دراسة ديناميكية الفطريات المهلكة للديدان الثعبانية في تربة جنوب العراق

الملخص EN

A total of 308 soil samples were collected from different sites of southern (Basrah, Thi-Qar and Missan) provinces of Iraq, during the period of August 1995 and September 1996.

Twenty seven species of Nematophagous fungi (16 species of nematode-trapping fungi and 11 species of Endonematophagous fungi) were isolated during this study.

All recovery species were newly recorded in Iraq except four species.

183 isolates were isolated.

The results showed that the frequency of fungal species was varied according to the collecting sites.

The highest occurrence of fungal species was found in Basrah (43 %) followed by Missan (31.6 %) and the lowest occurrence was in Thi-Qar (25.4 %).

Meantime's, the number of isolates was also varied among the fungal species and collecting sites.

The species Monacrosporium eudermatum revealed highest frequency percentages reached 22.3 % followed by Arthrobotrys oligospora (13 %).

A.dactyloides, A.

oligospora, M.

eudermatum, Harposporium anguillulae were isolated from all the collecting sites, the rest species revealed large differentiation in their occurrences.

The results showed that the seasonal variation in the number and the type of isolated species.

The highest occurrence of species were found in the January, and the lowest occurrence showed in August .

The reasons for this variation may be due to the effect of environmental factors such as temperature and moisture of soil.

The dominance of fungal species was varied among the collecting sites.

Apparently that M.eudermatum was the most dominant species in the studied location reached 100 %, followed by Arthrobotrys oligospora.