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Damage To Carrots By Rotylenchus Uniformis, With a Discussion On the Cause of Increase of Tolerance During the Development of the Plant

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The tolerance of carrot to attack by Rotylenchus uniformis (Thorne) was about the same at 12° and at 17° to 22°. It increased with increase of the age of the plants, so that tolerance limits (T), estimated by fitting curves according to the equation y = m + (1 - m) z P-T (eq. (1)) to the data increased to the threefold value between 4 to 5 weeks after sowing and the end of the experiments (6 to 9 weeks later). Observations on the increase of leaf length suggested that nematode attack reduced the rate of growth of the plants only during a limited period which was probably longer with higher nematode density. Models based on this assumption and on a retardation of the growth of the plants by nematode attack were developed. The observations on growth and ultimate weights of the plants including those in experiments by Seinhorst & Kuniyasu (1969) were in good accordance with these models. Increase in root density during the development of the plants is considered the cause of the increase in tolerance. Because it is faster at low than at higher nematode densities it causes a deviation from proportionality at low nematode density, of the relation between nematode density and reduction of plant weight, which is expressed in eq. (1) by the use of the term z P-T.

Affiliations: 1: Institute of Phytopathological Research, Wageningen, the Netherlands; 2: Institute of Ecology, Warsaw, Poland


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