النيماتودا المصاحبة لبعض النباتات غير المحصولية في محافظة عنيزة في وسط المملكة العربية السعودية

Abstract EN

A survey to record the genera or species of plant nematodes associated with pastures, forest trees, weeds and ornamantals, which are growing inside or near the fields in onayzah governorate, was carried out during the period from January 1996 till february 1997.

the studied region was divided into four areas, and a total of 119 samples were collected from the rhizosphere and from plants.

nematodes were extracted, examined and identified to genus or species.

population density, frequency, and prominence value (pv) were calculated for each nematode.

results showed that eight genera of plant nematodes were associated with eight pasture plants, eight genera with five forest trees, ten genera with seven ornamantal plants, and 15 genera with 14 different weed plants.

both tylenchorhynchus and ditylenchus recorded the highest frequency of association with pasture plants, tylenchorhynchus with forest trees and ornamantal plants, and aphelenchus with weeds.

tylenchorhynchus recorded the heighest prominence value on pastures, helicotylechus on forest trees and ornamantals, but subanguina radicicola was the most prominent on weeds.