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The Effectiveness of Some Plant Extracts Against Adults of The Rice Weevil, Sitophilus oryzae L. Under Laboratory Conditions
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Esber, R. 2024. The Effectiveness of Some Plant Extracts Against Adults of The Rice Weevil, Sitophilus oryzae L. Under Laboratory Conditions. Arab Journal of Plant Protection, 42(3): 368-376. https://doi.org/10.22268/AJPP-001248 In this study, the effectiveness of three plant extracts (Schinus molle, Melia azedarach and Thymus vulgaris) against adults of the rice weevil, Sitophilus oryzae L. (Coleoptera: Curculionidae), using concentrations of 25, 50 and 100%, were investigated. Insect mortality was evaluated 1, 2, 3, 4, 9, 15 and 20 days after treatment, and the corrected mortality rate in addition to the LC50 and LC90 and the LT50 and LT90 values were calculated. The results obtained showed an increase in the mean of corrected mortality rate with increasing concentration and time after treatment, where the values reached 70, 100 and 80% at the concentration of 100% one day after treatment with plant extracts of S. molle, M. azedarach and T. vulgaris, respectively. The extract M. azedarach was superior to the extracts of S. molle and T. vulgaris with a significant difference at P=0.01. The LC50 values 4 days after treatment were 54.42% for S. molle, 30.23% for M. azedarach, and 39.19% for T. vulgaris. Whereas the LC90 values were 64.68 and 78.89% for M. azedarach and T. vulgaris, respectively. The LT50 and LT90 values at the concentration of 50% were 5.51 and 39.81 days for the S. molle, 1.04; 11.94 days for the M. azedarach; 1.59 and 35.17 days for the T. vulgaris extracts. Whereas the LT50 values at a concentration of 100% were less than one day for the three studied extracts. The highest effectiveness of M. azedarach extract was achieved at concentrations of 25 and 50%, and the values were similar to T. vulgaris extract at a concentration of 100%, when the corrected mortality rate reached 100% three days after treatment, with both extracts being superior to the S. molle extract at the same concentration and time after treatment. Keywords: Extracts, Schinus molle, Melia azedarach, Thymus vulgaris, rice weevil, Sitophilus oryzae
Title: The Effectiveness of Some Plant Extracts Against Adults of The Rice Weevil, Sitophilus oryzae L. Under Laboratory Conditions
Description:
Esber, R.
2024.
The Effectiveness of Some Plant Extracts Against Adults of The Rice Weevil, Sitophilus oryzae L.
Under Laboratory Conditions.
Arab Journal of Plant Protection, 42(3): 368-376.
https://doi.
org/10.
22268/AJPP-001248 In this study, the effectiveness of three plant extracts (Schinus molle, Melia azedarach and Thymus vulgaris) against adults of the rice weevil, Sitophilus oryzae L.
(Coleoptera: Curculionidae), using concentrations of 25, 50 and 100%, were investigated.
Insect mortality was evaluated 1, 2, 3, 4, 9, 15 and 20 days after treatment, and the corrected mortality rate in addition to the LC50 and LC90 and the LT50 and LT90 values were calculated.
The results obtained showed an increase in the mean of corrected mortality rate with increasing concentration and time after treatment, where the values reached 70, 100 and 80% at the concentration of 100% one day after treatment with plant extracts of S.
molle, M.
azedarach and T.
vulgaris, respectively.
The extract M.
azedarach was superior to the extracts of S.
molle and T.
vulgaris with a significant difference at P=0.
01.
The LC50 values 4 days after treatment were 54.
42% for S.
molle, 30.
23% for M.
azedarach, and 39.
19% for T.
vulgaris.
Whereas the LC90 values were 64.
68 and 78.
89% for M.
azedarach and T.
vulgaris, respectively.
The LT50 and LT90 values at the concentration of 50% were 5.
51 and 39.
81 days for the S.
molle, 1.
04; 11.
94 days for the M.
azedarach; 1.
59 and 35.
17 days for the T.
vulgaris extracts.
Whereas the LT50 values at a concentration of 100% were less than one day for the three studied extracts.
The highest effectiveness of M.
azedarach extract was achieved at concentrations of 25 and 50%, and the values were similar to T.
vulgaris extract at a concentration of 100%, when the corrected mortality rate reached 100% three days after treatment, with both extracts being superior to the S.
molle extract at the same concentration and time after treatment.
Keywords: Extracts, Schinus molle, Melia azedarach, Thymus vulgaris, rice weevil, Sitophilus oryzae.
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