Par inoculation de plantes de riz, croissant sur un substrat contenant du Na235S04, on obtient des juvéniles marqués &d'Heterodera oryzae et &d'Heterodera sacchari. Par inoculation de mélanges de juvéniles non marques et de juvéniles marques, identifies ultérieurement par autoradiographie, on montre que les juvéniles &d'H. sacchari ont un pouvoir infestant supérieur àcelui des juveniles &d'H. oryzae, et que les juvéniles &d'H. oryzae issus de masses &d'ceufs et les juvéniles &d'H. oryzae issus de kystes ont un pouvoir infestant identique.
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