts to the environment during the wild gathering of fruits Ohelo cultivars for small-scale cultivation were selected. Powdery mildew was found to be the main disease affecting Ohelo. Plants were screened for potential sources of host resistance.
                                Technical Abstract: Ohelo, Vaccinium reticulatum (Smith), is an endemic Hawaiian shrub, less than 1 m (3.3 ft) tall, and grows between 640 and 3700 m (2,100 to 12,100 ft) elevation on disturbed volcanic sites on the islands of Maui and Hawaii. Concerns have arisen about human impacts to the environment during the wild gathering of fruits that include spreading of exotic weeds, damaging native vegetation, and reducing a food source of the endemic nene goose, Banta sandvicensis (Vigor). As an alternative to wild harvest, ohelo cultivars for small-scale cultivation as ornamentals and for edible berries in Hawaii were identified, evaluated and selected. The main disease pressure that may limit berry production and ornamental qualities was determined to be from powdery mildew. Numerous disease resistance screens of diverse ohelo berry germplasm were conducted to identify potential powdery mildew resistance. Controlled inoculations were made onto leaf discs and potted seedlings in a growth chamber. The results were compared with natural epidemics in two locations on Hawaii Island, Mealani and Lalamilo, approximately 55 miles north of Hilo. There was a good correlation of ratings between the field and growth chamber experiments. None of the selected ohelo accessions were resistant to infection. However, accession N09-16 was consistently rated as tolerant for the first month of testing regardless of location. The results emphasize the importance of uniform testing in multiple environments using the most appropriate host material available.


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