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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Effect of metapopulation structure and environmental factors on population biology of Impatiens noli-tangere infected by powdery mildew Podosphaera balsaminae
 Chalupníková, Jana ; Koubek, Tomáš (advisor) ; Čuda, Jan (referee)
Studies performed on natural pathosystems revealed that the spatial structure of the metapopulation plays an important role in the development and spread of disease; phytopathological experimental studies have also revealed a significant effect of climatic factors on the presence of the disease (incidence) and the level of infection (prevalence) in populations. The aim of this study was to explore a natural pathosystem from both sides at the same time and to see which local and spatial environmental factors influence the development of pathosystem. Study focuses on population biology of natural pathosystem Podospaera balsaminae - Impatiens noli-tangere, which has not been investigated yet. In the study area (between the city Sázava (Benešov district) and village Vlkančice) host populations occurred in 78 (64 of them were infected) in 2013 and 82 populations (61 of them were infected) in 2014. Size of host populations had the strongest effect to incidence and prevalence of disease in the pathosystem. In larger populations, the disease occurred more often, developed faster and was higher. The rate of spread of the pathogen territory and the rate of population host connectivity had also strong effect. The abundance of pathogen in the studied area and the level of connectivity of host populations also...
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Wheat streak mosaic virus: an important disease in cereal crops
 Kumar, Jiban ; Slavíková, Lucie ; Chalupníková, Jana
Wheat streak mosaic virus (WSMV) causes serious disease in cereal crops, particularly in wheat. The main symptoms caused by WSMV include chlorotic streak mosaic on leaf, which become necrotic and gradually dry form the top of the leaf. In severe infection plant stunting and spike become sterile. WSMV is transmitted by cereal curl mite Aceria tosichella, and in low level (up to 1.5%) also transmitted by seeds. WSMV was detected in first time in the former Czechoslovakia in early eighties. The incidence of the virus in recent years is growing in the Czech Republic and even severe occurrence and wide distribution in some wheat fields in different regions of the country was determinated. This methodology put together recent knowledge of WSMV and its vector, including the incidence and possibilities of control cereal crops against the virus.
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1 Chalupníková, Julie
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