Insecticidal and repellant activities of selected botanical extracts against rice weevil (Sitophilus oryzae L.)
Stored rice is infected primarily by adult rice weevil (Sitophilus oryzae L.). Botanical pesticides could be alternatives to synthetic insecticides due to their effectiveness and lower toxicity. This study investigated repellence activity, insecticidal activity and phytochemical composition of...
محفوظ في:
| المؤلف الرئيسي: | |
|---|---|
| التنسيق: | أطروحة |
| اللغة: | English English English |
| منشور في: |
2020
|
| الموضوعات: | |
| الوصول للمادة أونلاين: | http://eprints.uthm.edu.my/1044/1/24p%20NAJM%20HUSSEIN%20ALI%20ALBARIMAN.pdf http://eprints.uthm.edu.my/1044/3/NAJM%20HUSSEIN%20ALI%20ALBARIMAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1044/2/NAJM%20HUSSEIN%20ALI%20ALBARIMAN%20WATERMARK.pdf |
| الوسوم: |
إضافة وسم
لا توجد وسوم, كن أول من يضع وسما على هذه التسجيلة!
|
| الملخص: | Stored rice is infected primarily by adult rice weevil (Sitophilus oryzae L.). Botanical
pesticides could be alternatives to synthetic insecticides due to their effectiveness and
lower toxicity. This study investigated repellence activity, insecticidal activity and
phytochemical composition of acetone and ethanol extracts of basil leaves (Ocimum
basilicum), turmeric leaves (Curcuma longa) and akar mempelas stem (Tetracera
macrophylla) against adult rice weevil (Sitophilus oryzae L.) on stored rice.
Methodology involved preparing 0%, 10%, 20% and 30% concentrations of either
ethanol or acetone extract of each plant to be examined for their repellence activity,
contact toxicity and phytochemical composition using gas chromatography-mass
spectroscopy (GC-MS). Results showed that acetone and ethanol extracts of the three
plants exerted dose-dependent repellence and time-dependent contact toxicities.
Ethanol extracts of the three plants showed superior repellence activity and contact
toxicity were superior to those of their acetone extracts, while the repellence activity
and contact toxicities of the ethanol and acetone extracts of basil were superior to
those of turmeric and Akar mempelas. GC-MS indicated that basil acetone extract
contained anethole, while the ethanol extract contained bis (2-Ethylhexyl) phthalate.
Turmeric acetone extract contained Ar-turmerone, while the ethanol extract
contained bis(2-Ethylhexyl) phthalate. Akar mempelas stem acetone extract
contained 1-tetradecene, while the ethanol extract contained 1-octadecene and bis(2-
Ethylhexyl) phthalate. In conclusion, acetone and ethanol extracts of basil leaves,
turmeric leaves and akar mempelas stem exhibited effective dose-dependent
repellant activities and time-dependent insecticidal activities against the adult rice
weevil. However, the repellant and contact toxicity of ethanol extracts of the basil,
turmeric and akar mempelas were superior to those of their acetone extracts, while
the repellence and contact toxicities of the ethanol and acetone extracts of basil were
superior to those of turmeric and akar mempelas. |
|---|