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Michael Traugott – One of the best experts on this subject based on the ideXlab platform.

  • ORIGINAL PAPER Occurrence of Agriotes wireworms in Austrian agricultural land
    , 2016
    Co-Authors: Karin Staudacher, Nikolaus Schallhart, Peter Pitterl, Bernhard Kromp, Johann Glauninger, Michael Traugott
    Abstract:

    are abundant soil-dwelling herbivores which can inflict considerable damage to field crops. In Europe up to 40 species occur, differing in their ecology and pest status. Their distribution in the larval stage, however, has rarely been assessed because of the considerable effort in collect-ing wireworms and the difficulties in identifying them to species-level. Here, we examined the occurrence of Agriotes wireworms in Austrian agricultural land with regard to their association with climatic and soil parameters. Using a molecular identification system, 1348 field-collected larvae from 85 sites were identified to species-level. Three species, Agriotes obscurus, Agriotes brevis, Agriotes ustulatus, and two that could not be discerned molecularly (Agriotes line-atus and Agriotes proximus), were assigned to two ecolog-ical groups: (i) A. brevis/A. ustulatus, found in areas with a warmer, drier climate and alkaline soils, and (ii) A. obscurus/ A. lineatus/proximus which occur mainly at higher altitude characterised by lower temperatures, higher precipitation and acidic, humus-rich soils. Agriotes sputator was abun-dant throughout Austria, confirming its euryoecious nature. Only one larva of Agriotes litigiosus was found, prohibiting further analysis. These data contribute to a characterisation of species-specific traits in Agriotes larvae in agricultural land, an important prerequisite to develop efficient control strategies for these wireworms

  • raw data Wallinger et al MER-12-0242
    , 2016
    Co-Authors: Corinna Wallinger, Karin Staudacher, Nikolaus Schallhart, Eva Peter, Phillipp Dresch, A Juen, Michael Traugott
    Abstract:

    Molecular detection rates of different Agriotes larvae feeding on different plant species – feeding experiments with fresh plants and decaying tissu

  • Appendix B. Densities of Agriotes larvae in maize rows and inter-crop strips in the three different cropping treatments in August and September 2009.
    , 2016
    Co-Authors: Karin Staudacher, Nikolaus Schallhart, Corinna Wallinger, Anita Juen, Bettina Thalinger, Michael Traugott
    Abstract:

    Densities of Agriotes larvae in maize rows and inter-crop strips in the three different cropping treatments in August and September 2009

Renata Bazok – One of the best experts on this subject based on the ideXlab platform.

  • linking climate change and insect pest distribution an example using Agriotes ustulatus shall coleoptera elateridae
    Agricultural and Forest Entomology, 2018
    Co-Authors: Maja Cacija, Antonela Kozina, Jasminka Igrc Barcic, Renata Bazok
    Abstract:

    Agriotes ustulatus (Schaller, 1873) (Coleoptera: Elateridae) is an economically important agricultural pest. Recently, changes in the distribution and abundance of this species in Croatia have been established. The present study aimed: (i) to determine the abundance and dominance of A. ustulatus in four regions in Croatia; (ii) to test the effect of temperature and rainfall on dominance and distribution; and (iii) to determine the flight activity of the A. ustulatus adults (peak and swarming period). From 2001 until 2010, five Agriotes species were captured by pheromone traps placed in 17 fields within four counties. Differences in air temperature and rainfall were determined between regions. The highest dominance of A. ustulatus was recorded in the warmest eastern county and the species was classified as eudominant. High dominance was also observed in the western county, confirming that A. ustulatus occurs in higher population in this area. Species was subdominant where the mean air temperature was the lowest. The increase in dominance in the west could be explained by the significant positive correlation found between air temperature and dominance. The seasonal activity of the adults was from June to mid-August, with peak flight at the end of June.

