Evaluation of highland-produced seed tubers of potato cv. Berolina
1993
Aromin, F.B. | Rasco, E.T. Jr. | Bautista, O.K. | Magtibay, P. | Sana, E.J. | dela Cruz, A.A. | Baniqued, C.A. | Mariano, J.S.
It was found that three of the four seedlots contained a high proportion of either undersized or oversized tubers. They also had a high incidence of tuber injuries and contained varietal mixtures which were beyond the limits set by BPI [Bureau of Plant Industry, Manila, Philippines]. Variation in seed size and varietal mixtures could be traced to differences in management practices during seed production. On the other hand, the high level of tuber injury which was observed in all seedlots can be attributed to improper harvesting and postharvest practices. After six weeks of storage in either location, almost all tubers had sprouted, but the sprouts had not yet reached the ideal size for planting. Seedlots with higher proportions of large sized tubers tended to sprout earlier and produced more and longer sprouts after six weeks of storage (WS). Cumulative weight loss (CWL) of tubers stored in Los Banos [Laguna, Philippines] ranged from 7-19% after 6 WS, about half of which on the average, was due to moisture loss. In Baguio, the CWL of tubers after 6 WS was slightly higher (12-23%) than that recorded in Los Banos. Moisture loss did not vary significantly among seedlots. However, total weight loss differences can be attributed to differences in disease load. Among the disease organisms identified in storage, bacterial wilt-causing organism (Pseudomonas solanacearum) was detected in all seedlots and was most dominant (3 to 10.1%), followed by Fusarium spp. which caused dry rot (0 to 8.7%), and Phoma exigua which caused gangrene (0 to 9.6%). Other pests observed were Phytophthora erythroseptica which caused pink rot, Erwinia spp. which is associated with blackleg and Phthorimaea operculella (potato tuber moth)
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