scholarly journals Cabbage stem flea beetle’s (Psylliodes chrysocephala L.) susceptibility to pyrethroids and tolerance to thiacloprid in the Czech Republic

2019 ◽  
Author(s):  
Jitka Stará ◽  
František Kocourek
Keyword(s):  
Czech Republic ◽  
Flea Beetle ◽  
Pest Species ◽  
Feeding Experiment ◽  
Winter Oilseed Rape ◽  
The Czech Republic ◽  
Glass Vial ◽  
Major Pest ◽  
Psylliodes Chrysocephala ◽  
Lc50 And Lc90

AbstractThe cabbage stem flea beetle (CSFB), Psylliodes chrysocephala (Coleoptera: Chrysomelidae), has recently become a major pest species in winter oilseed rape in the Czech Republic. The susceptibility of CSFB populations from two localities to six pyrethroids, two neonicotinoids, one organophosphate and one oxadiazine was evaluated in 2015-2018 in glass vial experiments. The susceptibility of CSFB to thiacloprid and thiamethoxam was evaluated in feeding experiment in 2017 and 2018. High susceptibility of CSFB populations to lambda-cyhalothrin, cypermethrin, esfenvalerate, tau-fluvalinate, etofenprox, deltamethrin, chlorpyrifos, indoxacarb and acetamiprid was observed in the glass vial experiments. The LC50 and LC90 data obtained for pyrethroids in these experiments in 2015 represent baseline for CSFB resistance monitoring to pyrethroids in the Czech Republic. High tolerance of CSFB to thiacloprid of CSFB was demonstrated in glass vial and the feeding experiment, too.

scholarly journals Influence of selected fungicides registered in the Czech Republic for winter oilseed rape on in vitro Sclerotinia sclerotiorum mycelial growth

2018 ◽  
Vol 54 (No. 2) ◽  
pp. 101-110 ◽  
Author(s):  
Poslušná Jana ◽  
Plachká Eva ◽  
Mazáková Jana
Keyword(s):  
Czech Republic ◽  
Oilseed Rape ◽  
Sclerotinia Sclerotiorum ◽  
Mycelial Growth ◽  
Winter Oilseed Rape ◽  
Baseline Sensitivity ◽  
The Czech Republic ◽  
Dose Rates ◽  
The Mean

The baseline sensitivity of 55 isolates of Sclerotinia sclerotiorum, collected from oilseed rape in 6 regions of the Czech Republic, to selected fungicides was determined during the period 2013–2015. One single-component fungicide – Horizon (tebuconazole), and four multicomponent fungicides – Pictor (boscalid, dimoxystrobin), Efilor (boscalid, metconazole), Prosaro 250 EC (prothioconazole, tebuconazole), and Propulse (fluopyram, prothioconazole), were chosen as these are commonly used locally. The effect of each fungicide on the in vitro pathogen radial mycelial growth and EC<sub>50 </sub>values for the respective fungicides were determined. The following MIC values were estimated; for the fungicides Horizon 250 EW, Efilor, and Propulse the mean MIC values ranged between 0.125 and 0.250 µl/ml, for Prosaro 250 EC ranged between 0.0625 and 0.125 µl/ml, and for Pictor ranged from 0.00781 to 0.01562 µl/ml. No strains of S. sclerotiorum resistant to the tested fungicides were detected and the growth of all isolates was fully inhibited at concentrations corresponding to their registered dose rates. The highest fungicidal efficacy on the collected S. sclerotiorum isolates was recorded for Pictor, followed by Prosaro 250 with an EC<sub>50</sub> value 0.05856 µl/ml and then the remaining fungicides Propulse, Efilor, and Horizon 250 EW (EC<sub>50</sub> values 0.07277, 0.07221, and 0.08519 µl/ml, respectively).