  • Climatic, Edaphic Factors and Cropping History Help Predict Click Beetle (Coleoptera: Elateridae) (Agriotes spp.) Abundance
    Journal of insect science (Online), 2015
    Co-Authors: Antonela Kozina, Darija Lemić, Renata Bazok, Katarina M. Mikac, Christopher M. Mclean, Marija Ivezić, J. Igrc Barcic
    Abstract:

    It is assumed that the abundance of Agriotes wireworms (Coleoptera: Elateridae) is affected by agro-ecological factors such as climatic and edaphic factors and the crop/previous crop grown at the sites investigated. The aim of this study, conducted in three different geographic counties in Croatia from 2007 to 2009, was to determine the factors that influence the abundance of adult click beetle of the species Agriotes brevis Cand., Agriotes lineatus (L.), Agriotes obscurus (L.), Agriotes sputator (L.), and Agriotes ustulatus Schall. The mean annual air temperature, total rainfall, percentage of coarse and fine sand, coarse and fine silt and clay, the soil pH, and humus were investigated as potential factors that may influence abundance. Adult click beetle emergence was monitored using sex pheromone traps (YATLORf and VARb3). Exploratory data analysis was preformed via regression tree models and regional differences in Agriotes species’ abundance were predicted based on the agro-ecological factors measured. It was found that the best overall predictor of A. brevis abundance was the previous crop grown. Conversely, the best predictor of A. lineatus abundance was the current crop being grown and the percentage of humus. The best predictor of A. obscurus abundance was soil pH in KCl. The best predictor of A. sputator abundance was rainfall. Finally, the best predictors of A. ustulatus abundance were soil pH in KCl and humus. These results may be useful in regional pest control programs or for predicting future outbreaks of these species.

  • Ecomorphological variation of the wireworm cephalic capsule: studying the interaction of environment and geometric shape.
    PloS one, 2014
    Co-Authors: Hugo A. Benítez, Antonela Kozina, Darija Lemić, Maja Čačija, Thomas A. Püschel, Renata Bazok
    Abstract:

    Studying the association between organismal morphology and environmental conditions has been very useful to test hypothesis regarding the influence of climate on shape. It has been long recognized that different environments produce dissimilar stress levels in insects, which can be reflected on the ability of an individual to overcome these pressures and spread further. Agriotes (Coleoptera: Elateridae) species infest agricultural fields in different parts of Croatia, inhabiting different climatic conditions. Previous biological studies have indicated that there is a relationship between some Agriotes biological parameters such as density and climatic conditions such as soil moisture and temperature. However, it is still unknown how these environmental properties influence the wireworm morphological structure. This is highly relevant because the head of this species is directly involved in the mobility in the soil, thus affecting the invasive capacity of this insect. Therefore the aim of this study was to assess the association between different climatic conditions and the morphological variation of Agriotes cephalic capsule. Advanced multivariate analysis and geometric morphometric tool were applied to study the covariation between shape and environmental variables. Partial Least Squares methods were used in order to analyse the association between the wireworm head shape and three different climatic conditions: soil type, temperature and rainfall. Our results showed that there is a high covariation between the wireworm head shape and the climatic conditions. It was suggested that the observed shape–environment association could be result of the high plasticity of this species in relation to its invasive capacity.

Antonela Kozina – One of the best experts on this subject based on the ideXlab platform.

  • linking climate change and insect pest distribution an example using Agriotes ustulatus shall coleoptera elateridae
    Agricultural and Forest Entomology, 2018
    Co-Authors: Maja Cacija, Antonela Kozina, Jasminka Igrc Barcic, Renata Bazok
    Abstract:

    Agriotes ustulatus (Schaller, 1873) (Coleoptera: Elateridae) is an economically important agricultural pest. Recently, changes in the distribution and abundance of this species in Croatia have been established. The present study aimed: (i) to determine the abundance and dominance of A. ustulatus in four regions in Croatia; (ii) to test the effect of temperature and rainfall on dominance and distribution; and (iii) to determine the flight activity of the A. ustulatus adults (peak and swarming period). From 2001 until 2010, five Agriotes species were captured by pheromone traps placed in 17 fields within four counties. Differences in air temperature and rainfall were determined between regions. The highest dominance of A. ustulatus was recorded in the warmest eastern county and the species was classified as eudominant. High dominance was also observed in the western county, confirming that A. ustulatus occurs in higher population in this area. Species was subdominant where the mean air temperature was the lowest. The increase in dominance in the west could be explained by the significant positive correlation found between air temperature and dominance. The seasonal activity of the adults was from June to mid-August, with peak flight at the end of June.

