Sublethal effects of different fungal isolates on Helicoverpa armigera (Lepidoptera: Noctuidae)

Souza, Tamires Doroteo de; Fernandes, Fabrício Oliveira; Sanches, Ariadne Costa; Polanczyk, Ricardo Antônio

doi:10.1186/s41938-020-00327-9

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…Overall results regarding sex ratio describe that high concentration applied produces relatively low percentage of females. Results of De Souza et al (2020) are also in line with our current findings predicting that sex ratio of Helicoverpa armigera (Lepidoptera: Noctuidae) is independent to concentration applied. The results of Batcho et al (2018) also support our obtained results.…”

Section: Discussionsupporting

confidence: 90%

On the virulence of the entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae (Ascomycota: Hypocreales), against the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae)

Shehzad

Tariq

Mukhtar

et al. 2021

Egypt J Biol Pest Control

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Background The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), is a noxious pest of cruciferous crops all over the world causing serious economic damage. Management of insect pest generally depends on chemical control; however, due to development of resistance against all types of insecticides, alternative approaches especially utilization of a microbial agent is inevitable. Results Potential of 2 entomopathogenic fungi (EPF), viz., Beauveria bassiana and Metarhizium anisopliae, was evaluated against 2nd and 3rd larval instars of P. xylostella by adopting leaf dip and direct spraying methods under laboratory conditions. Significant mortality rate was achieved by each fungus under adopted methodologies. However, B. bassiana was found to be more effective in both conditions than M. anisopliae. Highest mean corrected mortality (77.80%) was recorded, when spores of B. bassiana were sprayed on the 2nd instar larvae (LC50=1.78×104/ml) after the 6th day of treatment. Similarly, incase of M. anisopliae LC50 for the 2nd instar at the same methodology was 2.78×104/ml with a mortality percentage of 70.0%. Offspring sex ratio was non-significantly related to treatment concentration and methodology, except for the control. Conclusion Beauveria bassiana and M. anisopliae had potential to suppress P. xylostella infestations when applied appropriately. Present findings suggested that B. bassiana and M. anisopliae when sprayed on immatures of host insect had more effect as compared to leaf dip procedure. Furthermore, no significant effect of concentrations was observed on sex ratio.

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Section: Discussionsupporting

confidence: 90%

On the virulence of the entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae (Ascomycota: Hypocreales), against the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae)

Shehzad

Tariq

Mukhtar

et al. 2021

Egypt J Biol Pest Control

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“…The increase in mortality percentage may be due to the quantity of conidia received by the host insect. As to the above illustrated results from treated eggs, newly hatched larvae and pupa of P. gossypiella with three concentrations of B. bassiana and M. anisopliae proved that B. bassiana more effective mortality percentage on the eggs and pupal stages than all M. anisopliae isolates, whereas on larval stages the M. anisopliae isolate (M1) caused high mortality than the rest of the isolates, this results in agreement with (de Souza et al, 2020), when study the sub-lethal concentrations of different fungal isolates on Helicoverpa armigera they found that the mortality percentage of 2 nd caterpillars due to the fungi isolates of B. bassiana and M. anisopliae were various values. The isolates of M. anisopliae ( IBCB 425 and ESALQ 860) and B. bassiana ( IBCB 1363 and IBCB 36) with the highest means and the use of sub-lethal concentrations of the fungi isolates of B. bassiana and M. anisopliae was caused a negative effect on the biology of (H. armigera.…”

Section: Discussionsupporting

confidence: 85%

Pathogenicity Of Entomopathogenic Fungi Isolates on Immature Stages Of Pectinophora Gossypiella (Saunders), (Lepidoptera: Gelechiidae)

