Efficiency of variable-intensity and sequential sampling for insect control decisions in cole crops in the Netherlands |
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Authors: | A M Shelton J Theunissen and C W Hoy |
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Institution: | (1) Department of Entomology, New York State Agricultural Experiment Station, 14456 Geneva, NY, USA;(2) Research Institute for Plant Protection (IPO-DLO), P. O. Box 9060, 6700 Wageningen, GW, The Netherlands;(3) Dept. of Entomology, The Ohio State University, Ohio Agricultural Research and Development Center, 44691 Wooster, OH, USA |
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Abstract: | A total of 24 commercial fields of cabbages and Brussels sprouts were sampled in a grid fashion with 20–25 equally spaced
cells with four plants per cell. Using this data base of 80–100 plants, we conducted computer stimulations to compare the
treatment decisions that would be made for the major insect pests using published sequential sampling programs and a newly
developed variable-intensity sampling program. Additionally, we compared the number of samples required to make the decision.
At low thresholds (10–20%) for both Lepidoptera and cabbage aphids, variable intensity-sampling required a smaller sample
size and provided more reliable decisions, while at high thresholds (40–50%) sequential sampling provided more reliable decisions.
In both procedures, the occurrence of incorrect decisions was minimal. The number of cases in which a decision would not be
reached after a 40-plant sample was lower for variable-intensity sampling. Considering the number of samples required to make
a correct decision and the greater need for reliable decisions at lower thresholds, variable-intensity sampling was superior
to sequential sampling. Additionally, variable-intensity sampling has the advantage of requiring samples to be taken in a
greater area of the field and thus increases the probability of detecting localized infestations. Although variable-intensity
sampling was not designed to classify pest populations for treatment decisions but rather to achieve sampling precision around
the population mean, our present studies indicate that it can also be an effective method to aid in treatment decisions. |
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Keywords: | insecta Brassica oleracea cabbage economic threshold sampling |
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