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Table 2 Sample methods to detect Paropsisterna beata with 95 % confidence at a design prevalence of 1 or 5 % within zones A, B and C

From: Eradication of Paropsisterna beata (Newman) (Coleoptera: Chrysomelidae) in a semi-rural suburb in New Zealand

Sample method

Sample sensitivity (%)

Zone A sample sizea (P b = 0.05)

Zone B sample size (P = 0.01)

Zone C sample size (P = 0.05)

Felling

90

1

2

Bark and litter inspection

80

359

Climbing or EPV

50

109

114

Visual inspection from ground

10

10

49

Total trees sampled

120

359

165

Number of eucalypt trees within the zone

192

2730

714

  1. aNumber of trees
  2. b P is design prevalence