Author: A.E. ISMAIL AND W.M.A. EL-NAGDI
Publishing Date: 2005
Volume 23 Issue 1
Studies on seasonal fluctuations of the most dominating plant parasitic and other nematode species associated with the rhizosphere of both jasmine and Christmas trees throughout a year indicated negative and positive correlations between the prevailing soil temperatures and the population densities of Helicotylenchus exallus, Meloidogyne incognita, Rotylenchulus reniformis and Trichodorus sp., onjasmine and Ditylenchus sp., Helicotylenchus sp., M. incognita, Pratrylenchus sp., R. reniformis, Tylenchorhynchussp., and Tylenchus sp., on Christmas trees. The population densities of H. exallus, M. incognita andTrichodorus sp., associated with jasmine attained two peaks in both soil and roots, however, the population densities of R. reniformis attained three times of peaks in soil and one peak only in root. As for the population densities of Helicotylenchus sp., M. incognita, Pratylenchus sp., and Tylenchorhynchus sp., associated with Christmas trees showed two distinguishable peaks, but the population densities of Ditylenchus sp., R. reniformis and Tylenchus sp. attained peaks three time in a year.