Antifeedant and growth-inhibitory properties of neem limonoids against the cotton bollworm, Helicoverpa armigera (Hübner)

Murugan, Kadarkarai; Jeyabalan, D.; Kumar, Nikhil; Babu, R.; Sivaramakrishnan, S.; Senthil-Nathan, Sengottayan

doi:10.1017/s1742758400007803

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…24 Various intersections have been highlighted between biotechnology and nanotechnology via the development of environmental benign technologies in the eld of material sciences, whereby such materials can serve as defence chemicals, like insecticides, anti-feedants, repellents, oviposition deterrents, growth inhibitors, and moulting hormones as well as attractants due to the occurrence of secondary metabolites. 25 Despite the spectacular activities of silver nanoparticles, their large-scale utility is not yet considered due to the requirement of high dose concentrations, which can further induce toxicological effects on non-targeted organisms present in the environment. 26 Therefore, the utilization of highly biocompatible and biodegradable polymeric materials to synthesize the nanoparticles may be a far-reaching goal to overcome such environmental risk factors.…”

Section: Introductionmentioning

confidence: 99%

Bio-nanoparticle assembly: a potent on-site biolarvicidal agent against mosquito vectors

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Bio-nanoparticle assembly: a potent on-site biolarvicidal agent against mosquito vectors

et al. 2020

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“…Juss., has antifeedant, insect growth regulatory (IGR) and insecticidal effect on insects (Mordue et al 1998). Although, there are several potential insecticidal compounds in neem extracts, the principle active ingredient is the tetranortriterpenoid, Azadirachtin (AZA), which has a profound effect on the feeding, growth, moulting and reproduction of insects (Lee et al 1991;Murugan et al 1998b). Neem products can be mixed with other biopesticides, microbials or with synergists (Shapiro et al 1994;Murugan et al 1998aMurugan et al , 1999Koppenhofer and Kaya 2000).…”

Section: Introductionmentioning

confidence: 99%

Additive interaction of Helicoverpa armigera Nucleopolyhedrovirus and Azadirachtin

2007

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Mortality of Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) was higher in the combined treatment of Nucleopolyhedrovirus (NPV) and Azadirachtin (AZA) and mortality was increased when AZA concentration was doubled. Larval mortality decreased as the age of the larvae increased in all the treatments. The time for 100% kill of third instar larvae was significantly reduced to 72 h when AZA (0.1 ppm) was combined with NPV (10 3 PIB/ml) when compared to 168 and 120 h for the same dose NPV and AZA individual treatments, respectively. The average leaf disc consumption, consumption index (CI), relative growth rate (RGR), the efficiency of conversion of ingested (ECI) and digested (ECD) food values were drastically reduced in the combined treatment of NPV and AZA than in the individual treatments. Larval as well as pupal durations were significantly extended and the adult longevity and fecundity were significantly reduced in the combined treatment of NPV and AZA. Weight of 14 day old control larvae was 420 mg and it was reduced to 299 and 248 mg after NPV (5 · 10 2 PIB/ml) and AZA (0.025 ppm) treatments, respectively. The larval weight was drastically decreased to 99 mg after the combined treatment at the same dose. The additive interaction between both the treatments, AZA and NPV, was found to be in a dose dependent manner and were highly compatible in disrupting the survival, feeding and biology of H. armigera.

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“…In other experiments [37,38] using three commercial neem products, diamondback moth larvae died by the 7th day and also the products exhibited antifeedant and growth reduction attributes. The low mortality reported here for the Agroneem treatments is more of an indirect effect from a lower leaf intake due to antifeedant properties in the neem treatment [34,35].…”

Section: Discussionmentioning

confidence: 88%

Laboratory Evaluation of Biorational and Low Risk Insecticides and Their Mixtures for Management of Diamondback Moth Larvae

Flanery¹,

Sintim²,

Dingha³

et al. 2016

JAST-A

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Abstract:The diamondback moth, Plutella xylostella L., has developed resistance to most insecticides used for its management. Suggested alternatives to forestall this process include biorational insecticides in mixtures with low-risk insecticides. The aim of this study was to select an insecticide or insecticide mixture that could be adopted by small-scale growers for diamondback moth management. The effectiveness of four insecticide mixtures, i.e., Agroneem ® Plus (neem-derived), Spinosad (microbial origin), thiamethoxam (neonicotinoid) and a homemade methanol Jalapeño pepper extract, in laboratory bioassays was evaluated. Binary mixtures were tested against single products at manufacturer's label rates. These were applied to collard greens using the leaf dip method and fed to the newly molted 2nd or 3rd instar larvae. Mixtures were evaluated for efficacy based on larval mortality and consumption of leaf discs. The results showed interactions between Jalapeño pepper extract and Spinosad and between the neem-derived Agroneem ® Plus and thiamethoxam at some of the tested concentrations. Mixtures with at any amount of Spinosad killed all larvae. The neem-based product gave inconsistent results in some treatments; in some case, increased leaf damage did not result in commensurate larval mortalities. The reported resistance of diamondback moth larvae to Spinosad was not observed during this study, neither with Spinosad alone nor in mixtures.

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Antifeedant and growth-inhibitory properties of neem limonoids against the cotton bollworm, Helicoverpa armigera (Hübner)

Cited by 9 publications

References 11 publications

Bio-nanoparticle assembly: a potent on-site biolarvicidal agent against mosquito vectors

Bio-nanoparticle assembly: a potent on-site biolarvicidal agent against mosquito vectors

Additive interaction of Helicoverpa armigera Nucleopolyhedrovirus and Azadirachtin

Laboratory Evaluation of Biorational and Low Risk Insecticides and Their Mixtures for Management of Diamondback Moth Larvae

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