Plant Protection Science, 1999 (vol. 35), issue 4
Index of Volume 35 (1999)Index
editors
Plant Protect. Sci., 1999, 35(4):I-IV 
Analysis of populations of Pyrenophora teres on barley in the Czech RepublicOriginal Paper
Věra Minařiková, Ivana Polišenská
Plant Protect. Sci., 1999, 35(4):115-120 | DOI: 10.17221/9777-PPS
One of t he diseases that have become i mportant in the Czech Republ ic recently is net blotch of ba rley caused by Pyrenophora teres (Died.) Drechs., with the imperfect stale Drechslera teres. In 1 995-1997 infected leaves of both spring and winter barley were collected in various stands and climatic regions. Al most 400 isolates of the pathogen were obtained and tested for virulence using a differential set (Cl 5791. CI 2750, CI 9819, C 8755, Stcudclli, Harbin, C 29192, CI 739, Tifang. and the suscepti ble control Beate). To assess their reaction, the laboratory method for testing leaf segments on benzimidazole was used....
Antagonistic microorganisms and medium moisture as possible sources of variation in common bunt (Tilletia tritici) incidenceOriginal Paper
Jaroslav Benada, Antonín Pospíšil
Plant Protect. Sci., 1999, 35(4):121-123 | DOI: 10.17221/9778-PPS
Antagonistic soil microorgan isms decreased the germination of Tilletia tritici teliosporcs in dependence on the concentration of three formulations (Polyversum®, Supresivit® and lbefunginused and added in or on water agar. A higher content of water in the agar also decreased the germination, and water d rops on the agar surface inhibited it entirely. The presence and concentration of antagonistic microorganisms and soil moisture can vary in the soil and it is supposed that this may cause the variation in bunt incidence in field. This variation has to be taken into consideration in particular in variety trials....
Plant virusees, unique and intriguing pahtogens - a textbook of plant virology: Book ReviewBook Review
Josef Špak
Plant Protect. Sci., 1999, 35(4):124 | DOI: 10.17221/9779-PPS
Population changes of the potato cyst nematode (Giobodera rostochiensis) during irregular crop rotationOriginal Paper
Josef Šedivý
Plant Protect. Sci., 1999, 35(4):125-130 | DOI: 10.17221/9780-PPS
For a period of 17 years, changes in the n umber of potato cyst nematode (PCN) cysts in the soil and in their contents were studied in two fields with an irregular crop rotation and growing resistant and susceptible potato cultivars. In all years, numbers of cysts per I 00 g of soil were higher at Skorkov (S) than at Ot radovice (0). At the beginning of the experiment, the percentages of empty PCN cysts were 30 and 28%, respectively, but they increased to 92.5 and 94.6%, respectively, by the end of it. The remaining cysts contained dead eggs/larvae and empty egg cases. Thus, the number of cysts per I 00 g of soil cannot be used to estimate the degree...
Effectiveness of aphid parasitoids (Hymenoptera: Aphidiidae) on winter wheat in two agricultural systemsOriginal Paper
Shoki Al-Dobai, Ján Praslicka
Plant Protect. Sci., 1999, 35(4):131-135 | DOI: 10.17221/9781-PPS
From the obtained results we can note that the parasitoids in our experiments in 1 997 and 1998 had considerable influence on decline of aphids population density, at which the percent of parasitization in milk maturity stage of wheat was from 2.7 to 35%. The culmination of parasitization was recorded in our experiments about 7-10 days after the culmination of population density of aphids. The obtained results did not confirm the definite influence of different growing systems on parasitization of aphids, because in 1997 the parasitization was very high in integrated growing system and in 1998 in ecological growing system. The influence of different...
Biological control of stored food mites on oilsecds using the mite predator Cheyletus eruditus (Schrank)Original Paper
Eva Žďárková, Radek Feit
Plant Protect. Sci., 1999, 35(4):136-138 | DOI: 10.17221/9782-PPS
The suppressive biological control of mites on oilseeds can be successful under the circumstances of the ratio of prey and predators being I : 20 to 1 : 50 and the original infestation not being higher than 500 specimens per 1 kg. Preventive biological control was carried out in empty oilseed stores after they were cleared. The predators which were released in the stores 2000 specimen s being evenly distributed over an area of 100 m2 were successful and suppress the population of acaroid mites.
Geographic distribution of the field vole (Microtus arvalis) in the Czech RepublicOriginal Paper
Milan Zapletal, Dagmar Obdržálková, Jiří Pikula, Jiří Pikula jr, Miroslava Beklová
Plant Protect. Sci., 1999, 35(4):139-146 | DOI: 10.17221/9783-PPS
The ecological distribution and requirements of the field vole (Microtus arvalis) were studied, using data on its population density in individual districts of the Czech Republic from 1955 to 1990. The field vole was found to be distributed from lowlands to the sub-alpine level, i.e., from 150 to 1600 m above sea-level. It inhabits continuously and reproduces regularly in nine different biotopes of the Czech Republic. Geographic areas of regular overcrowding of field voles correspond with areas of most suitable living conditions. Of climatic conditions the field vole prefers mainly moderately wa1m climatic regions and these are inhabited...
Weed control by flaming and hot steam in apple orchards
N. Rafai, M. Lacko-Bartošová, R. Somr
Plant Protect. Sci., 1999, 35(4):147-152
Field experiments to investigate the efficacy of weed control by flaming, hot-steam and mulching on the natural weed flora at different developmental stages were conducted in apple orchards in Nova Scotia, Canada. The perennial weed most resistant to flaming was Malva neglecta, with no control at a total gas dose of 320 kg/ha. The effect of flaming on annual weeds depends mainly on the developmental stage of weed species and the propane dose required for the desired control level. To control annual weeds at later developmental stages (> 6 true leaves), single flame treatment with a propane dose of 54-40 kg/ha was not sufficient. For Chenopodium...