ABACA Activities in the Philippines - Unido

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Ref. No. CFC/FIGHF/09 CFC/UNIDO/FIDA 46 Screening trial in Leyte showed that varieties Laguis, Inosa and Tangongon were least affected by mosaic infection recorded as 18.3%, 23.3% and 30%, respectively. The result was in correlation with their reaction to the disease based on infection rate, incubation period and AUDPC (Fig 15). Fig 15. Disease progress curve for mosaic infection in abaca varieties grown in Leyte. In Davao, Tangongon was least affected by the disease having 65.48% followed by Inosa (77.01%) and Laguis (77.15%) among the varieties which succumbed to the disease at a much earlier period (14MAP). The highest percent mosaic infection was exhibited by Musa Tex 51 at 86.36% as well as the biggest AUDPC (Fig 16). Fig 16. Disease progress curve for mosaic infection in abaca varieties grown in Davao. Results of the ANOVA for the varieties screened in Albay showed that infection rate, incubation period and AUDPC significantly contributed to the incidence of the mosaic infection based on the result of regression analysis. The computed coefficient of determination (r 2 ) also indicated 81.93%, 65.49% and 63.83% contribution of the factors which affected disease incidence in Albay , Leyte and Davao (Table 9).
Ref. No. CFC/FIGHF/09 CFC/UNIDO/FIDA 47 Table 9 . Regression statistics for the factors involved in the development of mosaic diseases in selected abaca varieties planted in Albay, Leyte and Davao Parameter estimates Albay Leyte Davao Multiple R 0.9052 0.80927 0.7989 R square 0.8193 0.65492 0.6383 Intercept -13.6544 -12.8776 44.8567 Incubation period 0.1306 0.2589 -0.3411 Infection rate 330.7603 246.8405 33.5568 AUDPC 0.0051 0.0823 0.05868 Observations 31 31 24 Table 10. Selection of varieties for degree of resistance to mosaic diseases in Albay, Leyte and Davao based on the computed Y disease incidence. Variety Albay Leyte Davao Lausigon 30.8962 (6) 35.2844 (6) Abuab 17.2462 (1) 28.8193 (2) MT51 20.5395 (3) 50.4519 (8) 85.3640 (6) Inosa 34.7080 (7) 30.7355 (3) 75.2018 (2) Laguis 27.7080 (5) 20.9717 (1) 75.6789 (3) Linawaan 17.9872 (2) 33.1844 (4) 79.4187 (5) Tangongon 35.7445 (8) 33.9737 (5) 70.5298 (1) Maguindanao 26.5756 (4) 41.8678 (70 79.2397 (4) %YL = Yield of healthy plants (fiber yield in agronomic trial) – yield of diseased plants/ Yield of healthy plants x 100 Among the varieties grown in Albay, the least yield loss due to bunchy-top was obtained by Laguis having 48.15% , followed by Linawaan and Musa Tex having 52.3% and 57.06%, respectively(Table 11). For the mosaic infection, varieties Laguis, Inosa and Tangongon ranked first, second and third having 48.15%, 50.05% and 58.85%, respectively (Table 12). Table 11. Bunchy-top infection versus yield loss (Albay) Variety Potential yield (kg/Ha/yr) 1 Computed yield (kg/Ha/yr) Lausigon 1,803 242.16 Abuab 1,723 538.88 Musa tex 51 2,084 819.84 Inosa 1,320 509.17 Laguis 1,075 557.36 Linawaan 1,270 629.69 Tangongon 1,590 541.13 Maguindanao 2,100 729.88 1 Results of several agronomic trials using the specified varieties. Bunchy-top Yield loss (%) incidence (%) 2 42.93 30.00 29.18 24.01 44.06 31.55 43.94 20.06 2 Data taken 30 MAP 86.57 68.72 57.06 59.91 48.15 52.30 65.97 62.14
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