scholarly journals Ovicidal effects of thiacloprid, acetamiprid, lambda-cyhalothrin and alpha-cypermethrin on Bruchus pisorum L. (Coleoptera: Chrysomelidae) eggs

2011 ◽  
Vol 47 (No. 3) ◽  
pp. 109-114 ◽  
Author(s):  
M. Seidenglanz ◽  
J. Rotrekl ◽  
J. Poslušná ◽  
P. Kolařík
Keyword(s):  
Czech Republic ◽  
Field Conditions ◽  
Egg Survival ◽  
The Czech Republic ◽  
Real Effects ◽  
First Instar ◽  
Lambda Cyhalothrin ◽  
Ovicidal Effects ◽  
Bruchus Pisorum

The effects of two pyrethroid (lambda-cyhalothrin, alpha-cypermethrin) and two neonicotinoid (acetamiprid, thiacloprid) insecticides on B. pisorum L. eggs were compared under field conditions in the Czech Republic in 2005–2007. The main objective of the study was to find out what real effects can be expected from the available insecticides registered in Europe when applied at the time of the first egg occurrence on lower pods. In general, the rates of Bruchus pisorum egg (+ first instar larvae) survival were significantly lower with all the insecticides compared in the study, in each of the three years (2005, 2006, 2007). The tested insecticides showed some ovicidal effects and also some larvicidal effects. The tested pyrethroids (lambda-cyhalothrin, alpha-cypermethrin) showed somewhat higher effectiveness in comparison with the neonicotinoids (acetamiprid, thiacloprid). Alpha-cypermethrin was the most effective in all three years. In 2006 and in 2007 this insecticide significantly reduced the rates of egg survival in comparison with acetamiprid. In contrast, acetamiprid was the least effective insecticide in each of the three years.

scholarly journals Meligethes aeneus (Coleoptera: Nitidulidae) resistance to lambda-cyhalothrin in the Czech Republic in 2012 and 2013

2016 ◽  
Vol 51 (No. 2) ◽  
pp. 94-107 ◽  
Author(s):  
M. Seidenglanz ◽  
J. Poslušná ◽  
J. Rotrekl ◽  
P. Kolařík ◽  
E. Hrudová ◽  
...  
Keyword(s):  
Czech Republic ◽  
Meligethes Aeneus ◽  
The Czech Republic ◽  
Lambda Cyhalothrin

scholarly journals Evidence and symptoms of pasta infestation by Sitophilus oryzae (Curculionidae; Coleoptera) in the Czech Republic

2010 ◽  
Vol 40 (No. 3) ◽  
pp. 107-111 ◽  
Author(s):  
V. Stejskal ◽  
Z. Kučerová ◽  
J. Lukáš
Keyword(s):  
Czech Republic ◽  
Sitophilus Oryzae ◽  
Field Conditions ◽  
Plant Health ◽  
Optical Methods ◽  
The Czech Republic ◽  
Photo Documentation ◽  
First Time ◽  
Heavy Infestation

Heavy infestation of pasta by the internally feeding pest <I>Sitophilus oryzae </I>(<I>Coleoptera</I>: <I>Curculionidae</I>)<I> </I>was recorded for the first time under field conditions in the Czech Republic. Symptoms of hidden infestation (eggs, larvae, pupae and adults) and a comparison of optical methods to detect them are described for the use by farmers, plant health and phytoquarantine inspectors. Photo-documentation is included.

scholarly journals The importance of monitoring the Ceutorhynchus pallidactylus female flight activity for the timing of insecticidal treatment

2009 ◽  
Vol 45 (No. 3) ◽  
pp. 103-112 ◽  
Author(s):  
M. Seidenglanz ◽  
E. Poslušná J Hrudová
Keyword(s):  
Czech Republic ◽  
Flight Activity ◽  
Field Conditions ◽  
Substantial Proportion ◽  
The Czech Republic ◽  
Water Traps ◽  
Insecticidal Treatment ◽  
Ceutorhynchus Pallidactylus

The effects of two pyrethroids and one combination of organophosphate and pyrethroid (alpha-cypermethrin, etofenprox, chlorpyrifos + cypermethrin) on <I>Ceutorhynchus pallidactylus</I> (Marsham, 1802) (<I>Coleoptera: Curculionidae</I>) were tested under field conditions in the Czech Republic in 2006–2008. Significant differences in the effects of the compared insecticides on <I>C. pallidactylus</I> were recorded in the particular years (2006, 2007, 2008). It was less important and somewhat less complicated to establish the most suitable time for spraying in the case of the chlorpyrifos + cypermethrin combination in comparison with the pyrethroids applied separately. The effectiveness of the tested insecticides was markedly influenced by the time of spraying. The effects of the pyrethroids applied singly achieved results comparable to those of the chlorpyrifos + cypermethrin combination only at the optimal spraying time. The most suitable time for spraying varied from the point when the first females appeared in yellow water traps in somewhat higher quantities to the time when a substantial proportion of caught females was able to lay eggs.

scholarly journals Significance of Sexual Reproduction of Phytophthora infestans in the Czech Republic

2018 ◽  
Vol 66 (5) ◽  
pp. 1191-1197
Author(s):  
Jana Mazáková ◽  
Miloslav Zouhar ◽  
Pavel Ryšánek
Keyword(s):  
Czech Republic ◽  
Late Blight ◽  
Sexual Reproduction ◽  
Phytophthora Infestans ◽  
Growing Season ◽  
Field Conditions ◽  
Effect Of Temperature ◽  
Mating Types ◽  
The Czech Republic ◽  
Leaf Discs

