ABACA Activities in the Philippines - Unido

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Ref. No. CFC/FIGHF/09 CFC/UNIDO/FIDA 48 Table 12. Mosaic infection versus yield loss (Albay) Variety Potential yield (kg/Ha/yr)* Computed yield (kg/Ha/yr) Lausigon Abuab Musa tex 51 Inosa Laguis Linawaan Tangongon Maguindanao 1,803 1,723 2,084 1,320 1,075 1,270 1,590 2,100 630.13 436.88 353.94 634.40 572.75 539.89 654.20 639.21 1 Results of several agronomic trials using the specified varieties. Mosaic incidence (%) 31.54 18.42 21.19 40.57 21.92 19.59 34.57 26.82 2 Data taken 30 MAP Yield loss (%) 65.05 74.64 82.57 50.05 46.72 59.10 58.85 69.56 Table 13. Mosaic infection versus yield loss (Leyte) Variety Potential yield (kg/Ha/yr)* Computed yield (kg/Ha/yr) Mosaic incidence (%) Yield loss (%) Lausigon Abuab Musa tex 51 Inosa Laguis Linawaan Tangongon Maguindanao 1,803 1,723 2,084 1,320 1,075 1,270 1,590 2,100 174.6 243.0 140.4 571.2 372.2 845.9 667.8 288.3 41.7 37.4 45.0 23.3 18.3 38.0 30.0 41.6 90.3 85.9 93.3 56.7 65.4 33.4 86.3 58.0 1 Results of several agronomic trials using the specified varieties. 2 Data taken 31 MAP For the abaca varieties grown in Leyte, computation of yield loss due to mosaic infection showed Linawaan, Inosa and Laguis having 33.4% to 65.4%. Though the three varieties were indigenous in the location, resistance to the disease was relatively low (Table 13). High mosaic infection in the six (6) varieties planted in Davao resulted to a complete loss in experimental plants thus unable to get matured plants that will yield the fiber. This phenomenon could be a result of a virulent strain of abaca mosaic and bract mosaic viruses which caused the disease. Not even the Mindanao varieties were able to withstand the inoculum pressure, although Tangongon which had 65.48% infection was the least affected among the varieties (Table 14). Table 14. Bunchy-top infection versus yield loss (Davao) Variety Potential yield (kg/Ha/yr) 1 Computed yield (kg/Ha/yr) Musa tex 51 2,084 252.8 Inosa 1,320 523.6 Laguis 1,075 440.0 Linawaan 1,270 564.8 Tangongon 1,500 380.8 Maguindanao 2,100 723.2 Bunchy-top Yield loss (%) incidence (%) 2 38.57 17.83 16.78 13.94 27.57 16.43 87.87 58.8 59.07 57.21 76.05 65.56
Ref. No. CFC/FIGHF/09 CFC/UNIDO/FIDA 49 1 Results of several agronomic trials using the specified varieties. 2 Data taken 27 MAP Table 15. Mosaic infection versus yield loss (Davao) Variety Potential yield (kg/Ha/yr) 1 Computed yield (kg/Ha/yr) Musa tex 51 Inosa Laguis 2,084 1,320 1,075 No fiber yield since all the varieties succumbed to Mosaic incidence (%) 2 Yield loss (%) 86.36 77.01 77.15 100% yield loss since no harvestable stalk remained. Disease Linawaan Tangongon Maguindanao 1,270 1,500 2,100 the disease. 78.40 65.48 84.42 incidence was high even at an early stage of growth (14MAP) 1 Results of several agronomic trials using the specified varieties. 2 Data taken 14 MAP 5. Conclusion and Recommendations There was no extensive field screening of indigenous abaca varieties/strain that had been conducted to determine their resistance to the viral diseases. The activities undertaken in this project resulted to assessment of field reactions of varieties to the bunchy-top and mosaic infection which were the basis for their selection to be adopted/recommended to the farmers. The abaca varieties which possessed relative degree of resistance were identified either to be planted in specific location or be adapted in other abacagrowing areas. For instance, the Abuab variety which is a Bicol variety can be planted in the Visayas since it possesses degree of resistance to mosaic both in Bicol and Leyte. It is also true for other varieties such as Laguis, Linawaan, Inosa and Maguindanao. The regresssion and correlation analysis which supported the symptomatology method of disease assessment had validated the reactions of the varieties to the two viral diseases of great importance. Although, yield loss estimates can also be useful in measuring the degree of resistance, this was not considered in the selection index, but utilized in correlating the disease incidence as a predictor of yield loss. It was also a known fact that agro-climatic conditions are contributory factors to yield loss. The following varieties with resistance to mosaic which can be recommended for commercial planting are as follows: Region V- Abuab, Linawaan, Musa Tex 51 Region VIII – Laguis, Abuab and Inosa Region XI - Tangongon, Inosa and Laguis While those varieties with resistance to bunchy-top which can be recommended for commercial planting are: Region V - Maguindanao, Inosa, Musa Tex 51 Region XI – Maguindanao, Laguis and Linawaan
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ABACA Activities in the Philippines - Unido

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