Studies on black scurf of potato caused by Rhizoctonia solani Khun : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science at Massey University

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Massey University
The potato, Solanum tuberosum L. is second only to wheat in importance as a food crop in New Zealand. During the last five years the total area of potatoes grown has fluctuated between 8,000 and 10,000 hectares, and the yield has increased steadily to over 25 tonnes per hectare (Table I). Table I Potato production in New Zealand. Area and production for several recent seasons*. Season Area (ha) Total Yield (tonnes) Yield (tonnes/ha) 1966-67 8,020 187,267 23.35 1967-68 9,517 235,831 24.78 1968-69 10,132 256,263 25.32 1969-70 9,928 253,263 25.51** 1970-71 7,689 (est.) * New Zealand Official Year Book, 1972. (Yield figures converted to metric equivalents). **= 10.15 tons/acre Although potatoes are grown in all parts of New Zealand, the bulk of the market is supplied from three areas. The Pukekohe district supplies the early markets from September to December and also substantial quantities of mid-season and main-crop potatoes. The February to July market is supplied principally from the Manawatu-Rangitikei district, and winter supplies (May to November) are drawn mainly from Canterbury, Otago and Southland (Claridge, 1972; Baxter, 1972). [FROM PREFACE]
Potato diseases and pests, Fungal diseases of plants, Rhizoctonia solani, Soil fungi