Nutritional Indices and Efficacy of Acokanthera spectabilis (Hochst.) Extract and Chlorfluazuron against Spodoptera littoralis (Boisd.) Escorted by Mitigating Amendment to the Light Impact | ||
| Journal of Plant Protection and Pathology | ||
| Article 4, Volume 14, Issue 11, November 2023, Pages 367-378 PDF (675.94 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2023.241066.1185 | ||
| Authors | ||
| Wael Khamis* 1; Ehsan Abdel-Moety2; S. I. Behiry3 | ||
| 1Plant Protection Research Intitute, Agricultural Research Center, Al-Sabhia, Alexandria, Egypt | ||
| 2Plant Protection Research Institute, Agricultural Research Center, Al-Sabhia, Alexandria, Egypt | ||
| 3Agricultural Botany Department, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria 21531, Egypt | ||
| Abstract | ||
| Counteractions of beta cyclodextrin (βCD) to the light intensity’s impact were investigated on the nutritional indices of Acokanthera spectabilis (Hochst.) extract and chlorfluazuron 5% EC againstthe 4th instar larvae of Spodoptera littoralis (Boisd.). The LC10 value of chlorfluazuron 5% EC (0.92 mg L-1) transcended A. spectabilis extract (0.56 mg L-1) and vice versa for the LC90 values. The most abundant HPLC-compounds of the extract were ferulic acid (2082.49 µg g-1), and ellagic acid (804.74 µg g-1) as well aspalmitic acid (39.89%), and cis-vaccenic acid (14.05%) in GC-MS analysis. There was relative advantage for βCD addition at0.40 gm L-1 to the sub-lethal concentrationsof the tested compounds, observed by their lowest relative potency and highest toxicity index. In darkness, 5000, and 10000 LUX, βCD-mixed extract affected all the larvae’s nutritional indices, likewise βCD-mixed chlorfluazuron 5% EC at 10000 and 20000 LUX excluding dry gained weights, and relative growth rate. Equally highest alkaline phosphatase levels at 48 hrs of exposure to βCD-mixed extract and chlorfluazuron 5% EC were 125.73 and 131.00 U L-1, respectively. Semi-field trials along two seasons showed equally high residual toxicities in net and βCD-mixed extract, as well as highest residual toxicity, and persistency in βCD-mixed chlorfluazuron 5% EC. Spray application of these compounds was safe for the chlorophyll-leaf content, with observed augmentation in all extract treatments. Ultimately, βCD-mixed chlorfluazuron 5% EC could enhance the controlling S. littoralis, while the A. spectabilis extract could be applied alone under light intensity. | ||
| Keywords | ||
| cotton leafworm; benzoylphenylurea; african wintersweet; alkaline phosphatase; residual toxicity; persistency | ||
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