Establishment of a silverleaf whitefly, <i>Bemisia tabaci</i> (Gennadius) (Hemiptera: Aleyrodidae) population in western Sydney

A survey of the endemic parasitoids of whiteflies in the greenhouse cropping regions of western Sydney was conducted from 13 October 2005 to 15 March 2007. The fourth-instar nymphs of both Bemisia tabaci (Aleyrodidae), including silverleaf whitefly (Bemisia tabaci biotype B), and greenhouse whitefly (Trialeurodes vaporariorum, Aleyrodidae) were collected from weeds surrounding greenhouses. These nymphs were incubated until the emergence of either a whitefly or parasitoid and the parasitoids were then identified. Eight species of parasitoids from two genera were detected in this survey (Encarsia accenta, E. formosa, E. mineoi, E. pergandiella, Eretmocerus queenslandensis, Eret. warrae, Eret. mundus and Eret. hayati). Five of these species were known parasitoids of silverleaf whitefly; one is a known parasitoid of greenhouse whitefly with two species known to parasitise both hosts. The presence of Eret. hayati is of particular interest because it has never been deliberately released into the surveyed region. Of these parasitoids, Eret. mundus and Eret. hayati are probably the most suitable candidates for biological control of whitefly associated with greenhouse crops in western Sydney.

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“…The presence of Eret. hayati supports findings that SLW is well established in the Sydney Basin (Childs et al . 2009) because Eret.…”

Section: Resultssupporting

confidence: 85%

“…The presence of the silverleaf whitefly (SLW) ( Bemisia tabaci (Gennadius) Biotype B, Hemiptera: Sternorrhyncha, Aleyrodidae) in the Sydney Basin presents challenges to the current pest management practices in the region (Childs et al . 2009).…”

Section: Introductionmentioning

confidence: 99%

Parasitoids of economically important whiteflies associated with greenhouse vegetable crops in western Sydney

Childs

Gunning

Mansfield

2011

Australian Journal of Entomology

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“…The species complex is widely distributed globally from tropical to temperate climates 2 . In Australia, B. tabaci MEAM1 is a well‐established pest of horticultural crops – both field and protected cropping as well as broad acre crops – primarily cotton and soybeans 3,4 …”

Section: Introductionmentioning

confidence: 99%

“…2 In Australia, B. tabaci MEAM1 is a well-established pest of horticultural cropsboth field and protected cropping as well as broad acre cropsprimarily cotton and soybeans. 3,4 As a result of their pest status and a history of developing resistance to insecticides, 5 B. tabaci MED and B. tabaci MEAM1 have been the focus of several insecticide resistance management (IRM) strategies [6][7][8][9][10] and integrated pest management (IPM) programs. [11][12][13][14][15] Adoption of selective insecticides, such as insect growth regulators (IGRs), the use of rotations between different insecticide modes-of-action (MoAs), 16 and the conservation of natural enemies are common themes in these programs.…”

Section: Introductionmentioning

confidence: 99%

Insecticide resistance management of Bemisia tabaci (Hemiptera: Aleyrodidae) in Australian cotton – pyriproxyfen, spirotetramat and buprofezin

Hopkinson

Balzer

Fang

et al. 2023

Pest Management Science

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BACKGROUND: Bemisia tabaci is a globally significant agricultural pest including in Australia, where it exhibits resistance to numerous insecticides. With a recent label change, buprofezin (group 16), is now used for whitefly management in Australia. This study investigated resistance to pyriproxyfen (group 7C), spirotetramat (group 23) and buprofezin using bioassays and available molecular markers.RESULTS: Bioassay and selection testing of B. tabaci populations detected resistance to pyriproxyfen with resistance ratios ranging from 4.1 to 56. Resistance to spirotetramat was detected using bioassay, selection testing and sequencing techniques. In populations collected from cotton, the A2083V mutation was detected in three populations of 85 tested, at frequencies ≤4.1%, whereas in limited surveillance of populations from an intensive horticultural region the frequency was ≥75.8%. The baseline susceptibility of B. tabaci to buprofezin was determined from populations tested from 2019 to 2020, in which LC 50 values ranged from 0.61 to 10.75 mg L −1 . From the bioassay data, a discriminating dose of 200 mg L −1 was developed. Recent surveillance of 16 populations detected no evidence of resistance with 100% mortality recorded at doses ≤32 mg L −1 . A crossresistance study found no conclusive evidence of resistance to buprofezin in populations with high resistance to pyriproxyfen or spirotetramat.CONCLUSIONS: In Australian cotton, B. tabaci pest management is challenged by ongoing resistance to pyriproxyfen, while resistance to spirotetramat is an emerging issue. The addition of buprofezin provides a new mode-of-action for whitefly pest management, which will strengthen the existing insecticide resistance management strategy.

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“…2004). A recent survey found silverleaf whitefly throughout the year on greenhouse vegetable crops in western Sydney (Childs et al . 2009) and there have been outbreaks of this pest in Narrabri and the Riverina (McDougall 2009).…”

Section: Introductionmentioning

confidence: 99%

Sampling protocol to detect Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) in mixed species populations in greenhouse vegetable crops

Spinner

Mansfield

Pilkington³

et al. 2011

Australian Journal of Entomology

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Current sampling protocols for pest whitefly in greenhouse cropping systems are not adequate for detection of Bemisia tabaci when it is part of a mixed species population. Greenhouse vegetable and flower crops in the north, west and south of Sydney were sampled for fourth-instar whitefly nymphs in autumn, winter and spring of 2007. Bemisia tabaci was found in all regions: in the north in winter, the west in all seasons and the south in autumn and winter. A comparison of a Poisson model for pest abundance and a binomial model of presence/absence showed the same factors to be significant, indicating that it is sufficient to sample for presence/absence of the pest on individual plants, rather than to measure pest abundance per plant. A model using the binomial distribution determined that if more than 20% of plants are infested with B. tabaci, a sample size of 20 whole plants per greenhouse is sufficient to detect the presence of B. tabaci with greater than 95% confidence.a en_819 276..280

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Establishment of a silverleaf whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) population in western Sydney

Cited by 4 publications

References 20 publications

Parasitoids of economically important whiteflies associated with greenhouse vegetable crops in western Sydney

Parasitoids of economically important whiteflies associated with greenhouse vegetable crops in western Sydney

Insecticide resistance management of Bemisia tabaci (Hemiptera: Aleyrodidae) in Australian cotton – pyriproxyfen, spirotetramat and buprofezin

Sampling protocol to detect Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) in mixed species populations in greenhouse vegetable crops

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