BIOLOGY AND PATHOGENICITY OF THE YELLOW BEET CYST NEMATODE, A HOST RACE OF HETERODERA TRIFOLII ON SUGAR BEET IN THE NETHERLANDS BY P. W. TH. MAAS Plant Protection Service, 6700 HC Wageningen, The Netherlands and W. HEIJBROEK Institute of Sugar Beet Research, 4600 AA Bergen op Zoom, The Netherlands In 1975, dense populations of H. trifolii were found in fields where sugar beet had been grown on sandy soils in the southern part of the Netherlands. Host range of this yellow beet cyst nematode includes Cruciferae, Chenopodiaceae, Polygonaceae and Caryophyllaceae. In tests with Leguminosae, many juveniles invaded roots but reproduction occurred on a few species on- ly. In hatching tests, pot and field observations, H. trifolii preferred warmer temperatures and multiplied more at the optimum temperature (25°) than H. schachtii because of its parthenogenetic reproduction. In spring at suitable temperatures (over 15°), a large proportion (70%) of juveniles hatch from the cysts when no host plant is present and this can be increased to about 90% by treating cysts with picric acid or root leachate from oil-seed rape. Under suitable conditions more generations may develop in one season. In a field trial sugar beet, cabbage and broad bean
Nematologica – Brill
Published: Jan 1, 1982
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