  • Ecomorphological Variation of the Wireworm Cephalic Capsule: Studying the Interaction of Environment and Geometric Shape
    , 2015
    Co-Authors: Hugo A. Benı́tez, Darija Lemic, Antonela Kozina
    Abstract:

    Studying the association between organismal morphology and environmental conditions has been very useful to test hypothesis regarding the influence of climate on shape. It has been long recognized that different environments produce dissimilar stress levels in insects, which can be reflected on the ability of an individual to overcome these pressures and spread further. Agriotes (Coleoptera: Elateridae) species infest agricultural fields in different parts of Croatia, inhabiting different climatic conditions. Previous biological studies have indicated that there is a relationship between some Agriotes biological parameters such as density and climatic conditions such as soil moisture and temperature. However, it is still unknown how these environmental properties influence the wireworm morphological structure. This is highly relevant because the head of this species is directly involved in the mobility in the soil, thus affecting the invasive capacity of this insect. Therefore the aim of this study was to assess the association between different climatic conditions and the morphological variation of Agriotes cephalic capsule. Advanced multivariate analysis and geometric morphometric tool were applied to study the covariation between shape and environmental variables. Partial Least Squares methods were used in order to analyse the association between the wireworm head shape and three different climatic conditions: soil type, temperature and rainfall. Our results showed that there is a high covariation between the wireworm head shape and the climatic conditions. It was suggested that the observed shape–environment association could be result of the hig

  • Climatic, Edaphic Factors and Cropping History Help Predict Click Beetle (Coleoptera: Elateridae) (Agriotes spp.) Abundance
    Journal of insect science (Online), 2015
    Co-Authors: Antonela Kozina, Darija Lemić, Renata Bazok, Katarina M. Mikac, Christopher M. Mclean, Marija Ivezić, J. Igrc Barcic
    Abstract:

    It is assumed that the abundance of Agriotes wireworms (Coleoptera: Elateridae) is affected by agro-ecological factors such as climatic and edaphic factors and the crop/previous crop grown at the sites investigated. The aim of this study, conducted in three different geographic counties in Croatia from 2007 to 2009, was to determine the factors that influence the abundance of adult click beetle of the species Agriotes brevis Cand., Agriotes lineatus (L.), Agriotes obscurus (L.), Agriotes sputator (L.), and Agriotes ustulatus Schall. The mean annual air temperature, total rainfall, percentage of coarse and fine sand, coarse and fine silt and clay, the soil pH, and humus were investigated as potential factors that may influence abundance. Adult click beetle emergence was monitored using sex pheromone traps (YATLORf and VARb3). Exploratory data analysis was preformed via regression tree models and regional differences in Agriotes species’ abundance were predicted based on the agro-ecological factors measured. It was found that the best overall predictor of A. brevis abundance was the previous crop grown. Conversely, the best predictor of A. lineatus abundance was the current crop being grown and the percentage of humus. The best predictor of A. obscurus abundance was soil pH in KCl. The best predictor of A. sputator abundance was rainfall. Finally, the best predictors of A. ustulatus abundance were soil pH in KCl and humus. These results may be useful in regional pest control programs or for predicting future outbreaks of these species.

Lorenzo Furlan – One of the best experts on this subject based on the ideXlab platform.

  • Female Responses to Synthetic Pheromone and Plant Compounds in Agriotes brevis Candeze (Coleoptera: Elateridae)
    Journal of Insect Behavior, 2018
    Co-Authors: József Vuts, Lorenzo Furlan, Miklos Toth
    Abstract:

