THE RELATIONSHIPS BETWEEN PLANT PARASITIC NEMTODES OF SUGARBEET AND OTHER SOIL FAUNA ...

Abstract

The soil arthropod and nematode fauna and microorganisms groups associated with sugarbeet fields at the Ten-thousand faddans, West Nubaryia, were identified and surveyed. Also, the relationship among plant parasitic nematode, soil microorganisms and soil animals were studied. Results proved the follows:- Nematode fauna is constituted about 86. I 5 % of the total animal fauna. The plant parasitic nematode formed 68.75% of the total nematode fauna. Population of Meloidogyne incognita nematode progressively increased and reached its maximum value at I 80 days. This species also, was found in high occurrence rate and had the highest "Importance and Prominence values". The rest of the plant parasitic nematode species varied between them for the aforementioned values. Seven species of predacious soil mites were evaluated for their predacious activity; the highest predation rate on juvenile of M incognita was achieved by Cheyletus molaccensis. While, the mite species, Macrocheles monchaolska was ranked in the first in predation of both juvenile and egg-masses of M. incognita nematode.