awad

Ali²,

El-Habal³

2022

Egyptian Journal of Agricultural Research

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The pink bollworm, Pectinophora gossypiella, (Saunders) (Lepidoptera: Gelechiidae) considers as one of the world's most invasive insects, is a voracious lepidopteran pest of cotton. To control this insect pest and increase crop yield, chemical pesticides was mainly used and that caused resistant population and side effects for human and environment. Therefore, there is a need to increase of alternative methods such as the biological control. During the current study, five fungi isolates, one of Beauveria bassiana (AUMC 9896) and four of Metarhizium anisopliae (M1, M2, M3 &M4) were evaluated against the eggs, new hatched larvae, and pupa of P. gossypiella under laboratory conditions. Bioassay was performed using spores suspension concentrations (1.0 × 10 6 , 1.0× 10 7 and 1.0×10 8 spores /ml). Results showed that B. bassiana (AUMC 9896) proved to be more toxicity than M. anisopliae isolates as depicted by the calculated LC50 values on all treated stages, egg, larva, and pupa. On the other hand, the highest egg and pupal mortality percentages were recorded to B. bassiana (76.7 and 80.0%), respectively, at the same concentration (1×10 8 spores /ml). Whereas the isolate M. anisopliae (M4) showed the least one (23.3 and 46.6 %). Also, M. anisopliae isolates (M1 & M4) had recorded the highest value of larval mortality (86.7%). Thus, it can be concluded that the isolates B. bassiana (AUMC 9896 and M1) were strong pathogenicity while the isolates (M3&M4) were moderate and (M2) was showed low pathogenicity.

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“…This note was in agreement with that obtained byShehzad et al (2021) when tested other isolate of the same fungi species against another lepidopterous insect (P. xylostella). Other study carried out byDe Souza et al (2020) recorded that the sex ratio of emerged adults from treated larvae of H. armigera (Family: Noctuidae) was also affected by B. bassiana treatment. The imbalance in the sex ratio of emerged adults from treated larvae with the isolated fungus as shown in our findings, and results of other researchers may be due to sensitivity variations between different species to the fungus spores and some other unknown factors.…”

mentioning

confidence: 98%

Identification and evaluation of isolated entomopathogenic fungus from Egyptian soil against the black cutworm larvae of Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)

Ahmed

Khalil

Sahab

2022

Egypt J Biol Pest Control

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Background The black cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae), is considered as one of the most destructive pests of many field crops in Egypt. Entomopathogenic fungi (EPF) have long been accepted as relatively safe alternatives to chemical insecticides. In the past decades, many researchers have compared the effective local isolates of EPF to the formulated product of the same fungus and reported that local isolates were more efficient than formulations when used against target insects. Results The present study discussed the pathogenic activity of local isolate after scientific characterization. Two insect species [Galleria mellonella L. and Agrotis ipsilon (Hufn.)] were used in this evaluation. The fungus was isolated from soil samples by trapping method, and fourth-instar larvae of Galleria were used to evaluate the pathogenicity of the isolate. The isolate was identified as Beauveria bassiana. Different levels of the fungus development depending on the test temperatures (20, 25, 30, 35 and 40 °C) were tested. Optimal growth of the isolate fungus was recorded at 25 °C. The corrected mortality rate for fourth-instar larvae of G. mellonella treated with the isolate spores at 6.4 × 105 spores/ml was (96%) after 10 days, while the mortality of last instar larvae of A. ipsilon was (48 and 100%) at the concentrations of 9.2 × 104 and 2.9 × 106 spores/ml, respectively, after 14 days compared to (24%) in the control. Both pupation and the sex ratio in adults were affected at different levels according to the concentration. The effect was also very clear in the increased rates of malformation in adults. Conclusion The EPF, B. bassiana, isolated from the soil, was highly effective against G. mellonella larvae in storage and A. ipsilon larvae in soil; therefore, it could be recommended as an alternative control agent for chemical pesticides.

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Sublethal effects of different fungal isolates on Helicoverpa armigera (Lepidoptera: Noctuidae)

Cited by 9 publications

References 25 publications

On the virulence of the entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae (Ascomycota: Hypocreales), against the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae)

On the virulence of the entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae (Ascomycota: Hypocreales), against the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae)

Pathogenicity Of Entomopathogenic Fungi Isolates on Immature Stages Of Pectinophora Gossypiella (Saunders), (Lepidoptera: Gelechiidae)

Identification and evaluation of isolated entomopathogenic fungus from Egyptian soil against the black cutworm larvae of Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)

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