Polyphagy in an uncertain environment: <i>Helicoverpa punctigera</i>
 in inland Australia

Gregg, Peter; Henderson, G. S.; Socorro, Alice P Del; Mottee, Kris Le; Birchall, Craig

doi:10.1111/aec.12374

Cited by 16 publications

(35 citation statements)

References 25 publications

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“…6). They can therefore sometimes serve as refuges, where H. punctigera populations can persist and later colonise other habitats (Gregg et al 2016). In the eastern floodplains of the Murray-Darling, the most abundant hosts are Medicago spp.…”

Section: The Roles Of Habitats For Inland Helicoverpa Punctigera Popumentioning

confidence: 99%

“…This means that the floodplains are often devoid of vegetation, or support only dry grasses, but when they are green, they can support hosts even when no local rain has fallen. They can therefore sometimes serve as refuges, where H. punctigera populations can persist and later colonise other habitats (Gregg et al 2016).…”

Section: The Roles Of Habitats For Inland Helicoverpa Punctigera Popumentioning

confidence: 99%

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Host plants and habitats of Helicoverpa punctigera and H. armigera (Lepidoptera: Noctuidae) in inland Australia

et al. 2018

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For Helicoverpa punctigera (Wallengren), and to a lesser extent Helicoverpa armigera (Hübner), native host plants in non-cropping regions of inland Australia are believed to be contributors to populations which migrate in spring to infest cropping regions of south-east Australia, and southwestern Australia. Non-crop hosts were sampled using sweep nets in 71 survey trips in 19 years between 1987 and 2017 for larvae of H. punctigera and H. armigera, over about 2.4 million km 2 in inland Australia. Of 1976 samples, H. punctigera larvae were present in 50.5%, distributed throughout the study area. Larvae were found on 106 host plant species in 24 families, including 61 new host records. H. armigera larvae were found on 33 plant species from eight families, including 14 new host records. However, only 4.3% of samples were positive for this species, and they were mostly in the east of the study area and had fewer larvae than the positive H. punctigera samples. H. punctigera larvae were found in each of six habitats, being, in order of mean numbers per sample: sandy deserts > floodplains > mulga, grasslands and saltbush > stony downs. Host status was determined for both species by plotting relative incidence against relative abundance, and the good hosts for H. punctigera differed between habitats. We discuss the value and limitations of this approach for identifying key hosts in broad scale population dynamics, and primary hosts which may have close co-evolutionary histories with the insects.

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Section: The Roles Of Habitats For Inland Helicoverpa Punctigera Popumentioning

confidence: 99%

Section: The Roles Of Habitats For Inland Helicoverpa Punctigera Popumentioning

confidence: 99%

Host plants and habitats of Helicoverpa punctigera and H. armigera (Lepidoptera: Noctuidae) in inland Australia

et al. 2018

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“…1986, 1994; Gregg et al . 2016, 2019) and were therefore often surveyed. Other native plants that were surveyed for Helicoverpa spp.…”

Section: Methodsmentioning

confidence: 99%

Long‐term changes and host plant differences in the incidence of parasitoids attacking Helicoverpa spp. (Lepidoptera: Noctuidae) in agricultural landscapes in eastern Australia

Baker

Tann

2020

Austral Entomology

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Transgenic (Bt) varieties have improved the control of key insect pests, Helicoverpa spp. (Noctuidae), and reduced pesticide use within Australian cotton crops. Approval to use Bt cotton varieties in Australia required assurance that they would have no significant adverse impact on non-target invertebrates resident in cotton fields. However, little is known of any influences that Bt cotton might have on non-target invertebrates, especially beneficial species, found elsewhere in cotton production landscapes. We collected large numbers of Helicoverpa eggs, larvae and pupae in various major crop types in several cotton production regions in eastern Australia over 26 years and reared them to determine parasitoid frequencies. In addition, more limited collections were made on minor crops, exotic weeds and native vegetation (the latter also surveyed in inland Australia). The most common parasitoids found in crops included Trichogramma spp. and Chelonus spp. (for eggs), Microplitis demolitor, Heteropelma scaposum, Chaetophthalmus sp. and Carcelia sp. (for larvae) and H. scaposum and Ichneumon promissorius (for pupae). Larval parasitoid communities on weeds were similar to those found on crops. Greater parasitoid frequencies were often found in eggs, larvae and pupae of Helicoverpa in crops surveyed after the advent of Bt cotton, compared with earlier years. Similar patterns were found for larvae on the common weed, Echium plantagineum, and native daisies (Asteraceae). No negative associations involving parasitoids and the use of Bt cotton were found.

