PCR detection of Pseudoperonospora humuli and Podosphaera macularis in Humulus lupulus
2005; Czech Academy of Agricultural Sciences; Volume: 41; Issue: 4 Linguagem: Inglês
10.17221/2749-pps
ISSN1805-9341
Autores Tópico(s)Plant Pathogens and Resistance
ResumoHop (Humulus lupulus L.) is a dioecious, perennial, climbing plant and only female individuals are cultivated.Female inflorescences, referred to as cones, are commercially used in brewing, and the pharmaceutical and cosmetics industry.Unfortunately, the plants are regularly subjected to infection by oomycetal and fungal pathogens.The infection sometimes results in severe loss of production as the plants wither (NEVE 1991).Pseudoperonospora humuli (Miabe and Takah.)Wilson is the causal agent of hop downy mildew, a disease occurring worldwide.The pathogen infects young shoots, leaves, flowers and cones, causing "basal spikes", angular black leaf spots and brown discolouration of cones (NEVE 1991).Oospores are formed in infected shoots and cones (CHEE & KLEIN 1998).Although hop downy mildew has not been extensively studied, the fine structure of the sporangium was described by CONSTAN-TINESCU (2000).Podosphaera macularis (Braun) syn.Sphaerotheca macularis (Wallr.:
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