Validation of Fixed Sample Size Plans for Monitoring Lepidopteran Pests of Brassica oleracea Crops in North Korea

Hamilton, AJ, Waters, EK, Kim, HJ, Pak, WS and Furlong, MJ (2009) Validation of Fixed Sample Size Plans for Monitoring Lepidopteran Pests of Brassica oleracea Crops in North Korea. Journal of Economic Entomology, 102 3: 1336-1343. doi:10.1603/029.102.0361


Author Hamilton, AJ
Waters, EK
Kim, HJ
Pak, WS
Furlong, MJ
Title Validation of Fixed Sample Size Plans for Monitoring Lepidopteran Pests of Brassica oleracea Crops in North Korea
Formatted title
Validation of Fixed Sample Size Plans for Monitoring Lepidopteran Pests of Brassica oleracea Crops in North Korea
Journal name Journal of Economic Entomology   Check publisher's open access policy
ISSN 0022-0493
Publication date 2009-06
Year available 2009
Sub-type Article (original research)
DOI 10.1603/029.102.0361
Volume 102
Issue 3
Start page 1336
End page 1343
Total pages 8
Editor John T. Trumble
Alan Kahan
Place of publication USA
Publisher Entomological Society of America
Collection year 2010
Language eng
Subject C1
070603 Horticultural Crop Protection (Pests, Diseases and Weeds)
8202 Horticultural Crops
Formatted abstract
The combined action of two lepidoteran pests, Plutella xylostella L. (Plutellidae) and Pieris rapae L. (Pieridae), causes significant yield losses in cabbage (Brassica oleracea variety capitata) crops in the Democratic People's Republic of Korea. Integrated pest management (IPM) strategies for these cropping systems are in their infancy, and sampling plans have not yet been developed. We used statistical resampling to assess the performance of fixed sample size plans (ranging from 10 to 50 plants). First, the precision (D = SE/mean) of the plans in estimating the population mean was assessed. There was substantial variation in achieved D for all sample sizes, and sample sizes of at least 20 and 45 plants were required to achieve the acceptable precision level of D ≤ 0.3 at least 50 and 75% of the time, respectively. Second, the performance of the plans in classifying the population density relative to an economic threshold (ET) was assessed. To account for the different damage potentials of the two species the ETs were defined in terms of standard insects (SIs), where 1 SI = 1 P. rapae = 5 P. xylostella larvae. The plans were implemented using different economic thresholds (ETs) for the three growth stages of the crop: precupping (1 SI/plant), cupping (0.5 SI/plant), and heading (4 SI/plant). Improvement in the classification certainty with increasing sample sizes could be seen through the increasing steepness of operating characteristic curves. Rather than prescribe a particular plan, we suggest that the results of these analyses be used to inform practitioners of the relative merits of the different sample sizes.
Keyword crop monitoring
PLUTELLA-XYLOSTELLA LEPIDOPTERA
imported cabbageworm
pest complex
precision
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Thu, 03 Sep 2009, 08:02:06 EST by Mr Andrew Martlew on behalf of School of Biological Sciences