Toxicological and Biological Studies on Using Lufenuron, Chlorpyrifos, Spinosad and Emamectin Benzoate Insecticides for Controlling Cotton Leafworm, Spodoptera littoralis (Boisd.)

Abdel-Hamid,, M.; Aziz, Mohamed Abdel; El-Gabaly, A. R.

doi:10.21608/eajbsf.2021.223216

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…The main categories of IGRs are Juvenile hormone (JH) mimics and chitin synthesis inhibitors (CSIs) (Tunaz and Uygun, 2004). Several studies have investigated the efficacy of IGRs against S. littoralis (El-Sheikh & Aamir, 2011;Elsayed et al, 2017 andAbdel Aziz &El-Gabaly, 2021) evaluated the efficacy of lufenuron against S. littoralis. Similarly, Mageed et al (2018) investigated the effectiveness of chlorfluazuron against S. littoralis and reported that the mortality and sublethal effects of chlorfluazuron in insects, can provide a truly selective insecticide.…”

Section: Introductionmentioning

confidence: 99%

Toxicity Evaluation and Field Performance of Certain Insect Growth Regulators for Spodoptera littoralis Management in Cotton

Hasaneen¹,

Attia

2023

Alexandria Science Exchange Journal

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Spodoptera littoralis (Boisd) (Lepidoptera: Noctuidae), management requires the implementation of effective and sustainable control strategies. In this study, we aimed to compare the insecticidal activity and field performance of four commonly used insect growth regulators (IGRs) against S. littoralis larvae for helping in decision making to get the most effective and sustainable pest management for S. littoralis under local condition. The tested IGRs included Benzoylphenyl ureas BPUs (Lufenuron, Chlorfluazuron, Diflubenzuron), and an ecdysone receptor agonist (Methoxyfenozide). Laboratory bioassays were conducted to determine the toxicity of these IGRs against 2 nd and 4 th instar of S. littoralis larvae. Lufenuron exhibited the highest toxicity, with the lowest LC50 values (0106 & 0.069 and 0.889 &0.453 mg\l) at 72 and 96h of exposure, respectively. Chlorfluazuron, Diflubenzuron, and Methoxyfenozide displayed relatively lower toxicity compared to lufenuron, as their toxicity indexes were (2.59, 1.99 and 4.50) refereeing to the lowest LC50 value of Lufenuron against the 2 nd instar after 72h of exposure. Moreover, positive significant correlations were observed between the log LC50 values of each IGR and other tested ones (pairwise comparison) which alert the possibility of cross resistance between these IGRs. Field experiments were performed over two cotton seasons to assess the efficacy of the IGRs in reducing S. littoralis larval populations. All treatments resulted in a significant reduction in larvae compared to the control group. Lufenuron consistently demonstrated the highest initial efficacy (73.5 and 75.2%) and mean reduction (83.9 and 81.5%) after 15 days of treatment in both 2020 and 2021 seasons, respectively. In contrary, the lowest efficacy was recorded for Diflubenzuton with mean reduction (68.2 and 71.2) after 15 days of treatment in 2020 and 2021 cotton seasons, respectively. This finding highlights the importance of selecting IGRs with higher toxicity to achieve effective larval control. The work underscores the potential of lufenuron as a highly effective IGR for managing S. littoralis. Furthermore, our research emphasis the crucial of the continuous evaluation of IGRs efficacy and persistence as well as resistance and cross resistance to IGRs under local field conditions.

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Section: Introductionmentioning

confidence: 99%

Toxicity Evaluation and Field Performance of Certain Insect Growth Regulators for Spodoptera littoralis Management in Cotton

Hasaneen¹,

Attia

2023

Alexandria Science Exchange Journal

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Hematological and histopathological impacts of nano-emamectin benzoate against the larvae of the cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) under laboratory conditions

Amin

Ali

El-Sheikh

et al. 2022

Beni-Suef Univ J Basic Appl Sci

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Background Insects withstand foreign substances and infection by expressing robust defense responses, which are mediated by hemocytes, fat body, midgut, and many other tissues. The Egyptian cotton leafworm, Spodoptera littoralis (Boisduval), is a polyphagous pest with considerable economic importance in Egypt and globally. Many control strategies were employed to control this pest. Nowadays, there is a trend to use nanotechnology tools in agricultural practices as they balance minimal concentration and maximum pest control, safe concentration, and reduce the cost of pest control. The present study aimed to evaluate the hematological and histopathological response of S. littoralis larvae post-treatment with sublethal concentrations of emamectin benzoate and its nanoform, besides the silver nanoparticles. Results The results revealed the high toxicity of emamectin benzoate and its nanoform (LC50 values were 0.0524 and 0.023 ppm, respectively). The results also showed that all tested compounds significantly influenced the mean number of laid eggs/female. The emamectin benzoate nanoform (837.3 ± 52.09) was the most efficient compound compared to the control (1999.3 ± 46.5). The hematological responses against the EMB + AgNP were lowered total hemocyte counting (22.41 ± 1.3) compared to the untreated larvae (38.08 ± 0.83). In addition, there were some histopathological changes in the midgut tissues. They were represented as destroying the integrity of the epithelial cells and the ciliated border. The columnar cells began to disintegrate, and the peritrophic membrane became vacuolized. In contrast, the cuticle layers were not affected by various treatments. Conclusion We can conclude that the employment of emamectin benzoate, either in its original form or as its nanoform, is considered a promising substitute for conventional insecticides. The nanoform of emamectin benzoate proved its high efficiency against the larvae of the cotton leafworm, which may allow the application of this formulation at low concentrations.

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Toxicological and Biological Studies on Using Lufenuron, Chlorpyrifos, Spinosad and Emamectin Benzoate Insecticides for Controlling Cotton Leafworm, Spodoptera littoralis (Boisd.)

Abstract: http://eajbsf.journals.ekb.eg/ Toxicological and Biological Studies on Using Lufenuron, Chlorpyrifos, Spinosad and Emamectin Benzoate Insecticides for Controlling Cotton Leafworm, Spodoptera littoralis (Boisd.

Cited by 2 publications

References 8 publications

Toxicity Evaluation and Field Performance of Certain Insect Growth Regulators for Spodoptera littoralis Management in Cotton

Toxicity Evaluation and Field Performance of Certain Insect Growth Regulators for Spodoptera littoralis Management in Cotton

Hematological and histopathological impacts of nano-emamectin benzoate against the larvae of the cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) under laboratory conditions

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