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The Effect of Globodera Pallida and G. Rostochiensis On Potato Yield

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The relationship between numbers of Globodera pallida and G. rostochiensis and yield of potato tubers (Solanum tuberosum L.) was investigated in 1981 in three microplot experiments. Both species greatly reduced tuber yields. Tolerance limits of 1.7 eggs of G. pallida/g soil at Bari and of 1.4 and 2.1 eggs of G. rostochiensis/g soil at Avezzano and Battipaglia, respectively, were derived by fitting curves to the data according to the equation y = m + (1-m) zP- T. Yields in microplots inoculated with 64 eggs/g soil were negligible and the tubers unmarketable. Values of m were 0.03, 0.05 and 0.13 respectively. G. pallida gave the highest maximum multiplication rate: 128 times. Maximum multiplication rates for G. rostochiensis were 58 and 65 times respectively at Avezzano and Battipaglia.

Affiliations: 1: Istituto di Nematologia Agraria, C.N.R., 70126 Bari; 2: Istituto Sperimentale per le Colture Industriali, M.A.F., 84091 Battipaglia (Salerno); 3: Ente Regionale di Sviluppo in Abruzzo, 67051 Avezzano (L'Aquila), Italy


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