Parasitoides associados com Helicoverpa armigera em áreas de refúgio de algodão, no Oeste da Bahia, Brasil

Luz, Priscila Maria Colombo da; Paula‐Moraes, Silvana V.; López, Juan Manuel Perilla; Pujol-Luz, José Roberto; Penteado-Dias, Angélica María; Specht, Alexandre; Diniz, Ivone Rezende

doi:10.1590/0103-8478cr20170250

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Considering that agrosystems should be managed according to IPM principles to maintain the natural balance, many aspects of basic and applied research on H. armigera and H. zea must be investigated, considering each moth species separately and their interaction in each crop or crop system. Research is needed on the action of natural enemies, including predators, parasitoids, and microorganisms, 75–78 and their potential to reduce populations of these lepidopteran pests. Studies should include augmented biological‐control strategies using inundative or inoculative release of control species of proven efficiency, 79,80 taking into consideration the economic viability of their use in a particular crop or cultivation system.…”

Section: Discussionmentioning

confidence: 99%

Helicoverpa armigera and Helicoverpa zea hybridization: constraints, heterosis, and implications for pest management

Rios

Specht

Roque–Specht

et al. 2021

Pest Management Science

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BACKGROUND: The invasion of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) into the New World has made it possible for this pest to hybridize with a native American species, H. zea (Boddie), under natural conditions. We investigated the viability and development of hybrids of these two Helicoverpa species. We reared the parental species and evaluated crosses between H. armigera males and H. zea females and vice versa, two intercrosses between hybrids, and eight backcrosses between hybrids and parental species. We estimated the length of immature stages, fecundity, survival, sex ratio, and heterosis. RESULTS: Although hybridization occcurred, with heterosis during the development of immatures, reproductive incompatibilities also were observed between the parental species and between hybrids from subsequent crosses. The interspecific crosses between hybrids and backcrosses confirmed the possibility of introgression events and their perpetuation in field populations. The results indicate that hybridization events are favored at high population levels, while at low population levels the 'species identities' will be maintained. CONCLUSIONS:The possibility of interspecific gene flow and its perpetuation through successive crosses and backcrosses suggests several recommenations for management. Populations of both species should be maintained at an equilibrium level to reduce the chance of interspecific crosses, which are presumably more likely to occur during pest outbreaks. The existence of hybridization and resistance to different active pesticide ingredients should be monitored. All practices related to managing the resistance of these pests to chemical and biological insecticides should be systematized to reduce the chance of selecting for resistant individuals.

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Section: Discussionmentioning

confidence: 99%

Helicoverpa armigera and Helicoverpa zea hybridization: constraints, heterosis, and implications for pest management

Rios

Specht

Roque–Specht

et al. 2021

Pest Management Science

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“…In Iran, 36 parasitoids have been reported to be associated with immature forms of H. armigera, with natural biological control levels ranging from 5 to 80%, depending on the crop and the stage of development in which the pest is found (Fathipour & Sedaratian, 2013). In Brazil, the natural occurrence in H. armigera caterpillars of Archytas marmoratus (Townsend, 1915) (Diptera: Tachinidae) (Guerra et al, 2014) and Campoletis sonorensis (Cameron, 1886) (Hymenoptera: Ichneumonidae), A. incertus (Macquart, 1851) (Diptera: Tachinidae) parasitoids has been recorded, associated with H. armigera, in which the larval parasitism rate was higher than 41% in areas of structured cotton refuge, without the use of chemical insecticides (Luz et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Potential of the Parasitoid Tetrastichus howardi (Olliff, 1893) (Hymenoptera: Eulophidae) on the Control of Helicoverpa armigera (Hübner, 1805) (Lepidoptera: Noctuidae)

Simonato¹,

Oliveira²,

Grigolli³

et al. 2020

JAS

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Helicoverpa armigera (Hubner, 1805) (Lepidoptera: Noctuidae) is an insect pest that attacks several cultures and has been a cause of concern in Brazil. The objective of this study was to evaluate parasitism in pupae and caterpillars of H. armigera by Tetrastichus howardi (Olliff, 1893) (Hymenoptera: Eulophidae), in laboratory, as well as checking if T. howardi parasitoid has the ability to locate and infect H. armigera. In the laboratory, pupae of H. armigera and Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) were exposed to 15 T. howardi females for 24 hours. Third, fourth and fifth instars of H. armigera were exposed to three T. howardi females for 24 hours. In the field experiment, cages were installed. Ten caterpillars of the fifth instar of H. armigera were released in each cage and waited for the necessary period for them to soak in the soil. After this period, 150 T. howardi females were released in each of four cages and in one cage there was no release of parasitoids. In the laboratory, the percentage of parasitized and emergent pupae was 100% in both hosts. The life cycle of T. howardi in H. armigera pupae was 15 days, and for D. saccharalis it was 16 days. The progeny was significantly larger for the host H. armigera (689.00) compared to D. saccharalis (358.27). The sex ratio was 0.91 and 0.87 for H. armigera and D. saccharalis, respectively. The longevity of males (25.60 days) and females (26.95 days) in the treatment with H. armigera differed from the treatment with D. saccharalis, which was 21.70 days for males and 22.95 days for females. For the experiment with H. armigera caterpillars, it was found that only two caterpillars from the fifth instar were parasitized with emergence of parasitoids in the pupal phase, with a progeny of 81 individuals; egg-adult cycle was 19.5 days; sex ratio of 0.88; male longevity was 19.6 days and for females 20.3 days. Despite the high rate of parasitism of T. howardi in H. armigera pupae in the laboratory, the same did not occur for caterpillars. In the field evaluation, of the total of 50 caterpillars released in the cages, 34 pupae were collected. Of these, 31 pupae had emergence of the H. armigera moth. No parasitism by T. howardi was found in H. armigera pupae. Further studies should be conducted to evaluate T. howardi parasitism in H. armigera pupae under field conditions.

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Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in Brazil: the Big Outbreak Monitored by Light Traps

et al. 2021

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Parasitoides associados com Helicoverpa armigera em áreas de refúgio de algodão, no Oeste da Bahia, Brasil

Cited by 3 publications

References 11 publications

Helicoverpa armigera and Helicoverpa zea hybridization: constraints, heterosis, and implications for pest management

Helicoverpa armigera and Helicoverpa zea hybridization: constraints, heterosis, and implications for pest management

Potential of the Parasitoid Tetrastichus howardi (Olliff, 1893) (Hymenoptera: Eulophidae) on the Control of Helicoverpa armigera (Hübner, 1805) (Lepidoptera: Noctuidae)

Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in Brazil: the Big Outbreak Monitored by Light Traps

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