EFFECT OF POST-TREATMENT TEMPERATURE ON THE CONTACT TOXICITY OF CYPERMETHRIN SPRAY TO ADULTS OF THE FLEA BEETLE, PHYLLOTRETA CRUCIFERAE (GOEZE)

1986 ◽  
Vol 118 (1) ◽  
pp. 79-80
Author(s):  
L. Burgess ◽  
C.F. Hinks
Keyword(s):  
Flea Beetle ◽  
Treatment Temperature ◽  
Synthetic Pyrethroid ◽  
Post Treatment ◽  
Contact Toxicity ◽  
Pest Species ◽  
Phyllotreta Cruciferae ◽  
Flea Beetles ◽  
Major Pest ◽  
Adult Flea

In 1982, the synthetic pyrethroid, cypermethrin, was among the insecticides recommended as a spray for control of adult flea beetles attacking canola crops in Saskatchewan (Saskatchewan Agriculture 1982). Growers reported some problems with its effectiveness at the recommended rates of 14–20 g AI/ha, however, and the recommendation for its use against flea beetles was subsequently discontinued. Laboratory spray trials were begun in 1982 to determine if post-treatment temperature affected the contact toxicity of cypermethrin to adults of the major pest species, Phyllotreta cruciferae (Goeze), and if the dosage that had been recommended was adequate as a contact spray.

scholarly journals Plodia interpunctella (Hübner, 1813) and Nemapogon granellus (Linnaeus, 1758) – Uncommon Pests on Stored Garlic (Allium sativum L.) in the Czech Republic

2017 ◽  
Vol 65 (4) ◽  
pp. 1167-1173
Author(s):  
Eva Hrudová ◽  
Ivana Šafránková
Keyword(s):  
Czech Republic ◽  
Allium Sativum ◽  
Plodia Interpunctella ◽  
Pest Species ◽  
Stored Products ◽  
The Czech Republic ◽  
Aceria Tulipae ◽  
Lepidoptera Pyralidae ◽  
Ditylenchus Dipsaci ◽  
The One

Garlic is one of several important vegetable species grown in the Czech Republic. Ditylenchus dipsaci (Kühn, 1857) (Tylenchida: Anguinidae), Aceria tulipae (Keifer, 1938) (Acari: Eriophyidae), Rhizoglyphus echinopus (Fumouze & Robin, 1868) (Acari: Acaridae) and R. robinii Claparède, 1869 (Acari: Acaridae), Suillia lurida (Meigen, 1830) (Diptera: Heleomyzidae) are common pest species found on garlic plants in the Czech Republic. Nowadays Aceria tulipae (Keifer, 1938) is beginning to be considered as the one causing damage. Plodia interpunctella (Hübner, 1813) (Lepidoptera: Pyralidae) and Nemapogon granellus (Linnaeus, 1758) (Lepidoptera: Tineidae) are small moths which are common pests usually found on stored products. Both of these species larvae were found as the uncommon pests of stored garlic in the Czech Republic in January 2016. Until now, their harmfulness on stored garlic has been reported only from Central America.

scholarly journals Detecting Pathogens of Verticillium Wilt in Winter Oilseed Rape Using ELISA and PCR – Comparison of the Two Methods and With Visual Stand Evaluation

2017 ◽  
Vol 65 (1) ◽  
pp. 205-210 ◽  
Author(s):  
Tomáš Spitzer ◽  
Pavel Matušinsky
Keyword(s):  
Czech Republic ◽  
Oilseed Rape ◽  
Verticillium Wilt ◽  
Evaluation Methods ◽  
Winter Oilseed Rape ◽  
Visual Evaluation ◽  
The Czech Republic ◽  
Verticillium Longisporum ◽  
Main Species ◽  
Match Rate

During 2013–2015, oilseed rape samples from various locations in the Czech Republic were analysed for the presence of Verticillium wilt. Samples were evaluated in the lab using ELISA and PCR as well as by visual evaluation during the samples collection. A comparison of detection match in individual methods also was made. ELISA and PCR matched in detecting Verticillium wilt in 60 % of cases. For practical use, a higher match rate would be necessary in cases where samples were to be analysed in various laboratories using only one of these techniques. The possibility was demonstrated to use kits as well as primers not targeted specifically to just Verticillium longisporum but recording both main species on oilseed rape (V. longisporum and V. dahliae). The match rates of lab analyses with visual evaluation of stand infection were surprisingly high at 62 % for ELISA and 77 % for PCR. All three stand evaluation methods matched in 56 % of cases.

