Evaluation of Kenyan finger millet accessions for Blast disease and Striga weed

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Presented by Mathews M.Dida (Maseno University) at the First Bio-Innovate Regional Scientific Conference, Addis Ababa, Ethiopia, 25-27 February 2013

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Evaluation of Kenyan finger millet accessions for Blast disease and Striga weed

  1. 1. Evaluation of Kenyan Finger milletaccessions for Blast disease and Striga weed Prof. Mathews M.Dida Department of Applied Plant Sciences School Of Agriculture & Food Security Maseno University, KenyaFirst Bio-Innovate Regional Scientific ConferenceUnited Nations Conference Centre (UNCC-ECA)Addis Ababa, Ethiopia, 25-27 February 2013
  2. 2. Importance of finger millet (E.coracana) Nutritious cereal in eastern Africa. Rich in amino acids and minerals. Excellent storage qualities.
  3. 3. Major Constraints to finger millet productionBlast disease Striga weed LodgingDrought
  4. 4. Objectives of studyTo evaluate response of diverse finger milletlines/accessions for Blast disease and Strigahermonthica in western Kenya, andTo identify genotypes with best agronomictraits for breeding
  5. 5. Materials and Methods 80 finger millet lines were evaluated for blast andother agronomic characters at Maseno Universityfarm long rains (LR) season of 201280finger millet lines were evaluated for Strigaresponse in a Striga-sick farm in Ragengni in Siayain LR Season of 2012 Experimental designs were Randomized CompleteBlocks with 2 replicates of single 3 m long plots.All experiments were done under natural disease orweed pressure.
  6. 6. Striga weed in experimental plots at Ragengni
  7. 7. Blast experiment:Maseno SiteData collected;seed yield per plot, blast severity and lodging (on scalesof 1-5), plant height, days to 50 percent flowering andthreshing percentageStriga experiment: Ragengni SiteData collected;seed yield per plot, plant height, days to 50 percentflowering.Striga weed damage ratings were visually taken on a scaleof 1 to 5 at 60 and 80 days after planting.
  8. 8. Results and DiscussionSummary of results of phenotype screening at Masenofor top 20 percent of lines based on seed yield Days to Blast Lodging Grain Plt Rank Entry flow severity score yield (g) height Threshing % 1 105 71 1.8 1 670 111.9 0.76 2 146 69 1.4 2 620 115.6 0.81 3 47 74 1.0 2.8 610 118.1 0.81 4 102 74 1.4 2 600 116.5 0.75 5 113 75 1.1 2 582.5 117.9 0.81 6 125 68 2.2 2.3 545 118.6 0.80 7 119 75 1.4 1.3 45 115.3 0.81 8 90 76 1.3 2.2 530 123.3 0.75 9 61 80 1.2 3.5 530 141.2 0.67 10 55 73 2.0 3 515 133.3 0.79 11 150 77 1.5 3.8 505 125.2 0.75 12 94 82 1.1 1.3 505 136.3 0.77 13 124 75 1.4 1.3 505 121 0.71 14 71 66 1.7 1 495 110 0.77 15 80 79 1.6 2 485 139.2 0.75 16 5 76 1.6 1.9 485 124.1 0.73 Mean 75.4 1.80 2.31 396.56 121.99 0.72 LSD 6.37 0.8 1.42 190.69 20.14 0.09 CV (%) 4.24 22.23 30.86 24.16 8.29 6.29
  9. 9. Results & Discussion Cont,• Genotypes score ranges• Blast Severity 1-3.7• Days to flowering 61-84• Lodging score 1-4.8• Threshing % 0.38-0.83• 75 % of lines scored 2 or less for head blast• Lodging was prevalent and serious at Maseno.• Some tall and semi dwarf finger millet lines were resistant to lodging.
  10. 10. Summary of results of Striga screening at Ragengni for top 20 percent of lines based on seed yield Striga Grain ratings Days to Yield at 60 Striga ratings Mean Striga Rank ENTRY fower (g/plot) days at 80 days Ratings 1 82 72 445 2.5 1.8 2.1 2 146 71 405 1.9 1.5 1.7 3 149 63 360 1.0 2.3 1.6 4 119 74 295 3.1 2.7 2.9 5 97 72 285 1.5 2.5 2.0 6 148 70 285 1.9 2.7 2.3 7 150 80 275 2.8 1.9 2.4 8 144 63 265 1.0 2.7 1.8 9 5 78 250 2.8 2.5 2.6 10 102 70 245 1.5 1.8 1.6 11 121 73 235 2.7 2.4 2.5 12 94 80 230 1.5 2 1.8 13 147 71 230 2.7 2.7 2.7 14 96 79 225 2.9 3 3.0 15 106 79 225 2.7 2.4 2.5 16 108 74 222.5 2.7 2.5 2.6 Mean 75.4 162.7 2.8 2.7 2.8 LSD 6.4 122.6 1.1 0.9 0.9 CV 4.2 37.8 20.4 16.5 15.5
  11. 11. CONCLUSIONS1. Finger millet genotypes 2. Lodging resistant were with the best blast (a).Semi dwarf lines (90- severity rating of 1 115 cm) were; • Entries 23,71,105 & 141,Entries 45 and 47 namely; the IE 2431, IE 3534,IE GBK033368 or IE 2412 & 2437and GBK033370 or WhiteSel6,respectively. IE 2555 (b). Tall lines (>120 cm) Entries 68,81,100 & 131 namely; IE 2441, IE3520,IE 2485,IE2393,respectively.
  12. 12. CONCLUSIONS CONT.3. Entries 102 (IE2396, 146 (Gulu E) and 149 (White Sel6 x IE2035) were resistant to Striga weed and had severity rating of 1.6 or 1.74. The lowest grain yielders were susceptible and had severity ratings of 4.These were entries nos.16, 22, 101, 113 & 141; IE Gulu-E 2377, IE 2459, IE 2427, IE 2567 &White Sel6, respectively.
  13. 13. RecommendationsFurther Study1. Estimates of yield losses in finger millet due Striga weed infestation should be made under farmer’s fields using bigger plots.2. Mechanisms of Striga weed resistance in finger millet should be determined.3. The mechanisms of lodging resistance in tall finger millet lines should be determined.Outputs4. The identified blast, lodging and Striga resistant genotypes should be disseminated to farmers or be deployed in breeding programs.
  14. 14. Acknowledgements• Maseno University• Job Otieno, Field Assistant• Jonathan Achuongo and Julius Ndenda, Field Attendants• Elly K Onde, Owner of Striga sick farm• This research was funded by Sida through Bio-Innovate Africa

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