Response of hop cultivars to downy mildew and Hop mosaic virus

摘要

A 0.25 acre hop yard was established at the Ohio Agricultural Research and Development Center, Horticultural Research Unit 2 in Wooster, OH to evaluate the disease response of hop cultivars in OH. The field was disked and leveled, raised beds were prepared, and landscape fabric was laid over the beds on 6 May. Hop cultivars (Cascade, Centennial, Columbus, Galena, Mt. Hood, Nugget, Sterling, Willamette) were transplanted into silt loam soil on 8 May. The experiment was established using a randomized complete block design with 4 replications. Plants were spaced 3 ft apart on 10 ft centers under a 17 ft trellis with two strings per plant, and two bines were trained per string. The field was hand watered and hand weeded as necessary. Incidence and severity of downy mildew and Hop mosaic virus (HpMV) was determined on 27 Sep, 4 and 11 Oct. The severity of the diseases on foliage was evaluated using a scale of 0-100% foliage affected. Plant height was estimated visually using a scale of 1-3 (1=1-20 in.;2=21-40 in.; 3=>40 in.) on 27 Sep, and 4 and 11 Oct. Average maximum temperatures for 8-31 May, Jun, Jul, Aug, Sep, and 1-11 Oct were 73.8, 78.5, 81.5, 80.2, 74.4, and 74.1°F; average minimum temperatures were 49.7, 58.1, 63.1, 58.4, 51.9, and 52.6°F;and total rainfall amounts were 2.0, 5.0, 6.6, 2.0, 2.9, and 2.3-in., respectively. Analysis of variance was performed using the general linear models procedure with SAS statistical software and means were separated using Fisher's least significant difference test.