Table 3 Reasons for the increase incidence of Zonocerus variegatus in crop fields in 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 |