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“…H. armigera also seems likely to move at scales much greater than landscapes, given that little genetic structure has been found throughout broad areas of Australia, implying high gene flow between populations in geographically distinct regions (Daly & Gregg, 1985;Endersby et al, 2007;Weeks et al, 2010; but also see Scott et al, 2005Scott et al, , 2006 and earlier papers cited therein). Both moth species feed on a large range of exotic weeds, native plants (especially H. punctigera) and agricultural crops (Fitt, 1989;Zalucki et al, 1986Zalucki et al, , 1994Walter & Benfield, 1994;Fitt & Cotter, 2004;Rajapakse & Walter, 2007;Cunningham & Zalucki, 2014;Gregg et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…the plants in the Australian mulga ecosystems, which are common to inland areas where large populations of H. punctigera have been known to develop (Zalucki et al, 1986(Zalucki et al, , 1994Gregg et al, 1995) are predominantly C 3 (Pate et al, 1998). The majority of the known host plants for H. punctigera, at least in inland Australia, are likely to be C 3 (Zalucki et al, 1994;Sage & Monson, 1998;Gregg et al, 2016). Mattson (1980) and Ambika et al (2005) also suggested it might be possible to discriminate legumes and non-legumes using stable nitrogen isotope signatures ( 15 N, 14 N; hence delta N or δ 15 N), and Ye et al (2015) indeed used δ 15 N to discriminate the origins of H. armigera moths from within a group of C 3 host plants (cotton, soybean, and peanut) in China.…”

Section: Introductionmentioning

confidence: 99%

Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

Baker

Tann

Verwey

et al. 2018

Bull. Entomol. Res.

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The use of Bt cotton varieties has greatly reduced the amount of conventional insecticides required to control lepidopteran pests, Helicoverpa armigera and Helicoverpa punctigera, in Australia, but the possibility that these moths might become resistant to Bt remains a threat. Consequently, a Resistance Management Plan, which includes the mandatory growing of refuge crops (pigeon pea and non-Bt cotton; both C3 plants), has been established for Bt cotton farmers. However, knowledge of the relative contributions made to overall moth populations from the many host origins (both C3 and C4 plants) available to these insects throughout cotton production regions remains limited, as do the scales of movement and spatial mixing of moths within and between these areas. This study used stable isotope signatures (in particular δ13C) to help identify where moths fed as larvae within separate cotton production regions which differed in their proportions of C3 and C4 host crops (e.g. cotton and sorghum, respectively). C3-derived moths predominated in the early season, but C4-derived moths increased in frequency later. The overall proportion of C4 moths was higher in H. armigera than in H. punctigera. Whilst the relative proportions of C3 and C4 moths differed between regions, no differences in such proportiorns were found at smaller spatial scales, nor were there significant correlations between crop composition and isotope signatures in moths. Overall, these results suggest that C4 host plants are likely to be very important in offsetting the development of Bt resistance in these insects and such influences may operate across multiple regions within a single growing season.

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Polyphagy in an uncertain environment: Helicoverpa punctigera in inland Australia

Cited by 16 publications

References 25 publications

Host plants and habitats of Helicoverpa punctigera and H. armigera (Lepidoptera: Noctuidae) in inland Australia

Host plants and habitats of Helicoverpa punctigera and H. armigera (Lepidoptera: Noctuidae) in inland Australia

Long‐term changes and host plant differences in the incidence of parasitoids attacking Helicoverpa spp. (Lepidoptera: Noctuidae) in agricultural landscapes in eastern Australia

Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

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