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Table 1 Relative importance (%) of the main insect pests on annual and perennial crops in the humid forest zone of Southern – Cameroon.

From: Farmers' perception on the importance of variegated grasshopper (Zonocerus variegatus (L.)) in the agricultural production systems of the humid forest zone of Southern Cameroon

All
Crops AECD-Blocks Termites Borers Caterpillars (Without Borers) Aphids Mirids Scales Insects Variegated grasshopper Bugs (Without Mirids) p-value
Annual crops Yaounde 9 16 9 10 6 19 16 14 <0.001
  Mbalmayo 2 21 10 9 7 22 16 13 <0.0001
  Ebolowa 4 22 12 13 5 17 14 15 <0.0001
     p-value <0.05 NS NS NS NS NS NS NS  
     Mean 5 20 10 11 6 20 15 14 <0.0001
Young Perennial Crops Yaoundé 14 14 12 11 21 18 7 5 <0.01
  Mbalmayo 1 19 19 10 28 13 8 2 <0.0001
  Ebolowa 3 22 14 14 28 5 11 4 <0.0001
     p-value <0.001 NS NS NS NS <0.05 NS NS  
     Mean 6 18 15 11 25 12 9 4 <0.0001
Female
Annual crops Yaounde 11 16 9 13 9 19 12 14 NS
  Mbalmayo 3 21 10 12 9 22 12 13 0.0386
  Ebolowa 5 22 11 14 3 17 14 16 0.0236
     p-value NS NS NS NS NS NS NS NS  
     Mean 6 19 10 13 7 19 12 14 <0.0001
Young Perennial Crops Yaoundé 14 15 7 14 18 23 3 11 NS
  Mbalmayo 2 21 19 10 29 14 2 5 0.0005
  Ebolowa 4 21 15 15 22 7 13 4 NS
     p-value NS NS NS NS NS NS NS NS  
     Mean 7 19 14 13 23 15 6 6 <0.0001
Male
Annual crops Yaounde 7 17 10 8 3 20 21 15 0.0072
  Mbalmayo 2 21 10 7 6 23 20 13 0.0003
  Ebolowa 3 23 13 12 7 17 14 14 0.0002
     p-value NS NS NS NS NS NS NS NS  
     Mean 4 20 11 9 5 20 18 14 <0.0001
Young Perennial Crops Yaoundé 14 13 16 8 24 13 11 3 0.0404
  Mbalmayo 0 18 19 10 27 13 12 2 0.0007
  Ebolowa 3 24 13 12 33 2 10 4 0.0006
     p-value 0.008 NS NS NS NS NS NS NS  
     Mean 6 18 16 10 28 9 11 3 <0.0001
  1. The values are averages of the scores for 10 groups (5 male and 5 female groups) of farmers interviewed per block; p-value is the significance levels of a non parametric test of Kruskal-Wallis; NS = no significant (p > 0.05). AECD-Blocks = Agro-Ecological, Cultural and Demographic Blocks.