English - McKnight Foundation Collaborative Crop Research Program

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McKnight Foundation Collaborative Crops Research Project No: 06-741 Results and discussions: Generally weather condition was not very good for the crop, because rains started late and erratic. Dodoma suffered the most for all the crops and this affected the crop establishment and Alectra infestation. The trial at Hombolo was mistakenly planted at a site where almost there was no Alectra infestation, only few Alectra plants were observed on susceptible cowpea checks Vuli-2 and Fahari. Looking at the susceptible checks high infestation of Alectra was observed at Bihawana Training Centre followed by Ismani. From the test cowpea materials only cowpea line IT97K-499-38 and B301 supported zero Alectra counts at both locations Ismani and Bihawana (Table 3.1). Other lines supported very low Alectra plants as compared to the susceptible checks Vuli-2 and Fahari. 4 2009 Fig. 1 Cowpea field highly infested by Alectra at Bihawana Farmers training Centre Dodoma, 2009 Cowpea yield on average was observed highest at Hombolo followed by Bihawana FC and last was at Ismani. From the test cowpea lines, line IT99K-573-2-1 produced the highest average yield (735.6kg/ha) across sites followed by line IT97K-819-118 (647.3kg/ha). These lines also gave the highest yield from the test cowpea lines in 2008 season (Project Annual report 2008). Test line TZA 263 was severely infected with a bacterial disease called bacterial blight especially at Ismani and Hombolo; in some of the plots almost all plants died due to the disease Fig. 2 Cowpea line TZA 263 attacked by a bacterial disease likely to be Bacterial blight (Xanthomonas vignicola)
McKnight Foundation Collaborative Crops Research Project No: 06-741 Table 1.Average Infestation of cowpea entries with Alectra vogelii (Alectra count/3x4m) at three locations at 12 weeks after planting 2009: Cowpea Entries Ismani Bihawana FC Hombolo Mean Alectra count across 5 sites Comments IT99K-7-21-2-2 0.0 3.8 0.0 1.3 Late emergence of Alectra IT99K-573-2-1 0.0 1.8 0.0 0.6 Late emergence of Alectra IT97K-499-8 0.0 0.5 0.0 0.2 IT97K-818-35 0.0 1.0 0.0 0.3 IT97K-819-118 0.0 4.5 0.0 1.5 IT97K-499-38 0.0 0.0 0.0 0.0 IT89KD-288 0.0 26.3 0.0 8.8 IT00K-1207 0.8 1.8 0.0 0.9 IT96D-733 0.0 42.0 0.0 14.0 B301 0.0 0.0 0.0 0.0 TZA 263 0.0 1.5 0.0 0.5 Farmers selected for large grain Vuli 2 3.0 48.3 0.3 17.2 Commercial released varieties Fahari 7.5 34.3 1.0 14.3 Commercial released varieties Mean 0.87 12.73 0.15 SE 0.41 2.98 - Range: 0-16 0-74 0-3 Table 2: Yield (kg/ha) of cowpea entries at Alectra vogelii hot spot at three locations, 2009 Cowpea Entries Ismani Bihawana Hombolo mean yield Comments FC across sites IT99K-7-21-2-2 372.8 527.1 568.7 489.6 Farmers selected for earliness IT99K-573-2-1 309.4 927.1 970.4 735.6 Farmers selected for yield IT97K-499-8 410.2 643.7 753.9 602.6 IT97K-818-35 432.3 525.0 608.2 521.8 IT97K-819-118 590.8 677.1 674.0 647.3 IT97K-499-38 362.5 409.6 604.2 458.8 IT89KD-288 413.9 639.6 773.5 609.0 IT00K-1207 262.9 545.8 515.2 441.3 IT96D-733 404.6 302.1 514.3 407.0 B301 164.8 952.1 789.2 635.4 TZA 263 265.6 525.0 386.6 392.4 Large grain but severely infected by Bacterial blight disease. Vuli 2 212.7 354.1 867.3 478.0 Fahari 209.8 554.2 745.6 503.2 Mean 331.70 583.24 674.68 SE 29.44 35.15 27.86 Range: 92.5- 108.3- 236.6- 791.7 1542.0 1198.0 1.3.3a: On-farm evaluation of cowpea lines for Alectra resistance and yield: 2009
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English - McKnight Foundation Collaborative Crop Research Program

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