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

250Table 3. Correlation matrix between leaf area infected (LAI) and individualpathogens in the HF of Cameroon in 1995–2004.LAI Et Rs Bm Sm PpLAI 1.00E. turcicum 0.21*** 1.00R. solani -0.40*** -0.04 1.00B. maydis -0.41*** -0.21** -0.15** 1.00S. macrospora 0.02** -0.03** -0.07 -0.06** 1.00P. polysora 0.25** 0.03 -0.03* 0.22* -0.14** 1.00Et= Exserohilum turcicum; Rs =Rhizoctonia solani; Bm =Bipolaris maydis;Sm= Stenocarpella macrospora; Pp = Puccinia polysoraE= Exserohilum; R= Rhizoctonia; B= Bipolaris; S= Stenocarpella; P= Puccinia*, **, ***Signifi cant F-test at 0.05, 0.01 and 0.001 levels of probability.Table 4.Correlation matrix between leaf area infected (LAI) and individualpathogens in the WHL zone of Cameroon, 1995–2004.LAI Et Rs Bm Sm Pp MVS P PsptLAI 1.00E. turcicum 0.08*** 1.00R. solani 0.26*** -0.06 1.00B. maydis 0.39*** -0.18** -0.04*** 1.00S. macrospora 0.12*** -0.03** 0.01* -0.15 1.00P. polysora 0.52*** -0.04 0.06*** -0.06 -0.13*** 1.00MSV 0.42*** 0.12** 0.08 0.11*** 0.11** 0.19*** 1.00Phy. maydis 0.03** -0.04 -0.02*** 0.06*** -0.09*** -0.04** -0.07** 1.00Pspt 0.28** -0.03** 0.06*** 0.09*** -0.05** 0.13 0.09*** 0.07** 1.0Et =Exserohilum turcicum; Rs =Rhizoctonia solani; Bm =Bipolaris maydis; Sm =Stenocarpella macrospora;Pp = Puccinia polysora; MSV= maize streak virus; Pspt =physiological spot.E= Exserohilum; R= Rhizoctonia; B= Bipolaris; S= StenocarpellaP= Puccinia; Phy= Physoderma*, **, ***Signifi cant at 0.05, 0.01 and 0.001 levels of probability.Table 5.Incidences* of individual maize pathogens in the WHL of Cameroon in1995–2004.Bali Njinikom Bamunka95 04 95 04 95 04 MeanE. turcicum 3.8 16.7 64.3 65.0 51.4 100.00 50.2C. zeae maydis 4.3 33.6 71.4 90.5 68.6 84.0 58.7Phy. maydis 0.0 27.8 0.0 27.8 0.0 33.00 14.8Stem disease 3.8 1.5 4.3 7.5 10.0 5.00 5.4Pha. maydis 0.0 33.3 1.6 3.6 0.0 33.00 11.9S. maydis 0.0 0.0 0.0 0.0 0.0 13.90 2.3*Mean incidence = total number of plants infected out of 180 plants per locationE= Exserohilum; C= Cercospora; Phy. = Physoderma; Pha. = Phaeosphaeria;S= Stenocarpella.