A total of 187 naturally late blight‑diseased potato leaves were sampled from 31 sites and five regions of the Czech Republic during the growing season in 2012–2014 and 2016 and examined microscopically for the ability of Phytophthora infestans to produce oospores in infected leaves under field conditions. Although the occurrence of the A1 and A2 mating types required for sexual reproduction of P. infestans was previously confirmed in the Czech Republic, no oospores were detected in this study. To study the effect of temperature on the survival of oospores produced from crosses of three pairs of P. infestans isolates, oospores in leaf discs and agar were exposed to temperatures ranging from –24 to 10 °C and then evaluated for viability with the plasmolysis test. Oospore viability ranged from 13.02 to 63.90 % and from 7.77 to 63.37 % for oospores produced in agar and leaf discs, respectively, with the highest frequencies of viable oospores occurring at 4 and 10 °C. To determine whether oospores may survive under field conditions, agar plates with oospores were buried in soil in Prague‑Suchdol and Svitavy for seven months during the overwintering period (October–May) in 2011–2015. There were statistically significant differences in oospore viability examined by the plasmolysis test between the localities, and oospore viability ranged from 29 to 43 % and from 15 to 44 % in Prague‑Suchdol and Svitavy, respectively.

scholarly journals Changes in Meligethesaeneus (Coleoptera: Nitidulidae) susceptibility to lambda-cyhalothrin in the Czech Republic between 2009 and 2011

2016 ◽  
Vol 51 (No. 1) ◽  
pp. 13-32 ◽  
Author(s):  
M. Seidenglanz ◽  
J. Poslušná ◽  
J. Rotrekl ◽  
P. Kolařík ◽  
E. Hrudová ◽  
...  
Keyword(s):  
Czech Republic ◽  
The Czech Republic ◽  
Lambda Cyhalothrin

scholarly journals Biology and Yield of Rocket (Eruca sativa Mill.) under Field Conditions of the Czech Republic (Central Europe)

2013 ◽  
Vol 41 (2) ◽  
pp. 530 ◽  
Author(s):  
Ivana DOLEŽALOVÁ ◽  
Martin DUCHOSLAV ◽  
Karel DUŠEK
Keyword(s):  
Czech Republic ◽  
Central Europe ◽  
Leaf Shape ◽  
Field Conditions ◽  
Leaf Margin ◽  
Eruca Sativa ◽  
Marketable Yield ◽  
The Czech Republic ◽  
Growing Seasons ◽  
Cultivation Techniques

Five rocket (Eruca sativa (L.) Mill.) varieties and accessions were cultivated under field conditions in the Czech Republic (Central Europe) and subsequently studied for variation in morphology and yield. Two cultivation techniques (treatments) were tested during the growing seasons in 2010 and 2011: directly sown seeds in the field and plantlets cultivated in a glasshouse and later transplanted to the field. There were analysed four morphological parameters of the leaf rosette (leaf shape in outline, leaf margin, leaf apex and leaf colour), marketable yield, nonmarketable parts, and rosette radius. Plants from plantlets transplanted to the field in spring terms (April) yielded a substantially higher marketable yield and had a higher rosette radius in contrast to plants from directly sown seeds. Conversely, for the summer terms (late August, September) the direct sowing technique produced higher marketable yield in comparison with plantlets treatment. Plants cultivated from directly sowed seeds reached a marketable yield on average from 15 to 60 g per plant while transplanted plants produced on average from 10 to 49 g per plant. It is evident that cultivation of rocket under field conditions of the Czech Republic is possible and provides, when using the appropriate sowing term, more or less stable yields of marketable parts. Details on variation in yield parameters of individual varieties and accessions are presented.

scholarly journals Influence of application term on effectiveness of some insecticides against brassica pod midge (Dasineura brassicae Winn.)

2008 ◽  
Vol 43 (No. 2) ◽  
pp. 57-62 ◽  
Author(s):  
R. Pavela ◽  
J. Kazda ◽  
G. Herda
Keyword(s):  
Czech Republic ◽  
Oilseed Rape ◽  
Winter Oilseed Rape ◽  
The Czech Republic ◽  
Lambda Cyhalothrin ◽  
Full Flowering ◽  
Dasineura Brassicae

In 2005 we determined the effectiveness of two preparations against gall pod midge in dependence on different terms of application, i.e. at full flowering (BBCH 65) and after flowering (BBCH 67) of winter oilseed rape. The tests were carried out at three localities in the Czech Republic, and the two preparations used were Calypso 480 SC (a.i. thiacloprid) and Karate Zeon 5CS (a.i. lambda-cyhalothrin). It was found that applying the preparations at BBCH 67 was significantly more effective than treatment at BBCH 65.

Social variation in size at birth and preterm delivery in the Czech Republic and Sweden, 1989-91

1998 ◽  
Vol 12 (1) ◽  
pp. 7-24 ◽  
Author(s):  
Koupilova ◽  
Vagero ◽  
Leon ◽  
Pikhart ◽  
Prikazsky ◽  
...  
Keyword(s):  
Czech Republic ◽  
Preterm Delivery ◽  
The Czech Republic ◽  
Social Variation ◽  
Size At Birth
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