scholarly journals Meteorological Variables That Affect the Beginning of Flowering of the Winter Oilseed Rape in the Czech Republic

Atmosphere ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1444
Author(s):  
Lenka Hájková ◽  
Martin Možný ◽  
Veronika Oušková ◽  
Lenka Bartošová ◽  
Petra Dížková ◽  
...  
Keyword(s):  
Czech Republic ◽  
Brassica Napus ◽  
Oilseed Rape ◽  
Air Temperature ◽  
Meteorological Variables ◽  
Base Temperature ◽  
Winter Oilseed Rape ◽  
Climatic Zones ◽  
The Czech Republic ◽  
Beginning Of Flowering

Winter oilseed rape (Brassica napus) is one of the most cultivated oilseeds in the Czech Republic and belongs among major pollen allergens. Pollen allergies have an extensive clinical impact worldwide, and as well as in the Czech Republic. In this paper, meteorological variables such as mean air temperature, maximum and minimum air temperature, precipitation total and number of rainy days in the period 1991–2012 were studied using the PhenoClim phenological model to find the best predictor of the beginning of flowering of the Brassica napus in the Czech Republic. In addition, temporal and spatial evaluations of the beginning of flowering of the Brassica napus were examined at individual stations in different climatic zones within the same period. In total, three phenological stations at altitudes from 270 m asl to 533 m asl located in warm (W2), medium warm (MW7) or cold (C7) climatic zones were used for detailed evaluation. Based on the observation results at selected stations, the beginning of flowering of the Brassica napus advanced progressively in timing (nearly −15 days) in the 1991–2012 period. The base temperature and temperature sums were calculated for the beginning of flowering of the winter oilseed rape using the PhenoClim computer tool. As the most accurate predictor for the beginning of flowering of the Brassica napus, the mean air temperature was determined. The optimal start day for calculation was 30th January, the threshold (base temperature) was 6.0 °C and the temperature sum was 157.0 °C. The RMSE value was 4.77 and the MBE value was −3.00. The simulated data had a good correlation with the real observed data (the correlation coefficients were within the range from 0.56 to 0.76), and the PhenoClim model results indicate using them in the forecast modeling of the beginning of flowering of the Brassica napus in the Czech Republic.

scholarly journals Phenology of cabbage stem flea beetle (Psylliodes chrysocephala L.) in oilseed rape

2016 ◽  
Vol 31 (3-4) ◽  
pp. 139-144
Author(s):  
Lazar Sivcev ◽  
Draga Graora ◽  
Ivan Sivcev ◽  
Vladimir Tomic ◽  
Boris Dudic
Keyword(s):  
Oilseed Rape ◽  
Growth Stage ◽  
Flea Beetle ◽  
Winter Oilseed Rape ◽  
Trap Crop ◽  
Important Pest ◽  
Psylliodes Chrysocephala ◽  
New Generation ◽  
Conventional Field

The cabbage stem flea beetle (Psylliodes chrysocephala (L.) is an important pest of winter oilseed rape in Serbia. Beetles colonize oilseed rape in early October and are active in the field until first frost and wintertime. In autumn, adults can be seen laying eggs in the soil around plants. Larvae of P. chrysocephala developed intensively on leaf petioles in November, reaching their highest numbers at the end of the month. No infested plants were found in a conventional field, while 14.5% of all dissected leaf petioles were infested on an integrated field. On unprotected plants in an organic field, 76.0% of the plants were infested with larvae at the growth-stage BBCH 18-19, with 31.1% infested leaves on average. As a results, the number of plants was reduced by 51%, i.e. from 43.0/m2 recorded in the autumn to 22.0/m2 in the following spring. A new generation of P. chrysocephala beetles emerged from the soil in the first half of June and rapidly escaped the fields from almost dry plants. Our results showed that a part of the population stayed in aestivation and emerged in the following crop during the next season. On the following 5 March, 0.5 beetles/m2 were found in emergence cages in the organic field, while 0.81beetles/m2 were found in the former trap crop.

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