Effect of dietary stress of emamectin benzoate on the fitness cost of American bollworm, Helicoverpa armigera (Hübner, 1808)

Dagar, Vinay Singh; Mishra, Monika; Kumar, Sarita

doi:10.1007/s42690-020-00168-x

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…Supporting findings of the present study, the lethality of emamectin benzoate on some noctuid-lepidopteran pests, including Helicoverpa zea Boddie (Lepidoptera: Noctuidae) (López et al, 2010), T. absoluta (Gacemi & Guenaoui, 2012), Spodoptera littoralis Boisd (Lepidoptera: Noctuidae) (El-Sheikh, 2015) and H. armigera (Hübner) (Lepidoptera: Noctuidae) (Dagar et al, 2020), was reported in the previous studies. Similar to our results, Tomé et al (2012) and Berxolli & Shahini (2017) indicated that azadirachtin had significant toxicity against T. absoluta larvae.…”

Section: Discussionsupporting

confidence: 82%

Toxicity and biochemical effects of emamectin benzoate against Tuta absoluta (Meyrick) alone and in combination with some conventional insecticides

et al. 2021

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The tomato leaf miner, Tuta absoluta (Meyrick), is one of the serious insect pests in tomato and potato farms. Along with acute toxicity, effects of emamectin benzoate alone and mixed with some conventional insecticides on esterase enzymes and the protein content of T. absoluta second‐instar larvae were assessed in the current study. After 72 h exposure time, emamectin benzoate had the most toxicity (LC50 = 0.52 mg a.i. L−1), followed by azadirachtin (LC50 = 5.19 mg a.i. L−1), indoxacarb (LC50 = 7.13 mg a.i. L−1), imidocloprid (LC50 = 44.63 mg a.i. L−1), thiacloprid (LC50 = 293.92 mg a.i. L−1) and lambda‐cyhalothrin (LC50 = 610.08 mg a.i. L−1). Although emamectin benzoate mixed with either azadirachtin or indoxacarb at LC15: LC15 (Lethal Concentration to kill 15% tested insects) ratio had synergistic effects, its combination with imidacloprid or thiacloprid showed additive interactions. However, emamectin benzoate mixed with imidacloprid at both LC25: LC25 and LC50: LC50 ratios showed synergistic effects. Lambda‐cyhalothrin mixed with emamectin benzoate showed an antagonistic interaction in all tested ratios. α‐esterase activity of larvae increased when emamectin benzoate was mixed with thiacloprid in comparison with emamectin benzoate alone and the control. Combinations of emamectin benzoate with either azadirachtin or indoxacarb significantly reduced the total protein content of larvae. Generally, it can be concluded that the combination of emamectin benzoate with either azadirachtin, indoxacarb, or imidacloprid resulted in more negative impacts against T. absoluta larvae.

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Section: Discussionsupporting

confidence: 82%

Toxicity and biochemical effects of emamectin benzoate against Tuta absoluta (Meyrick) alone and in combination with some conventional insecticides

et al. 2021

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“…Emamectin benzoate has an ovicidal activity in some lepidopteran pests, including M. brassica and T. absoluta (Moustafa et al 2016;Kandil et al 2020a). This could be attributed to the lethality of emamectin benzoate against Noctuidae species, including H. zea (López et al 2010), T. absoluta (Gacemi & Guenaoui 2012) and H. armigera (Dagar et al 2020). Alternatively, it could be related to physiological effects (Yin et al 2008) caused by insecticides, including fecundity and fertility (Liu & Trumble 2005).…”

Section: Discussionmentioning

confidence: 99%

Biological impact, oxidative stress and adipokinetic hormone activities of Agrotis ipsilon in response to bioinsecticides

Moustafa¹,

Elmenofy²,

Osman³

et al. 2022

Plant Prot. Sci.

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The use of biological control products enhances the reduction of harmful pressures on the environment caused by the use of conventional pesticides. Therefore, this study aims to evaluate the toxicity of eight bioinsecticides on the black cutworm Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae) to understand the relationships between insecticide exposure and insect response at the individual and population levels. The bioassay results showed that emamectin benzoate had high toxicity against A. ipsilon second instar larvae with an LC<sub>50</sub> of 0.007 (mg/L). Sublethal concentration (LC<sub>30</sub>) of emamectin benzoate, spinosyn group and Bacillus thuringiensis formulation (Dipel 2X) had significantly prolonged pupal period. In addition, emamectin benzoate significantly decreased the number of eggs laid per female (135.3 ± 6.919) compared with the control treatment. Thus, the formulation of chlorfenapyr showed a 1.26-fold reduction in hatching rate. Meanwhile, the activities of oxidative stress enzymes (catalase, superoxide dismutase, lipid peroxidase, and glutathione reductase) were significantly affected due to exposure to sublethal concentration. Changes in adipokinetic hormone (AKH) transcriptional regulation were detected via SQ-PCR via using cDNA synthesized from mRNA isolated from treated A. ipsilon larvae. The results showed a higher transcription rate of AKH in spinotram-treated larvae with a 1.42-fold increase over untreated larvae. Our results provide useful information for integrated pest management programs for A. ipsilon by using bioinsecticides.

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Alterations in the gut enzymes of Helicoverpa armigera (Hübner) induced by dietary Artemisia annua L. essential oil

Dagar

Mishra

Sharma

et al. 2023

Int J Trop Insect Sci

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Effect of dietary stress of emamectin benzoate on the fitness cost of American bollworm, Helicoverpa armigera (Hübner, 1808)

Cited by 6 publications

References 27 publications

Toxicity and biochemical effects of emamectin benzoate against Tuta absoluta (Meyrick) alone and in combination with some conventional insecticides

Toxicity and biochemical effects of emamectin benzoate against Tuta absoluta (Meyrick) alone and in combination with some conventional insecticides

Biological impact, oxidative stress and adipokinetic hormone activities of Agrotis ipsilon in response to bioinsecticides

Alterations in the gut enzymes of Helicoverpa armigera (Hübner) induced by dietary Artemisia annua L. essential oil

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