Cereal Research Communications
Volume/Issue:
Volume 39: Issue 2
Pherocon AM trapping and the “Whole plant count” method — A comparison of two sampling techniques to estimate the WCR adult densities in Central Europe
Authors: R. Bažok 1 , I. Sivčev 2 , T. Kos 1 , J. Igrc Barčić 3 , J. Kiss 4 , and S. Jankovič 5
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  • 1 University of Zagreb Faculty of Agriculture Šimunska 25 10000 Zagreb Croatia
  • 2 Institute for Plant Protection and Environment Beograd Serbia
  • 3 “Chromos-agro” d.d. Zagreb Croatia
  • 4 Szent István University Plant Protection Institute H-2100 Gödöllő Hungary
  • 5 Institute for Science Application in Agriculture Beograd Serbia
DOI:
https://doi.org/10.1556/crc.39.2011.2.14
Page Count:
298–305
Publication Date:
01 Jun 2011
Online Publication Date:
21 May 2011
Article Category:
Research Article
Restricted access

Pherocon AM (PhAM) trapping and visual counting are two commonly used methods for identifying maize fields in the USA that contain a sufficient number of adult western corn rootworms (WCR), Diabrotica virgifera virgifera LeConte to cause economic root damage by larvae the following year. Therefore, the estimation of adult WCR population plays an important role in management decisions (rotation or treatment). The goals of this study were (1) to compare adult WCR data obtained by PhAM trapping to “whole plant count” data in different maize developmental stages, (2) to determine the period in which the data obtained by both methods show the highest correlation, (3) to determine the regression curve between capture of WCR on PhAM as an independent variable and number of WCR observed by visual plant count, and (4) to determine if the “whole plant count” method can serve as a substitution for PhAM trapping under European conditions. Three samplings were conducted in 2006 in 38 fields in Croatia and one sampling was conducted in 22 fields in Serbia. Sampling in Croatia was conducted when maize plants were in the R 65-69, R 73-77 and R 79-85 developmental stages according to BBCH identification keys of maize. Sampling in Serbia was conducted when maize plants reached R 69-71 developmental stages. Three to six PhAM traps were placed in each 0.5 to 4 ha maize field seven days prior to sampling. Visual counts were conducted on the same day as trap inspections. Adult WCR densities in the PhAM traps were correlated to adult densities on whole plants. Statistical analyses comparing the results of PhAM trapping with the visual “whole plant count” method showed that there is a significant medium to strong correlation between them. Correlation coefficients varied depending on the data used in the analysis. When sampling was conducted in the first half of August (maize developmental stages R 69-77), the correlation coefficients were the highest (r(R 6971) = 0.8677 and r(R 73-77) = 0.706). Coefficients of determination were the highest as well [r2(R 69-71) = 0.753; r2(R 73-77) = 0.4984]. Therefore, the most appropriate period for sampling is during the first half of August. At that time, the majority of the maize plants were between the R 69 and R 77 developmental stages. According to the results, 0.5–1 visually determined adult/plant corresponds to 40 adults/trap/week. This shows that both methods are equally useful for estimating the population densities of WCR in the Central European region.

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Cover Cereal Research Communications
Cereal Research Communications A Quarterly of the Cereal Research Non-Profit Ltd. Company
Print ISSN:
0133-3720
Online ISSN:
1788-9170
Keywords:
correlations; Central Europe; sampling techniques; Pherocon AM traps; whole plant counts; western corn rootworm

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