Survey and control of powdery scab (Spongospora subterenea) in potato growing areas of the Cordillera [Philippines]
1994
Khayad, T.A. | Perez, J.C. (Bureau of Plant Industry, Baguio City, 2600 (Philippines). Baguio National Crop Research and Development Center)
Potato fields in Benguet and Mt. Province [Philippines], 52.24 has and 49.00 has, respectively were surveyed in 1991-1993. Benguet had high percentage infection particularly in Calagan, Bugias, Paoay and Englandad in Atok with mean infection rating of powdery scab on tuber surface highest at 4.50 or 26-50 percent. Most affected are areas with elevations of 1900-2330 masl. Results further showed after 4 croppings, powdery scab pustules covering tuber surface was highest on potato planted continuously infected at 90-95 percent; potatoes planted after at 3-5 percent and potato after non-host crops at 6-10 percent. Further, soil treatment with fungicide significantly control powdery scab compared with tuber dipping and dusting. Among the 30 cultivars/clones tested under field conditions BW-5 showed highly significant resistance to powdery scab. Clone Yungay, Huaycha, Pacena, Poos-590 and G-5 were resistant under field conditions. Among the different cropping schemes tested, highest return of investment amounting to P168,340 was obtained in potato planted after 9 months. Monocropping gave negative income at least P86,000
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