Toxicological Studies on the Egyptian Cotton Leaf worm, Prodenia litura. VI. Potentiation and Antagonism of Organophosphorus and Carbamate Insecticides

Mansour, Nabil; Eldefrawi, Mohyee E.; Toppozada, A.; Zeid, M.

doi:10.1093/jee/59.2.307

Cited by 139 publications

(102 citation statements)

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“…Type of interaction was determined by equation CTF = (O c -O e )/O e ×100, where CTF is the cotoxicity factor, O c is the observed percentage mortality resulted from the combined application, and O e the expected percentage mortality, that is, the total percentage produced by each of the treatments used in the combination. The interactions were categorized into three groups: a positive factor of 20 or more meaning synergism, a negative factor of 20 or more meaning antagonism, and any intermediate value (i.e., between −20 and +20) was considered additive (Mansour et al, 1966;Wakil et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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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“…The means of corrected percent mortality and pupation rate was separated and compared using Tukey-Kramer (HSD) (Sokal and Rohlf, 1995) test at 5% significance level. The type of interaction between different concentrations for the H. armigera mortality was worked out by using the equation CTF = (oc-oe)/oe × 100, where CTF is cotoxicity factor, oc is observed percentage mortality resulted from the combined application and oe, the expected percentage mortality, is the sum of percentage produced by each of the treatment used in the combination (Mansour et al, 1966). On the basis of this factor, any intermediate value (i.e.…”

Section: Discussionmentioning

confidence: 99%

Insecticidal Efficacy of Azadirachta indica, Nucleopolyhedrovirus and Chlorantraniliprole Singly or Combined against Field Populations fo Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)

Wakil

Ghazanfar

Nasir

et al. 2012

Chilean J. Agric. Res.

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The development of resistance in cosmopolitan insect Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) forced the researchers for alternative control measures. In the present study, insecticidal efficacy of formulations of Azadirachta indica, a Nucleopolyhedrovirus (NPV), and new anthranilic diamide insecticide (chlorantraniliprole) formulations was determined against 2 nd , through 5 th larval instars of H. armigera collected from diverse geographical locations in the Punjab province, Pakistan. Azadirachta indica was applied at 5 µL L -1 ; NPV at 2.1 × 10 5 polyhedral occlusion bodies (POB) mL -1 and chlorantraniliprole at 0.01 µL L -1 , either alone or in combinations with each other. The bioassays were conducted at 27 ± 1 °C and 65 ± 5% relative humidity. The mortality varied greatly among treatments, larval instars, and locations. The combinations of NPV with A. indica and chlorantraniliprole caused higher mortality, pupation and produced an additive effect compared to their application singly in all the tested populations. The population from Rawalpindi was always susceptible while the Gujranwala was the resistant. The results herein suggest that the effectiveness of NPV and A. indica can be improved by the presence of chlorantraniliprole against the larvae of H. armigera.

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“…The equation CTF = (o c À o e )/o e Â 100 was used to determine the type of interaction between different concentrations, where CTF is the cotoxicity factor, o c is the observed percentage mortality produced by the combination and o e , the expected percentage mortality, is the sum of percentage produced by each of the pathogen used in the combination (Mansour et al, 1966). This factor was used to differentiate the results into three categories; a positive factor of 20 or more meaning synergism, while a negative factor of 20 or more meaning antagonism, and any intermediate value (i.e.…”

Section: Discussionmentioning

confidence: 99%

Effects of Bacillus thuringiensis toxin Cry1Ac and cytoplasmic polyhedrosis virus of Helicoverpa armigera (Hübner) (HaCPV) on cotton bollworm (Lepidoptera: Noctuidae)

Marzban

Liu

et al. 2009

Journal of Invertebrate Pathology

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Toxicological Studies on the Egyptian Cotton Leaf worm, Prodenia litura. VI. Potentiation and Antagonism of Organophosphorus and Carbamate Insecticides

Cited by 139 publications

References 0 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

Insecticidal Efficacy of Azadirachta indica, Nucleopolyhedrovirus and Chlorantraniliprole Singly or Combined against Field Populations fo Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)

Effects of Bacillus thuringiensis toxin Cry1Ac and cytoplasmic polyhedrosis virus of Helicoverpa armigera (Hübner) (HaCPV) on cotton bollworm (Lepidoptera: Noctuidae)

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