Plant Protection Science, 2007 (vol. 43), issue 4

INDEX OF VOLUME 43 (2007)-

editors

Plant Protect. Sci., 2007, 43(4):I-VIII | DOI: 10.17221/2244-PPS  

Detection of Clavibacter michiganensis subsp. sepedonicus in daughter tubers of volunteer potato plants

Iveta Pánková, Václav Krejzar, Jaroslav Čepl, Václav Kůdela

Plant Protect. Sci., 2007, 43(4):127-134 | DOI: 10.17221/2237-PPS  

Daughter tubers of volunteer potatoes were tested for their ability to maintain Clavibacter michiganensis subsp. sepedonicus (Cms). In different areas of the CR, volunteer potatoes were searched for in crops grown in rotation with potatoes and where one or two years before Cms had been detected and identified in samples of harvested seed or commercial potatoes using the test scheme in accordance to EC Directive 93/85/EEC. During May and June of 2005 and 2006, emerging or emerged plants of volunteer potatoes were collected at nine locations of Bohemia and transplanted to the experimental field in the Diagnostic Service Laboratory...

Fusarium spp. In wheat grain in the Czech Republic analysed by PCR method

Jan Nedělník, Hana Moravcová, Jana Hajšlová, Kateřina Lancová, Marie Váňová, Jaroslav Salava

Plant Protect. Sci., 2007, 43(4):135-137 | DOI: 10.17221/2241-PPS  

The frequency of occurrence of four Fusarium spp. on wheat in the Moravia region, Czech Republic, was determined by polymerase chain reaction (PCR). Grain samples were collected during 2003-2006 at grain purchase centres. The dominant species was F. graminearum, which was recorded in all samples of the first 3 years of the study and in 88% of them in 2006. The previously more frequent F. culmorum was detected in 100 % of the samples only in 2005; in the preceding two years the frequency of its detection was lower, 84% and 60%, and in 2006 it was detected in 55% of the samples. Fusarium avenaceum had a very low occurrence...

Reaction of winter wheat cultivars to common bunt Tilletia tritici (Bjerk.) Wint. and T. laevis Kühn

Veronika Dumalasová, Pavel Bartoš

Plant Protect. Sci., 2007, 43(4):138-141 | DOI: 10.17221/2238-PPS  

Fifteen registered winter wheat cultivars were tested for reaction to common bunt in 2-years trials. A mixture of seven Czech proveniences of common bunt was used for inoculation. Cvs Globus and Bill were most resistant in both years. The reaction of these two cultivars to 16 Czech and German samples of common bunt of different proveniences was also tested. On cvs Globus and Bill only one sample in one year caused bunt incidence 29.3% and 19.3%, whereas the incidence caused by other bunt samples was below 10% and 15%, respectively.

Contribution to identify the causal gents of Dutch elm disease in the Czech Republic

Miloň Dvořák, Michal Tomšovský, Libor Jankovský, David Novotný

Plant Protect. Sci., 2007, 43(4):142-145 | DOI: 10.17221/2243-PPS  

This study provides new data on Dutch elm disease in the Czech Republic. Ophiostoma novo-ulmi is reported for the first time in the area of the Czech Republic, as well as both subspecies ssp. novo-ulmi (indigenous in the area of the Ukraine and Moldavia), and ssp. Americana indigenous in North America. The majority of the recorded strains belonged to O. n.-u. ssp. novo-ulmi, while O. n.-u. ssp. Americana and hybrids of these two subspecies were found less frequently. On the other hand, Ophiostoma ulmi was not found at all in the investigated samples. Identification on the subspecies...

Changes in the occurrence of mycoflora on caraway seeds after fungicide application

Lenka Odstrčilová

Plant Protect. Sci., 2007, 43(4):146-150 | DOI: 10.17221/2240-PPS  

The spectrum of diseases and their harmfulness to caraway has changed within the past few years. The importance of Mycocentrospora acerina, recently regarded as the most serious pathogen, has decreased while the severity of other fungi, such as Erysiphe heraclei or Ascochyta carvi, has increased. This work was undertaken to identify and determine the incidence of fungi which contaminate the seeds and to evaluate the effect of fungicidal treatment. Direct microscopic evaluation confirmed that Alternaria alternata and Cladosporium cladosporiodes were the most common fungi occurring on caraway seeds. Cladosporium...

Effect of surfactants and liquid fertilisers on transcuticular penetration f fungicides

Vladimíra Zelená, Karel Veverka

Plant Protect. Sci., 2007, 43(4):151-156 | DOI: 10.17221/2236-PPS  

Penetration of active compounds into the leaves plays an important role in their systemic activity. The effect of surfactants and liquid fertilisers on the penetration of fungicides was studied in model trials with the cuticle from Bryophyllum calycinum. Solutions of the fungicides were pipetted on pieces of cuticle laid on agar covered by spores of Cladosporium cladosporioides. The diameters of the inhibitory zones were measured and served to gauge the level of penetration by the variants. The size of the inhibitory zone of the control variant of Alto Combi 420 SC pipetted on the cuticle was only reduced to 92.6% of the variant where...

Sensitivity of fungi to urea, ammonium nitrate and their quimolar solution UAN

Karel Veverka, Jindra Štolcová, Pavel Růžek

Plant Protect. Sci., 2007, 43(4):157-164 | DOI: 10.17221/2239-PPS  

The sensitivity of oomycota, saprophytic and pathogenic fungi to urea, ammonium nitrate and UAN (urea plus ammonium nitrate in equimolar solution) was studied in laboratory trials. The compounds were applied in agar in concentrations of 0.06, 0.19 and 0.6M. The most toxic was urea. Ammonium nitrate inhibited the growth of fungi only in higher concentrations. In contrast, the growth of Gaeumannomyces graminis was stimulated by even the highest concentration of 0.6M ammonium nitrate. The fungi most sensitive to urea and UAN were Alternaria tenuissima, Botrytis cinerea, Cladosporium cladosporioides and Pseudocercosporella herpotrichoides....

First records of Leptoglossus occidentalisdemann, 1910 (Heteroptera: Pentatomorpha: Coreidae) in the Czech Republic

Jakub Beránek

Plant Protect. Sci., 2007, 43(4):165-168 | DOI: 10.17221/2242-PPS  

In the autumn of 2006 and summer 2007 the coreid species Leptoglossus occidentalis Heidemann, 1910 was detected in the Czech Republic for the first time as a new alien insect species. It is native to North America, where it causes important seed losses on coniferous trees, especially pines. From Europe it is known since the end of the last century, when it was introduced to Italy. Its repeated finding could indicate a vital population of this species in the Czech Republic, not only introduced individuals.