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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Distribution of wild cucumber, Echinocystis lobata Torr. et A. Gray, in the Hradec Králové region.
 HOLEČKOVÁ, Veronika
The aim of this work was elaboration of known locations invasive liana Echinocystis lobata (Michx.) Torr. et A. Gray in Královéhradecký region, but completion of new locations from my own cross ? country research too. I have acquired 42 locations by literal excerption, three new locations by my own cross ? country research and next three locations by contacting several persons. Primary distribution area is in North America, but currently in the Czech Republic it takes place very fast, mainly off shores of rivers or brooks. From here this species is expanding to surroudings, first of all along water corse, on meadows and dust ? hole. I would like to show the reality how dangerous this species can be for natural habitats.
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The Influence of Pesticides on the Infectivity of Entomopathogenic Nematodes
 NERMUŤ, Jiří
It is known that entomopathogenic nematodes rarely live in fields where pesticides and fertilizers are used. Because they are organisms with a high potential for biological and integrated pest control the thesis tried to determine the influence of pesticides on the infectivity and mortality of selected nematodes: Steinernema feltiae, S. arenarium and S. kraussei in water solution of some pesticides. The results are that preparations Vydate (a. i. oxamyl) and Sulka (a. i. sulphur) have the highest negative influence on both characteristics. These pesticides cause a mortality of 94.3 - 99.9 % and reduce infectivity by about 50 {--} 75 % (level 3). The following preparations may be identified as having higher potential for infectivity reduction: above all, Starane 250 EC (fluroxypyr), Sumithion super (fenithrothion), and Novozir MN 80 (mancozeb); on the other hand, Treflan 48 EC (trifluralin) significantly increases mortality. Another important observation is a fact that infectivity is significantly influenced only by concentration of pesticides, not by exposure time. During an experiment with enhacement of resistance to oxamyl (Vydate) I falling mortality and increasing infectivity of entomopathogenic nematodes were observed after five rounds.
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