Effects of<i>Bacillus thuringiensis</i>isolates and single nuclear polyhedrosis virus in combination and alone on<i>Helicoverpa armigera</i>

Kalantari, Maryam; Marzban, Rasoul; Imani, Sohrab; Askari, Hassan

doi:10.1080/03235408.2013.802460

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…In present study, Bt and NPV were found integrating in additive and synergistic way making these combinations as more virulent than individual action. These finding stand parallel with the findings of Reddy and Manjunatha, (2000); and Kalantari et al, (2014) who observed additive interaction from most of combinations. Liu et al (2006) observed additive and antagonistic effect by combining NPV with Cry1Ac toxin against H. armigera.…”

Section: Discussionsupporting

confidence: 90%

“…Liu et al (2006) observed additive and antagonistic effect by combining NPV with Cry1Ac toxin against H. armigera. Kalantari et al (2014) reported synergistic action by combining Bt at lower concentration and HaSNPV at higher concentration. Combination of Cry1Ac and CPV has yielded additive and synergistic interaction by Marzban et al (2009) andMarzban (2012).…”

Section: Discussionmentioning

confidence: 99%

“…Two or more entomopathogens can work in collaboration, thus broaden the spectrum of action, range of targeted hosts (Kalantari et al, 2014), and lower the time to kill. It may be hypothesized that joint action of microbials may magnify the virulence expected in alone.…”

Section: Discussionmentioning

confidence: 99%

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Bacillus thuringiensis and Nuclear Polyhedrosis Virus for the Enhanced Bio-control of Helicoverpa armigera

Qayyum¹,

Wakil²,

Arif³

et al. 2015

IJAB

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A number of entomopathogenic microbial agents infect a wide array of insects and cause epizootics from time to time. Bacillus thuringiensis (Bt) and Nuclearpolyhedrosis virus (NPV) are two important potential pathogens of Helicoverpa armigera. Investigations were carried out on integration of B. thuringiensis and Nuclearpolyhedrosis virus to determine its impact on survival of second and fourth instar larvae under laboratory conditions. Both Bt and NPV were applied using diet incorporation method. Larvae continued to feed for 48 h when a batch of fifteen insects was exposed to diet mixed with any of the treatment. Mortality was recorded every 48 h until larvae died or pupated. The susceptibility of H. armigera larvae decreased with older stage as greater mortality was recorded in second instar larvae (95.45%) in comparison to fourth instar larvae (82.48%) in combined application of Bt and NPV. Application rate of Bt was the key for type of interaction as only one synergistic interaction (CTF≥20) was recorded when lower dose of Bt was combined with NPV, rest of the combinations were additive and independent (CTF≤20). Reduction in the pupation, adult emergence and egg eclosion was found directly related to pathogenicity of the applied agents. This study would be helpful to extend the integrated use of pathogens under field condition to many important insect pests.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Bacillus thuringiensis and Nuclear Polyhedrosis Virus for the Enhanced Bio-control of Helicoverpa armigera

Qayyum¹,

Wakil²,

Arif³

et al. 2015

IJAB

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“…These findings are comparable to the findings of Naqqash et al [ 49 ] who have reported quicker development of susceptible insects as compared to the insects under constant pressure. When two or more bio-active agents are employed together, they synergize each other’s effectiveness and host spectrum while decreasing mortality time [ 50 ]. This could be due to the fact that the polyhedral bodies of NPV bind to the epithelium of the host and multiply, killing the gut cells.…”

