Volume 2(2021) Number 1
  • EISSN: 2708-0463


تم استخلاص الزيوت الطيارة من قشور البرتقال الحلو () والبرتقال المر () لتقييم سميتهما بالرش تحت ظروف المختبر على الأفراد البالغة لحلم العنكبوت ذي البقعتين ( Koch) (Acari: Tetraychnidae)، وعلى الحلم المفترس ( Athias-Henroit) (Acari: Phytoseiidae) الذي يعد أهم الأعداء الطبيعيين لهذه الآفة. كما تم اختبار النشاط المتبقي لهذه الزيوت الطيارة. تم تحضير الزيوت بتراكيز مضاعفة وفقًا لأهداف الدراسة: 0.5، و1، و2، و4، و8% من كل زيت أساسي. أظهرت اختبارات السمية فعالية جيدة للزيوت الطيارة المختبرة، حيث قُدّر معدل قتلى () بـ 63.33% و68.74% لكل من البرتقال الحلو والبرتقال المر على التوالي، عند تركيز 8%. وفي المقابل، تعتبر هذه الزيوت عند التركيز نفسه أقل سمية على الأفراد البالغة للحلم المفترس () بنسب قتلى بلغت 25% و13.88% لكلا الزيتين على التوالي. كما أن النشاط المتبقي لهذه الزيوت يضمحل بمرور الزمن. نستخلص من هذه الدراسة أن الزيوت الطيارة المختبرة قد تمثل بديلًا واعدًا للمبيدات المصنعة ضمن برامج المكافحة الحيوية الصديقة للبيئة.

Two essential oils were extracted from the peel of sweet orange and bitter orange . The objective of this study is to assess their toxicity by direct contact under laboratory conditions, on adult individuals of the two-spot spider mite Koch (Acari: Tetraychnidae) and the predatory spider Phytoseiulus persimilis Athias-Henroit (Acari: Phytoseiidae) which is one of the most important natural enemies of this pest. The residual activity of these essential oils has also been tested at five increasing concentrations: 0.5%, 1%, 2%, 4% and 8%. The concentration of 8%, toxicity tests showed good efficacy of the tested essential oils, as the mortality rate for was estimated at 63.33% and 68.74% for sweet orange and bitter orange respectively. In contrast, these oils at the same concentration were found less toxic on adults of , with mortality rates of 25% and 13.88% for these oils, respectively. The residual activity of these oils also decays over time. We conclude from this study that the tested essential oils may represent a promising alternative to pesticides manufactured within environmentally friendly biological control programs.


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