Insecticide resistance and efficacy evolved in field populations of Spodoptera littoralis in Egypt cotton season

Mona, Elhadek; Hafez, S. Sh.; Reham, Ali

doi:10.21608/eajbsf.2020.75972

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…In contrast, Elhadek (2021) evaluated the resistance status for IGRs in Menofia and Gharbia governorate in Egypt and found no resistance developed in S. littoralis field strains comes from both sides. Also, Elhadek et al (2020) reordered very low resistance ratios values to Lufenuron, Chlorflauzuron, and Diflubenzuron in Menofia and Gharbia field strains. Therefore, continuous evaluation of ICRs efficacy and susceptibility are in demand to avoid resistance and cross resistance development.…”

Section: Discussionmentioning

confidence: 91%

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: Discussionmentioning

confidence: 91%

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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“…Abdel-Mageed et al (2006) reported that spinosad gave moderately initial and residual effects when tested alone. (Elhadek, Hafez, and Ali 2020) indicates the high efficacy of some IGRs and Bioinsecticides to be used as an effective alternative method of S. littoralis control while insecticide resistance has developed for other traditional insecticides.…”

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confidence: 99%

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

Abdel-Hamid,

Aziz

El-Gabaly

2021

Egyptian Academic Journal of Biological Sciences, F. Toxicology

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Monitoring of Pesticides Resistance in Spodoptera littoralis from Some Governorates of Egypt: A Pilot Study Dependent on Biochemical Responses

Mona¹

2021

Egyptian Academic Journal of Biological Sciences, F. Toxicology

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The cotton leafworm Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) is a polyphagous insect pest. It is considered to be a major pest of great economic importance in many countries since it attacks several host plants (~ 40 families). The damage mainly plants injuries are mainly due to feeding on the foliar pants by young larvae (Brown and Dewhurst, 1975). Due to the repeated application of conventional pesticides over seasons, a resistance phenomenon was developed against their actions. In Egypt, synthetic pesticides are still used to control such insects as a principle method (Hafez et.al.,2018). In a study by Mondall and Parween (2001), a resistance monitoring program of cotton leafworm against certain bioinsecicides during ton seasons at 8 governorates was done. This action provided the ideal to use alternative control measures. It was documented that, bio-insecticides and insect growth regulators (IGR's) have potential effects against Lepidopterous pests (Farag, 2001;Abdel-Aal, 2003;Seth et al., 2004).Coupling use of biochemical quantifications and bioassay methods provides a reliable tool to detect pest's resistance against pesticides action in field populations,

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Insecticide resistance and efficacy evolved in field populations of Spodoptera littoralis in Egypt cotton season

Cited by 3 publications

References 2 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

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

Monitoring of Pesticides Resistance in Spodoptera littoralis from Some Governorates of Egypt: A Pilot Study Dependent on Biochemical Responses

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