THE RELATION BETWEEN RATE OF REPRODUCTION AND AVERAGE NUMBER OF EGGS PER CYST IN GLOBODERA ROSTOCHIENSIS AND G. PALLIDA BY J. W. SEINHORST Middelberglaan 6, Ede, The Netherlands Pooled rates of reproduction of Globodera rostochiensis (five pathotypes) and of G. pallida (three pathotypes) from several pot experiments in four years on potato cv. Irene at initial population densities of 1 egg and 5 eggs/g soil were, per nematode species, proportional to average number of eggs per cyst and per pot and, per initial egg density, not correlated with number of cysts produced per egg in the inoculum. This also applied to rates of reproduction of pathotype Ro 1 on cvs Bintje and Mentor in four field experiments at initially 1 egg/g soil. The average number of cysts produced per egg in an inoculum of 5 eggs/g soil by G. rostochiensis in pots was 1.7 times that produced by G. pallida. At initially I egg/g soil the ratio was 1.5. Numbers of cysts of G. rostochiensis pathotype Ro 1 produced per egg in an inoculum of 5 eggs/g soil were proportional to dry haulm weight per pot. At initially 1 egg/g soil pathotype Ro 1 produced more cysts per
Nematologica – Brill
Published: Jan 1, 1992
Keywords: eggs/cyst; correlations; pots and fields; Globodera rostochiensis; G. pallida; cysts/initial egg; reproduction rates
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