    Traps baited with synthetic pheromone components of Agriotes brevis [geranyl butanoate + ( E,E )-farnesyl butanoate] captured significantly higher numbers of not only male, but also female beetles, compared to unbaited controls. Catches of both sexes showed a clear positive relationship with increasing doses. In electroantennogram tests, antennal responses of females and males to a number of known Agriotes pheromone components, identified from pheromone glands, showed a similar trend, with geranyl butanoate eliciting the strongest responses. This suggests that the female and male A. brevis antennae are similar with respect to the perception of pheromone compounds, and female beetles have the sensory capabilities to perceive the pheromone components which they produce. Addition of the plant-derived compounds ( Z )-3-hexenyl acetate, methyl benzoate, ( Z )-3-hexenol and methyl salisalicylate (identified earlier from foliage as attractive for A. brevis ) to the synthetic pheromone significantly increased catches. All the above results suggest that geranyl butanoate and ( E,E )-farnesyl butanoate are constituents of an aggregation pheromone of A. brevis , in contrast to the general view of click beetle pheromones being “classical” sex pheromones. These findings could be useful for more precise monitoring and forecasting of damage, based on female catches.

  • Development of a female attractant for the click beetle pest Agriotes brevis
    Pest management science, 2013
    Co-Authors: József Vuts, Lorenzo Furlan, Éva Bálintné Csonka, Christine M. Woodcock, John C. Caulfield, Patrick Mayon, John A. Pickett, Michael A. Birkett, Miklos Toth
    Abstract:

    BACKGROUND: Traps suitable for catching female Agriotes click beetles may provide better reconnaissance than pheromonebaited traps which catch only males, thereby contributing to more efficient crop protection. The basis for this study came from (i) observations of female Agriotes brevis (Candeze) aggregating beneath foliage of Medicago sativa (L.) and Lolium italicum (A. Br.) placed on plastic sheets on bare soil, and (ii) field tests demonstrating attraction of females to traps baited with foliage from these plants. The aim was to identify and field test volatile compounds from M.sativa and L.italicum leaves. RESULTS: A number of electrophysiologically active chemicals were identified from headspace extracts of M. sativa and L. italicum. Three different synthetic blends of the identified compounds, comprising four, seven and nine components, were field tested. The four- and nine-component blends caught more female A. brevis than unbaited traps, with the proportion of females not differing between blends. CONCLUSION: The plant-derived blends were shown to catch female A. brevis under field conditions when applied in traps. Of these, the four-component blend, given its relatively simple composition [(Z)-3-hexenyl acetate:methyl benzoate:(Z)-3-hexen1-ol:methyl salisalicylate 300:5:30:30 mg bait −1 ], may be a suitable ‘standard’ blend for bait optimisation. c � 2013 Society of Chemical Industry

  • Effect of male mass trapping of Agriotes species on wireworm abundance and potato tuber damage.
    Bulletin of Insectology, 2013
    Co-Authors: Muhammad Sufyan, Daniel Neuhoff, Lorenzo Furlan
    Abstract:

    The use of sex pheromones as an option to control wireworms via mass trapping and the biology of Agriotes lineatus (L.) were investigated in a long-term field experiment at an organic research farm in North Rhine-Westphalia, Germany. Plots supplied with sex pheromone traps were compared with untreated control plots. Over 5 years, a total of 12,378 male adults of A. lineatus, Agriotes obscurus (L.) and Agriotes sputator (L.) were captured in six traps located at 40 m distance in a grass-clover ley. The swarming period of the males lasted from late April to late August with one major and a small peak in the successive years for all three species. During 2006 and 2008 A. lineatus was the dominant species trapped with 4,005 male adults followed by A. obscurus (3,045) and A. sputator (1,213). The total number of wireworms captured over all sampling dates only slightly differed between the two pheromone treated plots (201 individuals) and the two control plots (230 individuals) suggesting no effect of mass trapping on wireworm abundance. The peak oviposition period of A. lineatus lasted from May to early June. Over a 30 month period the larvae passed through 8 instar stages (life cycle not completed) and attaining L4 instar stage before the first and L8 before the second overwintering. Non-chemical wireworm control will have to focus on cultural approaches including soil tillage and rotation design taking data on biology into account.

Miklos Toth – One of the best experts on this subject based on the ideXlab platform.

