Demand-Driven Technologies for Sustainable Maize ... - IITA

319Table 2. Abundance of maize stem and cob borer species on maizevariety CMS 9015 intercropped with cowpea variety BR1 inNyom II and Bafia, Cameroon, in 1999 and 2000.LocalityNyom IIBafiaTreatmentMaize treated with insecticide 317(28)**Maize-cowpea intercrop 393(35)Control420(37)Total1130Maize treated with insecticide 149(51)Maize-cowpea intercrop 67(23)Control74(26)Borer species*B.f. S.c. E.s. M.n. Total3(33)6(67)93(10)8(27)19(630 0 0 3170 1(100)001(25)1(25)2(50)03974261 11400 1540 76094Total*B.f.= Busseola fusca; S.c.=Sesamia calamistis; E.s.=Eldana saccharina; M.n.= Mussidianigrivenella. ** Figures in parentheses are percentages for a given species.Table 3. Grain yield and borer infestation and tunneling on maizeintercropped with cowpea in comparison with maize treatedwith Carbofuran in Nyom II and Bafia, Cameroon in 1999.LocalityNyom IIBafi aPlantingdate31 Aug.199914 Sep.199931 Aug.1999Treatmenthad higher infestation, may then be considered as the optimum plantingdate for maize in Nyom II when the objective is to have maximumnatural borer infestation. The results also showed that borer infestationin maize was higher in Nyom II than in Bafi a (Table 3).29030Parameters measuredInfestation, % Tunneling,%40324Yieldtha -1Maize treated with 52.5±27.5a* 0±0a 5.4binsecticideMaize-cowpea 71.0 ± 1.3b 10.2±1.4ab 3.4aintercropControl 82.5 ± 7.5b 20.0±9.6b 3.9aMaize treated with 51.3± 11.3a 2.4 ± 1.6a 2.6ainsecticideMaize-cowpea 67.5 ± 2.5b 3.0 ± 0.5a 2.7aintercropControl 72.5 ± 2.5c 6.7 ± 1.7a 1.9aMaize treated with 38.5 ± 1.5a 4.0 ± 2.4a 2.9ainsecticideMaize-cowpea 48.5 ± 1.5ab 9.5 ± 1.2a 2.4aintercropControl 58.5 ± 21.5b 8.5 ± 1.6a 2.6a*Means followed by the same letter within a column are not signifi cantly different at the0.05 level of probability.