حساسية بعض أنواع الأخشاب العصارية المحلية و المدخلة للإصابة الفطرية في ضوء تغير الوزن النوعي و نسب المكونات الكيميائية للأخشاب

Abstract EN

The study was carried out at the laboratories of the collage of Agriculture \ University of Kirkuk in 2013-2014 season for the purpose of testing the extent of the resistance of some types of local & Non local Tree Sapwood to the fungal infection (Aspergillus niger , Rhizopus stolonifer and Penicillium oxalicum) .

The loss in the Specific Grafity ( SG ) of the seven forest tree Sapwood adopted as an indicator of the infection extent and also relied on the ratios of Chemical component for the fixation of fungal growth on woods .

The result showed that the Specific Grafity of the Sapwood for ( Pinus brutia , Pinus eldarica , Quercus agelops , Quercus infectoria , Salix acmophylla , Melia azadirachta and Acer cineracens ) were ( 0.420, 0.434, 0.682, 0.618, 0.455, 0.482, 0.651) resbectivly before the fungal infection .

These values has decreased because they were influenced by all the factors studied , which were ( wood type and Fungis ).

The results also apeared that wood types of trees which containing a high percentage of extracts showed good resistance to fungal infection , the lowest value of loosing in Specific Gravity was in Pinus brutis ( 0.072 ) and the largest value in the Quercus agilops (0.190) .

However, all fungal types has an effected on Specific Gravity for the Sapwood .

Aspergillus niger showed a greater impact on the infected woods , when the losses ratio was ( 0.141 ) .