Dataset DOI: 10.5061/dryad.stqjq2cfw

Description of the data and file structure

The forecast model SIMAGRIO-W utilises soil temperature and moisture data to predict the migration of Agriotes wireworms to the upper soil layer. The model distinguishes between two risk levels: low risk (less than 30% of the wireworm population in the upper soil layer) and high risk (more than 30%), which are considered adequate for practical purposes. In German field sites, the model demonstrated an 80% success rate across four soil types. We tested the SIMAGRIO-W model under the warm and dry climate in Eastern Austria.

Files and variables

File: Wireworm-Data_2013-2014(2).xlsx

Description: At three sites in Traiskirchen (Lower Austria; site 1) and Bruck/Leitha (Lower Austria; sites 2 and 3), wireworm activities in the upper 15 cm of the soil were measured with wireworm bait traps from the middle of July until the end of October 2013. A transect of 5 bait traps was installed within the top soil layer at each site. At sites 1 and 3, activity measurements were extended to spring 2014. In the last trapping period of 2013, control transects were installed at a distance of 10 m from the regular transects at sites 1, 2, and 4 (= control transect). From August 12 up to September 23, 2013, five additional traps were installed at site 1 at a distance of one meter from the regular transect (= additional transect). In contrast to the other traps, the additional traps were emptied every 7 days. Thus, we investigated whether the amount of wireworm catches was influenced by the duration of a trapping period since significantly shorter trapping periods were chosen when the model was developed and calibrated in Germany.

The headings are written in bold type.

Variables

• aust_mean: The mean number of A. ustulatus wireworms from five bait traps on the regular transect
• abrev_mean: The mean number of A. brevis wireworms from five bait traps on the regular transect
• atot_mean: The mean number of all Agriotes wireworms from five bait traps on the regular transect
• aust_sem: Standard error of the mean for A. ustulatus wireworms from five bait traps on the regular transect
• abrev_sem: Standard error of the mean for A. brevis wireworms from five bait traps on the regular transect
• atot_sem: Standard error of the mean for all Agriotes wireworms from five bait traps on the regular transect
• atot_day_trap: All Agriotes wireworms per day and per trap on the regular transect
• atot_pr: All Agriotes wireworms caught per day per trap compared as a percentage of the maximum catch at the site, which is assumed to be 100% of the population.
• atot_mean_control_transect: The mean number of all Agriotes wireworms from five bait traps on the control transect; Wireworm surveys were not carried out continuously on the control transects. On the dates when no wireworms were collected using bait traps, the cells were filled with 'n/a'.
• atot_sem_control_transect: Standard error of the mean for all Agriotes wireworms from five bait traps on the control transect; Wireworm surveys were not carried out continuously on the control transects. On the dates when no wireworms were collected using bait traps, the cells were filled with 'n/a'.
• atot_mean_add_transect: The mean number of all Agriotes wireworms from five bait traps on the additional transect; Wireworm surveys were not carried out continuously on the additional transects. On the dates when no wireworms were collected using bait traps, the cells were filled with 'n/a'.
• atot_sem_add_transect: Standard error of the mean for all Agriotes wireworms from five bait traps on the additional transect; Wireworm surveys were not carried out continuously on the additional transects. On the dates when no wireworms were collected using bait traps, the cells were filled with 'n/a'.

File: SIMAGRIO-W-Data_2013-2014.xlsx

Description: The measured values of soil temperature, soil moisture, and soil type were used to simulate the percentage of the Agriotes wireworm population in the top soil layer of each site by the use of SIMAGRIO-W Jung et al. (2012) for the sites Traiskirchen, Bruck A, and Bruck B. The daily calculated forecasts were averaged for each trapping period and afterwards compared with the measured activities. Jung et al. (2012) specified the validation threshold with a percentage of 30 % of the Agriotes population in the upper 15 cm of the soil. A value > 30 % was considered as high activity (i.e., high risk). A trapping period was considered a hit for the model if both the simulated and the measured values were higher or lower than the validation threshold. Only in trapping periods in which, at least for one day, wireworm activity was predicted to be higher than 10 % by the 1st model part, the predictions of the 2nd model part have been taken into account. Otherwise, an Agriotes activity less than or equal to 10 % was assumed. 

In a first step (i.e., 1st model part), daily average values of soil moisture (percentage by volume) and temperature are used to run a bivariate Gaussian regression for determining the percentage of the wireworm population, which is currently located in the upper 15 cm of the soil. For the first half of the year, moisture data in 15 cm soil depth, for the second half of the year, moisture data in 80 cm soil depth are used to carry out the calculation. In the event that the percentage of the wireworm population is below the 10 % threshold, the simulation will be stopped. If the value is equal to or larger than 10 %, the calculation passes over to the next step (i.e., 2nd model part), which determines the exact percentage of the population in the topsoil by using logistic regressions based on soil moisture and soil type. The calculation takes into account soil moisture as a percentage of field capacity.

The headings are written in bold type.

Variables

• temp 15cm-M: Temperature at 15cm soil depth
• moist 15cm-S: Moisture at 15cm soil depth
• SIMAGRIO-W (Tu3) 1st part-M: Result of the 1st part of the model; The data are written in bold type when the percentage of the wireworm population exceeds 10%.
• SIMAGRIO-W (Tu3) 2nd part-M: Result of the 2nd part of the model
• WW catches main transekt A. total (%): All *Agriotes *wireworms caught per day per trap on the main transect compared as a percentage of the maximum catch at the site, which is assumed to be 100% of the population.

Empty cells (n/a)

• On days when bait traps were buried or changed, no measurement or survey data were collected, and no wireworm catches were registered.
• The collection of weather data and wireworm surveys was interrupted when the trial sites were cultivated (Traiskirchen: 17–22 October 2013; Bruck A and Bruck B: 1 August 2013; Bruck B: 9–14 May 2014).
• The collection of weather data and wireworm surveys was suspended outside of the growing season (Traiskirchen: 7 November 2013 – 20 March 2014; Bruck B: 24 October 2013 – 15 April 2014).

Code/software

NA