Effet insecticide du Melia azedarach sur Thaumetopoea bonjeani Powell du cèdre de l’Atlas cas d’Ouled Yaagoub
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Date
2018
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Université Abbes Laghrour -Khenchela-
Abstract
ABSTRACT
The evaluation of the insecticidal potentialities and the larvicidal activity of the
aqueous and ethanolic extracts of Melia azedarach regarding the processionary caterpillar
of cedar "Thaumetopoea Bonjeani" in stage L4, was carried out by testing 3 doses: 100,
500 and 1000 ppm of each extract under laboratory conditions. The results showed a lethal
larvicidal effect of both extracts compared to the results recorded in the controls. On the
other hand, the aqueous extract of the leaves seems harmless at low doses on the larvae on
L4 stage. Regarding the transformation of larvae into chrysalis, our results have shown that
fruit extracts strongly stimulate this transformation. Conversely, what has been observed
for the aqueous extract where the results are nil for almost all concentrations and regardless
of the treatment time. These results are similar to those of the anti-appetizing activity
where the effect is more pronounced for fruit extracts than leaves. The test on the black
Ant Formica glacialis showed that ants are sensitive to different extracts and doses of Melia
azedarach. The difference in yield of our extracts is probably due to the extraction
techniques used, which are totally different and to the chemical composition which differs
from one extract to another and also to the duration of the treatment which increases the
mortality in the larvae.