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SOME FACTORS AFFECTING THE NUMBER AND SIZE OF NEMATODES IN POPULATIONS OF APHELENCHUS AVENAE BY A. A. F. EVANS *) and J. M. FISHER Waite Agricultural Research Institute, Adelaide, South Australia 5064 Individuals and populations of Aphelenchus avenae were affected by the temperatures at which they developed, the host on which they fed and the nutrition which the host received. The optimum temperature for reproduction was 30°C. Average length of adults was related to population numbers at higher temperatures, but at 30° total volume of nematodes decreased while numbers did not decrease significantly. A. avenae utilised some hosts more efficiently than others. In synonymizing all the known species of the genus Aphelenchus under A. avenae Bastian, 1865, Goodey ( 1963) drew attention to the need for close and detailed study of various populations of Aphelenchus to assess their variability. All isolates studied so far have proved easy to culture, multiplying rapidly on a wide range of fungi but little information is available on how the populations are affected by environmental factors. This paper reports the effects of tempera- ture, host and host nutrition on number and size of nematodes in populations of an isolate of A. avenae. MATERIALS
Nematologica – Brill
Published: Jan 1, 1970
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