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Application of a sequential sampling technique to DIY assessment of leatherjacket ( Diptera: Tipulidae ) populations in grassland
Author(s) -
BLACKSHAW R. P.
Publication year - 1990
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1990.tb01948.x
Subject(s) - sampling (signal processing) , statistics , sequential sampling , grassland , range (aeronautics) , environmental science , sampling design , sample (material) , population , mathematics , computer science , ecology , biology , engineering , spatial distribution , chemistry , demography , filter (signal processing) , chromatography , sociology , computer vision , aerospace engineering
The use of brine in plastic pipes inserted into the ground is now an established technique for sampling leatherjackets in grassland. Three sequential sampling plans were compared with a standard twelve‐pipe sample for the probability of a recommendation to spray and the number of sample units necessary before a decision over a range of population densities. Data derived from field studies showed a good fit with the expected outcomes. All four plan models were applied to leatherjacket distribution data from Northern Ireland, This shows the number of samples required before a decision was reduced with sequential sampling and that the use of single sequential samples would increase the risk of error. The results are discussed in the context of the physical limitations of the brine sampling procedure and it is concluded that a sequential scheme based upon groups of four pipes would reduce average sampling time by 36% without increasing error.