Section: Discussionmentioning

confidence: 99%

Sub-lethal doses of Nucleopolyhedrosis Virus and synthetic ınsecticides alter the biological parameters of Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)

et al. 2021

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Resistance management is very important for devising control strategies of polyphagous insect-pests like Helicoverpa armigera Hübner (Lepidoptera: Noctuidae). Considering the importance of resistance management, demographic features of selected and unselected populations of H. armigera were studied in 6 different treatments viz. emamectin benzoate, Helicoverpa armigera Nucleopolyhedrosis Virus (HaNPV), emamectin benzoate+HaNPV, spinetoram, spinetoram+HaNPV and control. Higher values for fecundity, intrinsic rate, the finite rate of increase (λ) were recorded in the control of selected as compared to the rest of treatment. Similarly, higher values for these population parameters viz. oviposition days, fecundity, intrinsic rate, the finite rate of increase were calculated in the unselected control. Similarly, net reproductive rate (R0) for selected and unselected control was higher as compared to the rest of the treatments. It may happen because these kinds of selection pressures can result in decreased fitness of the test insect thus decreased fitness of H. armigera in different treatments was observed as compared to the control. Additionally, quicker development of susceptible insects was observed because susceptible insects were growing without any stressor (xenobiotics) as compared to the rest which contributed to their faster development.

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“…This enhancement may be due to the synergistic action of mixing both Btk at high concentrations and SpliNPV at low concentrations. There have been reports of the synergistic effects of various biocontrol agents, such as Bt and NPV on H. armigera, SINPV-Btk on Culex pipiens (L.) (Mahmoud et al, 2012), Btk+SpliNPV against S. littoralis (Abd El-Kareem, 2016; Magholifard et al, 2020), and Bt-HaNPV against P. xylostella (Magholli et al, 2013;Kalantari et al, 2014;Shazdehahmadi et al, 2019). On the other hand, the lowest concentration of Bt could cause a delay in the development of the larvae and injure the cells of the targeted insect's intestine, resulting in an increase in the efficacy of SpliNPV (Salama et al, 1993) and a general decline in fitness (Nouri-Ganbalani et al, 2016).…”

Section: Pathogenicity Of Tested Entomopathogensmentioning

confidence: 99%

Latent and Histopathological Impacts of Three Bioinsecticides on The Female Reproductive System of Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae)

El-Sabagh

El-Kareem

2023

Egyptian Academic Journal of Biological Sciences. A, Entomology

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Recently, scientists searched for safe alternatives to synthetic insecticides to manage the cotton leafworm Spodoptera littoralis. Of these alternatives are microbial-based insecticides. These compounds are known for their unique larvicidal activity, especially against Lepidopterous insects. In this regard, the present investigation was carried out to evaluate the latent and histopathological influence of Bacillus thuringiensis var. kurstaki (Btk) and Spodoptera littoralis nuclear polyhedrosis virus (SpliNPV) either individually or in a mixture against the adult female of S. littoralis. The LC50 values of the tested entomopathogens were determined. The impact of median lethal concentrations of tested entomopathogens on adult longevity, fecundity, and fertility was assayed after treating 2 nd instar larvae. In addition, the histological changes in female ovaries due to treatment were investigated. Results showed that the low LC50 value showed that Btk+SpliNPV was the most hazardous against the 2 nd instar larvae, followed by SpliNPV and Btk. All tested entomopathogens did not cause high immediate larval mortality; however, larval mortality increased throughout the larval stage until pupation. There was also a significant reduction in fecundity and fertility of emerged females resulting from 2 nd instar larvae treatment. In addition, the treatment caused severe alterations in the histological structure of ovarioles. These findings support entomopathogens as a non-toxic alternative to conventional pesticides for controlling the cotton leafworm. Because of this, the population density of succeeding generations may decline since these organisms kill the treated larvae and have delayed effects that appear to reduce the eggs deposited and hatching. The results explain the reduced reproductive potential since these entomopathogens influence the female reproductive system when applied alone or as a mixture.

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Effects ofBacillus thuringiensisisolates and single nuclear polyhedrosis virus in combination and alone onHelicoverpa armigera

Cited by 12 publications

References 20 publications

Bacillus thuringiensis and Nuclear Polyhedrosis Virus for the Enhanced Bio-control of Helicoverpa armigera

Bacillus thuringiensis and Nuclear Polyhedrosis Virus for the Enhanced Bio-control of Helicoverpa armigera

Sub-lethal doses of Nucleopolyhedrosis Virus and synthetic ınsecticides alter the biological parameters of Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)

Latent and Histopathological Impacts of Three Bioinsecticides on The Female Reproductive System of Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae)

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