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AbstractThe reproductive fitness of three Pratylenchus coffeae populations (Honduras,Ghana and Vietnam) and three Radopholus similis populations (Costa Rica,Cuba and Ghana) on carrot disks was studied as a function of time andinoculum densities. In the first study, the reproductive fitness of theisolates was followed during 11 weeks for P. coffeae and during 7 weeks forR. similis. All the populations increased with time. No distinction could befound in the maximum growth rate of the Pratylenchus populations. The R.similis population from Cuba had a higher maximum growth rate than thosefrom Ghana and Costa Rica. All the Radopholus populations showed a fastermultiplication than P. coffeae. In the second study, the influence of theinoculum density on the reproductive fitness was determined for the sixpopulations. The differences in reproduction ratios confirmed the results ofthe first study. Effetde la duree et du taux d'inoculum sur la reproductionde trois populations de Pratylenchus coffeae et de Radopholus similis elevessur rondelles de carottes - La reproduction de trois populations dePratylenchus coffeae (Honduras, Ghana et Vietnam) et de trois populations deRadopholus similis (Costa Rica, Cuba et Ghana) a ete etudiee en elevages surrondelles de carottes. Dans une premiere etude, la multiplication du P.coffeae a ete etudiee pendant 11 semaines et celle du R. similis pendant 7semaines. Toutes les populations se sont accrues avec le temps. Aucunedifference dans la vitesse de croissance maximale n'a ete observee entre lesdifferentes populations de Pratylenchus. La population de R. similisprovenant de Cuba a montre une vitesse de croissance plus elevee par rapportaux autres populations. Tous les isolats du R. similis ont montre unemultiplication plus rapide que celle des isolats du P. coffeae. Dans ladeuxieme etude, l'effet du taux d'inoculum sur la reproduction a etedetermine. Les differences dans les taux de reproduction observees ontconfirme les resultats obtenus dans la premiere etude.
Nematology – Brill
Published: Jan 1, 1999
Keywords: BANANA; MULTIPLICATION RATE; ROOT LESION NEMATODE; BURROWING NEMATODE; BIOLOGICAL DIVERSITY
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