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The influence of management practice on the spatial distribution of Lepidopteran pests in Brassica crops in the Democratic People's Republic of Korea: implications for sequential sampling plans
Author(s) -
Waters Edward Kyle,
Hamilton Andrew John,
Hepworth Graham,
Kim H. J.,
Pak W. S.,
Furlong Michael John
Publication year - 2009
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/s10144-008-0136-y
Subject(s) - pieris rapae , integrated pest management , pest analysis , biology , population , brassica , plutella , distribution (mathematics) , toxicology , agronomy , ecology , botany , lepidoptera genitalia , mathematics , mathematical analysis , demography , sociology
Plutella xylostella and Pieris rapae are the key components of a pest complex that attacks Brassica crops in the Democratic People's Republic of Korea (DPRK). We examined the spatial distributions of these insects within crops both as individual species and when combined as a standard insect that was derived from their relative feeding rates. The influence of standard co‐operative management practice and an integrated pest management (IPM) strategy on the dispersion of the standard insect was tested. Iwao's m* − m relation was then used to describe the distribution of standard insects by management categories and of Pieris rapae using all data. Pest management practices only affected the distribution of the species when they were combined into standard insects. Enumerative sampling plans were therefore designed for standard insects based on population data derived from IPM‐managed fields and for Pieris rapae from population data from all experimental fields. The presented plans have the potential to make a significant contribution to managing lepidopteran pests in the DPRK. The approach will be useful in the design of sequential sampling plans for other geographical regions where these pests co‐occur and can also contribute to the development of sequential sampling plans for other pest complexes for which standard insects can be derived.