  • Female Responses to Synthetic Pheromone and Plant Compounds in Agriotes brevis Candeze (Coleoptera: Elateridae)
    Journal of Insect Behavior, 2018
    Co-Authors: József Vuts, Lorenzo Furlan, Miklos Toth
    Abstract:

    Traps baited with synthetic pheromone components of Agriotes brevis [geranyl butanoate + ( E,E )-farnesyl butanoate] captured significantly higher numbers of not only male, but also female beetles, compared to unbaited controls. Catches of both sexes showed a clear positive relationship with increasing doses. In electroantennogram tests, antennal responses of females and males to a number of known Agriotes pheromone components, identified from pheromone glands, showed a similar trend, with geranyl butanoate eliciting the strongest responses. This suggests that the female and male A. brevis antennae are similar with respect to the perception of pheromone compounds, and female beetles have the sensory capabilities to perceive the pheromone components which they produce. Addition of the plant-derived compounds ( Z )-3-hexenyl acetate, methyl benzoate, ( Z )-3-hexenol and methyl salicylate (identified earlier from foliage as attractive for A. brevis ) to the synthetic pheromone significantly increased catches. All the above results suggest that geranyl butanoate and ( E,E )-farnesyl butanoate are constituents of an aggregation pheromone of A. brevis , in contrast to the general view of click beetle pheromones being “classical” sex pheromones. These findings could be useful for more precise monitoring and forecasting of damage, based on female catches.

  • Development of a female attractant for the click beetle pest Agriotes brevis
    Pest management science, 2013
    Co-Authors: József Vuts, Lorenzo Furlan, Éva Bálintné Csonka, Christine M. Woodcock, John C. Caulfield, Patrick Mayon, John A. Pickett, Michael A. Birkett, Miklos Toth
    Abstract:

    BACKGROUND: Traps suitable for catching female Agriotes click beetles may provide better reconnaissance than pheromonebaited traps which catch only males, thereby contributing to more efficient crop protection. The basis for this study came from (i) observations of female Agriotes brevis (Candeze) aggregating beneath foliage of Medicago sativa (L.) and Lolium italicum (A. Br.) placed on plastic sheets on bare soil, and (ii) field tests demonstrating attraction of females to traps baited with foliage from these plants. The aim was to identify and field test volatile compounds from M.sativa and L.italicum leaves. RESULTS: A number of electrophysiologically active chemicals were identified from headspace extracts of M. sativa and L. italicum. Three different synthetic blends of the identified compounds, comprising four, seven and nine components, were field tested. The four- and nine-component blends caught more female A. brevis than unbaited traps, with the proportion of females not differing between blends. CONCLUSION: The plant-derived blends were shown to catch female A. brevis under field conditions when applied in traps. Of these, the four-component blend, given its relatively simple composition [(Z)-3-hexenyl acetate:methyl benzoate:(Z)-3-hexen1-ol:methyl salicylate 300:5:30:30 mg bait −1 ], may be a suitable ‘standard’ blend for bait optimisation. c � 2013 Society of Chemical Industry

  • New sex attractant composition for the click beetle Agriotes proximus: similarity to the pheromone of Agriotes lineatus.
    Journal of chemical ecology, 2007
    Co-Authors: Miklos Toth, József Vuts, Lorenzo Furlan, Mitko Subchev, Teodora B. Toshova, István Szarukán, Amália Xavier, Venyamin G. Yatsynin
    Abstract:

    While testing traps baited with a blend of geranyl octanoate and geranyl butanoate (pheromone components previously identified for Agriotes lineatus, Coleoptera, Elateridae) in Portugal and Bulgaria, large numbers of the closely related Agriotes proximus were captured. In the literature, two different compounds, (E,E)-farnesyl acetate and neryl isovalerate had previously been identified as pheromone components of A. proximus. Subsequent field tests, conducted in several European countries, revealed that A. proximus was weakly attracted to geranyl butanoate on its own, while A. lineatus was weakly attracted to geranyl octanoate on its own. However, the largest catches for both species were observed with a blend of both compounds. No A. proximus was caught in traps baited with the blend of (E,E)-farnesyl acetate and neryl isovalerate at any of the test sites. In electroantennographic studies, antennae of male A. proximus and A. lineatus both gave greater responses to geranyl butanoate than to geranyl octanoate, suggesting that the perception of these two compounds was similar for both species. A 1:1 blend of geranyl octanoate and geranyl butanoate can be used as a bait in traps for the detection and monitoring of both A. lineatus and A. proximus in many European countries.