Survival of immature <i>Helicoverpa punctigera</i> (Wallengren) (Lepidoptera: Noctuidae) on some C4 and C3 plants

Bawa, Samuel A.; Gregg, Peter; Socorro, Alice P Del; Miller, Cara; Andrew, Nigel R.

doi:10.1111/aen.12563

Cited by 2 publications

(2 citation statements)

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“…This is consistent with known host preferences for H. punctigera ( Cunningham and Zalucki 2014 ). Larvae of H. punctigera do not survive on sorghum, and, although H. punctigera moths with the C4 host profile are sometimes found in cropping regions ( Baker et al 2019 ) and there are noncrop C4 hosts that can support larvae ( Bawa et al 2021 ), there were almost no H. punctigera with the C4 profile in these experiments.…”

Section: Discussionmentioning

confidence: 78%

“…Stable carbon isotope ratios were determined using techniques described by Baker and Tann 2013 to ascertain whether they originated from larvae fed on plants with the C3 photosynthetic pathway (including cotton) or from plants with the C4 pathway. In the curative experiment only, H. armigera moths were tested for host plant origin because it was considered that H. punctigera had no C4 host plants, but, for the preventive experiment, recent evidence ( Baker et al 2019 , Bawa et al 2021 ) had required a revision of this assumption, so both species were tested.…”

Section: Methodsmentioning

confidence: 99%

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Bisexual Attract-and-Kill: A Novel Component of Resistance Management for Transgenic Cotton in Australia

Gregg

Socorro

Wilson

et al. 2022

Journal of Economic Entomology

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In Australia, destruction of overwintering pupae of Helicoverpa armigera (Hübner) and Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) has been a key component of mandatory resistance management schemes to constrain development of resistance to Bt toxins in transgenic cotton. This has been accomplished by tillage (‘pupae busting’), but it is expensive and can interfere with farming operations. Bisexual attract-and-kill technology based on plant volatile formulations offers a potential alternative in some circumstances. We discuss strategies for using such products and describe two trials in which three applications of an attract-and-kill formulation substantially reduced the numbers of Helicoverpa spp. moths and the numbers of potentially overwintering eggs they laid. One trial tested a curative strategy in which the last generation of moths emerging from transgenic cotton was targeted. The other tested a preventive strategy which aimed to reduce the numbers of eggs in the last generation. The preventive strategy reduced egg numbers by about 90% and is now included as an optional alternative to pupae busting in resistance management strategies for Australian cotton. It is limited to fields which have not been defoliated prior to 31 March and was developed to be used primarily in southern New South Wales. In the 2020–2021 cotton season, it was adopted on approximately 60% of the eligible cotton area. We describe the process whereby the strategy was developed in collaboration with the transgenic technology provider, supported by the cotton industry, and approved by the regulatory authority.

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Section: Discussionmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Bisexual Attract-and-Kill: A Novel Component of Resistance Management for Transgenic Cotton in Australia

Gregg

Socorro

Wilson

et al. 2022

Journal of Economic Entomology

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Oviposition preferences of the native budworm,

Bawa

Gregg

Socorro

et al. 2021

Crop & Pasture Science

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The native budworm, Helicoverpa punctigera (Wallengren), is an important economic insect pest of cotton and other crops. It is widely distributed in Australia and has been recorded on a range of host plants including native, non-crop hosts in inland regions. To date, there are few records of its occurrence on plants with the C4 photosynthetic pathway. Here, we assessed the oviposition preferences of H. punctigera for naturally occurring C3 and C4 plants under glasshouse conditions, to establish their potential as hosts. We conducted bioassays on two C4 plants, saltbushes Atriplex nummularia Lindl. and Atriplex vesicaria Heward ex Benth.; and two C3 plants, legumes Medicago polymorpha L. (burr medic) and Cullen cinereum (Lindl.) J.W.Grimes (annual verbine). The two C4 plants attract egg laying in the field; however, C3 plants are the preferred hosts. Ovipositing females showed a preference for the C3 over the C4 plants but oviposition occurred on both. Of the C4 plants, females preferred to oviposit on A. nummularia (77%) over A. vesicaria (24%) in both a multi- and two-choice test. In addition, ovipositing females preferred the upper leaf surface of A. nummularia (68%) and the under leaf surface of A. vesicaria (64%) as their oviposition site. Our findings suggest that under field conditions, when C4 plants such as saltbushes grow near C3 plants, as occurs in inland regions, the C4 plants could receive eggs along with the C3 plants, enabling the initial stages of larval recruitment to occur in C3 plants.

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Survival of immature Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) on some C4 and C3 plants

Cited by 2 publications

References 32 publications

Bisexual Attract-and-Kill: A Novel Component of Resistance Management for Transgenic Cotton in Australia

Bisexual Attract-and-Kill: A Novel Component of Resistance Management for Transgenic Cotton in Australia

Oviposition preferences of the native budworm,

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