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Petrzik, K. and P. Svoboda (1997). Screening of apple mosaic virus in hop cultivars in the Czech Republic by reverse transcription-polymerase chain reaction. Acta Virologica 41(2): 101-103. Inst. Plant Mol. Biol., Academy Sci. Czech Republic, Branisovska 31, 370 Ceske Budejovice, Czech Republic

Polley, A., E. Seigner, et al. (1997). Identification of sex in hop (Humulus lupulus) using molecular markers. Genome 40(3): 357-361. {a} Inst. Plant Genetics, Crop Plant Res., Corrensstrase 3, D-06466 Gatersleben, Germany

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Stevens, J. F., M. Ivancic, et al. (1997). Prenylflavonoids from Humulus lupulus. Phytochemistry Oxford 44(8): 1575-1585. {a} Dep. Agric. Chem., Oregon State Univ., Corvallis, OR 97331, USA

Strong, W. B., B. A. Croft, et al. (1997). Spatial aggregation and refugia of the mites Tetranychus urticae and Neoseiulus fallacis (Acaria: Tetranychidae, Phytoseiidae) on hop. Environmental Entomology 26(4): 859-865. {a} British Columbia Ministry Forests, Kalamalka Seed Orchard, 3401 Reservoir Road, Vernon, BC V5B 2C7, Canada

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Vierbergen, G. (1997). Two species of thrips new for the Netherlands: Thrips albopilosus and Haplothrips kurdjumovi (Thysanoptera: Thripidae; Phlaeothripidae). Entomologische Berichten 57(9): 139-141. {a} Plantenziektenkundige Dienst, Sectie Entomol., Postbus 9102, 6700 HC Wageningen, Netherlands

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Batista, D., M. J. Sousa, et al. (1996). Plant regeneration from stem and petiole-derived callus of Humulus lupulus L. (Hop) clone Braganca and var. Brewer's Gold. In Vitro Cellular and Developmental Biology Plant 32(1): 37-41. Dep. Biologica Vegetal, Faculdade Ciencias Lisboa, Campo Grande-Bloco C2 1 Piso, 1780 Lisboa, Portugal

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Eppler, A. (1996). Virus infestation, symptom expression and population density of settling damson hop aphids (Phorodon humuli) in hops (Humulus lupulus). Mededelingen Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen Universiteit Gent 61(2a): 311-319. Inst. Phytopathol. Angewandte Zool., Justus-Liebig-Univ., D-35390 Giessen, Germany

European, A. M. P. P. O. (1996). Guideline on good plant protection practice: Hop/Houblon. Bulletin OEPP 26(2): 295-309.

Field, J. A., G. Nickerson, et al. (1996). Determination of essential oils in hops by headspace solid-phase microextraction. Journal of Agricultural and Food Chemistry 44(7): 1768-1772. {a} Dep. Agric. Chem., Oregon State Univ., Corvallis, OR 97331, USA

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Jagadish, V., J. Robertson, et al. (1996). RAPD analysis distinguishes Cannabis sativa samples from different sources. Forensic Science International 79(2): 113-121. {a} Res. Sch. Biological Sci., CRC Plant Sci., Inst. Advanced Studies, Australian Natl. Univ., Canberra, Australia

Moraczewski, I. R., W. B. Sudnik, et al. (1996). Rough sets in floristic description of the inner-city of Warsaw. Flora Jena 191(3): 253-260. {a} Dep. Plant Systematics, Warsaw Univ., Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland

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Pillay, M. and S. T. Kenny (1996). Structure and inheritance of ribosomal DNA variants in cultivated and wild hop, Humulus lupulus L. Theoretical and Applied Genetics 93(3): 333-340. {a} Dep. Plant Soil Sci., Alabama A and M Univ., P.O. Box 1208, Normal, AL 35762, USA

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