Abstract
The current work was done Artemisia herba-alba and Artemisia compestris essential oils harvested from the Eastern Algerian Sahara, their insecticidal characteristics against the eggs and adults of the date moth Ectomyelois ceratoniae. Indeed, two treatment modes were used; by contact application on eggs and by inhalation against adults. It appears from the results that the hatch rates were less than the hatching rate recorded in the control (96% ±00.00). The hatching rate reported on eggs treated by the highest dose (160 μl/ml) of Artemisia herba-alba and Artemisia compestris essential oils are 16.66 ± 08.81 and 37.77 ± 13.47 respectively. Statistical treatment results by the Chi-square test (χ2), attest that the treatment by A. herba-alba and Artemisia compestris essential oils at the same dose (160 μl/ml) affect significantly (χ2 = 35.62, p = 0.00 and χ2 = 21.17, p = 0.00 respectively) the hatching rate compared to the control. The sensitivity of adults to essential oils is expressed by 100% mortality rates obtained after 10 min of treatment by the highest doses (80 μl/ml and 160 μl/ml) of A. herba-alba essential oils, the same mortality rates (100%) were notified with the same doses (80 μl/ml and 160 μl/ml) after 20 min and 15 min of treatment by Artemisia compestris essential oils respectively. The dose-dependent mortality data revealed that there was a significant difference between the five doses of A. herba-alba essential oil tested except at the last treatment time (20 min) for which it was appeared p = 0.571, while for A. compestris essential oil, a significant difference was recorded with p varying between 0.00 and 0.003. The lowest LD50 value (0.09 μl/ml and 16.71 μl/ml) were noted during the longest treatment time (20 min), while the highest LD50 value (75.85 μl/ml and 263.7 μl/ml) were found during the shortest time (5 min) of A. herba-alba and A. compestris respectively. J. Bio-Sci. 29(2): 09-17, 2021 (December)
Highlights
Among the various parasitic attacks and diseases that affect the date, the major problem for importers is the fruit infestation by the date moth
The objective of this study mainly focused on Artemisia herba-alba Asso. and Artemisia compestris L. (Asteraceaes) essential oils harvested from the eastern Algerian Sahara, their insecticidal characteristics against the eggs and adults of the date moth Ectomyelois ceratoniae
Hatching rates of 88.99±02.03%; 83.33±00.00%; 75.55 ± 8.39%; 49.99 ± 8.81% and 16.66 ± 8.81% have been reported on eggs treated with A. herba alba essential oils at concentrations 10, 20, 40, 80 and 160 μl/ml respectively, with the same concentrations for order of A. compestris essential oil, registered hatching rate were 85.55 ± 1.92%; 82.22 ± 3.84%; 73.33 ± 3.33; 65.56 ± 5.09% and 37.77 ± 13.47% respectively (Table 1)
Summary
Among the various parasitic attacks and diseases that affect the date, the major problem for importers is the fruit infestation by the date moth. Continuous attack of the pest, incapacity and defects of chemical control, obliges to orient towards other means less drastic and more environmentally compatible (Escoubet 2011). Biopesticides of plant origin are called the means for a better future, because demand for safe crop protection products of low persistence and qualified as "green products" are on the rise which ones based on essential oils can be the tools of choice in management programs of pest resistance to pesticides (Isman 2000). (Asteraceaes) essential oils harvested from the eastern Algerian Sahara, their insecticidal characteristics against the eggs and adults of the date moth Ectomyelois ceratoniae The objective of this study mainly focused on Artemisia herba-alba Asso. and Artemisia compestris L. (Asteraceaes) essential oils harvested from the eastern Algerian Sahara, their insecticidal characteristics against the eggs and adults of the date moth Ectomyelois ceratoniae
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