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Table 3 Reasons for the increase incidence of Zonocerus variegatus in crop fields 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 Female Male
Reasons Ydé Mbyo Ebwa Means Ydé Mbyo Ebwa Means Ydé Mbyo Ebwa Means
Increased surfaces of herbaceous and C. odorata fallows 50 90 80 73 40 80 80 67 60 100 80 80
Deforestation 60 60 60 60 40 60 60 53 80 60 60 67
High reproductive rate of Z. variegatus 20 80 20 40 0 80 0 27 40 80 40 53
Lack, suppression or reduction of control measures against Z. variegatus 30 20 20 23 20 0 0 7 40 40 40 40
Increased food host range of Z. variegatus 40 20 10 23 60 20 0 27 20 20 20 20
Absence, suppression or reduction of human consumption of Z. variegatus 10 10 10 10 0 0 0 0 20 20 20 20
Wide colonization of the fields by weeds 10 0 10 7 0 0 0 0 20 0 20 13
Increase sun shine levels 10 20 10 13 0 20 20 13 20 20 0 7
Favorable climatic conditions 0 20 30 17 0 20 40 20 0 20 20 13
Change of the crop types 10 0 0 3 20 0 0 7 20 0 0 7
Reduction of spaces in sugar cane crop 10 0 10 7 20 0 0 7 0 0 20 7
Climatic changes 20 20 30 23 0 20 20 13 40 20 20 27
Presence of cassava 0 10 0 3 0 0 0 0 0 20 0 7
Possible change of the species of Z. variegatus 10 0 0 3 20 0 0 7 0 0 0 0
  1. The values (% of answer) are averages for 10 groups of farmers (5 male and 5 female groups) interviewed per block. AECD-Blocks = Agro-Ecological, Cultural and Demographic Blocks. Ydé : Yaoundé, Mbyo: Mbalmayo, Ebwa: Ebolowa.