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Table 6 Perforation Index caused by C. maculatus in cowpea seeds treated with P. guineense powders

From: Perforation index assessment of cowpea seeds against cowpea bruchid, Callosobruchus maculatus (Fabricius) [Coleoptera: Chrysomelidae], infestation using Piper guineense

P. guineense extracts Conc. (%) Total no of seeds Number of damaged seeds % seed damaged % weight loss *Beetle Perforation Index (BPI)
P. guineense leaf 1 93.50 1.00 2.50 ± 0.02ab 5.00 ± 0.04b 5.50 ± 0.05b
P. guineense seeds 95.25 0.00 0.00 ± 0.00ab 0.00 ± 0.00a 0.00 ± 0.00a
Methanol (+ve control) 92.00 0.00 32.50 ± 2.25cd 40.00 ± 2.04c 75.00 ± 3.04c
P. guineense leaf 2 94.00 0.00 0.00 ± 0.00a 0.00 ± 0.00a 0.00 ± 0.00a
P. guineense seeds 94.02 0.00 0.00 ± 0.00a 0.00 ± 0.00a 0.00 ± 0.00a
Methanol (+ve control) 96.00 0.00 27.50 ± 2.50c 37.50 ± 2.50c 65.00 ± 3.04c
P. guineense leaf 3 95.00 0.00 0.00 ± 0.00a 0.00 ± 0.00a 0.00 ± 0.00a
P. guineense seeds 94.50 0.00 0.00 ± 0.00a 0.00 ± 0.00a 0.00 ± 0.00a
Methanol (+ve control) 93.00 0.00 25.00 ± 2.20c 35.00 ± 2.20c 60.00 ± 3.04c
Untreated (−ve control) 0.0 95.25 40.00 42.50 ± 3.75d 52.50 ± 3.20d >50.00 ± 0.00
  1. Each value is a mean ± standard error of four replicates. Means within the same column followed by the same letter are not significantly different at P > 0.05 using Tukey’s test
  2. * - Perforation Index
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