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Hoffmann, Ary A.; Porter, Stephanie S.; Kovacs, Ingrid

doi:10.1023/a:1018482502080

Cited by 44 publications

(7 citation statements)

References 13 publications

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“…The increasing application of pesticides places enormous selection pressure on species to develop resistance. Hoffmann et al (1997) provided evidence of some tolerance in H. destructor populations in Victoria to an organophosphate chemical ( Table 1). They predicted future problems with pesticide resistance in H. destructor and suggested that a reduction in the use of pesticides and dependence on this one control method was needed.…”

Section: Development Of Resistance To Pesticidesmentioning

confidence: 97%

“…Because gene flow is likely to occur between H. destructor populations (Weeks et al 1995;Qin 1997), resistance alleles could be spreading throughout the range of this species without the resistance being expressed, and the resistance to synthetic pyrethroids may become a much broader problem. It is encouraging that, at this stage, resistance appears to be confined to synthetic pyrethroids (Umina 2007), although resistance to other commonly used chemical classes could arise in the future (Hoffmann et al 1997). Integrated strategies for H. destructor should aim to reduce the risk of developing resistance.…”

Section: Integrated Managementmentioning

confidence: 99%

“…There is currently no recorded resistance to organophosphates. In view of the very high densities that H. destructor reach in the field (Ridsdill-Smith and Annells 1997) and the high selection pressure imposed on this species (Hoffmann et al 1997;Ridsdill-Smith 1997) it is surprising that chemical resistance in H. destructor has not been demonstrated earlier.…”

Section: Development Of Resistance To Pesticidesmentioning

confidence: 99%

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Strategies for control of the redlegged earth mite in Australia

Ridsdill-Smith¹,

Hoffmann²,

Mangano³

et al. 2008

Aust. J. Exp. Agric.

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The redlegged earth mite, Halotydeus destructor, continues to be an intractable pest causing damage to most crop and pasture species in southern Australia. H. destructor feed on all stages of plants, but particularly damage seedlings in autumn. Research has aimed to develop new controls based on a better understanding of the biology and ecology of this pest. Chemicals remain the key tool to control H. destructor, despite the recent appearance of resistance to synthetic pyrethroids. A control package, Timerite, has been developed by which a single well-timed spray in spring can prevent H. destructor from developing diapause eggs. Field trials show this strategy provides effective control of H. destructor the following autumn, and protects plant seedlings, although mite populations build up again during winter. Non-chemical control strategies include grazing, the use of tolerant plants such as cereals, resistant legume cultivars and avoiding rotations where favourable host plants are available in the year before growing susceptible crops such as canola. Natural enemies can assist in mite control, and their numbers can be enhanced by methods including increasing landscape features like shelterbelts. Interspecific competition can occur between H. destructor and other pest mites, but the extent to which these interactions influence the structure of pest communities under different management regimes remains to be investigated.

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Section: Development Of Resistance To Pesticidesmentioning

confidence: 97%

Section: Integrated Managementmentioning

confidence: 99%

Section: Development Of Resistance To Pesticidesmentioning

confidence: 99%

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Strategies for control of the redlegged earth mite in Australia

Ridsdill-Smith¹,

Hoffmann²,

Mangano³

et al. 2008

Aust. J. Exp. Agric.

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“…Pyrethroid and organophosphate pesticides have been important in the control of H. destructor for many decades (Arthur et al, 2021 ; Umina et al, 2019 ). Tolerance to pesticides was first reported in the late 1990s and early 2000s (Hoffmann et al, 1997 ; Robinson & Hoffmann, 2000 ), with pyrethroid resistance first detected in field populations in 2006 (Umina, 2007 ) and organophosphate resistance first detected in 2014 (Umina et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

The redlegged earth mite draft genome provides new insights into pesticide resistance evolution and demography in its invasive Australian range

Thia

Korhonen

Young

et al. 2022

J of Evolutionary Biology

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Genomic data provide valuable insights into pest management issues such as resistance evolution, historical patterns of pest invasions and ongoing population dynamics. We assembled the first reference genome for the redlegged earth mite, Halotydeus destructor (Tucker, 1925), to investigate adaptation to pesticide pressures and demography in its invasive Australian range using whole‐genome pool‐seq data from regionally distributed populations. Our reference genome comprises 132 autosomal contigs, with a total length of 48.90 Mb. We observed a large complex of ace genes, which has presumably evolved from a long history of organophosphate selection in H. destructor and may contribute towards organophosphate resistance through copy number variation, target‐site mutations and structural variants. In the putative ancestral H. destructor ace gene, we identified three target‐site mutations (G119S, A201S and F331Y) segregating in organophosphate‐resistant populations. Additionally, we identified two new para sodium channel gene mutations (L925I and F1020Y) that may contribute to pyrethroid resistance. Regional structuring observed in population genomic analyses indicates that gene flow in H. destructor does not homogenize populations across large geographic distances. However, our demographic analyses were equivocal on the magnitude of gene flow; the short invasion history of H. destructor makes it difficult to distinguish scenarios of complete isolation vs. ongoing migration. Nonetheless, we identified clear signatures of reduced genetic diversity and smaller inferred effective population sizes in eastern vs. western populations, which is consistent with the stepping‐stone invasion pathway of this pest in Australia. These new insights will inform development of diagnostic genetic markers of resistance, further investigation into the multifaceted organophosphate resistance mechanism and predictive modelling of resistance evolution and spread.

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“…For the purposes of the current study, we were only interested in those treatments where mites were held at 4 °C prior to testing and incubated at 18 °C during pesticide exposure (i.e., acclimation treatment = ‘Acclim cool’ and test treatment = ‘Test warm’; see Thia et al 2022b ). This is the standard methodology for pesticide laboratory bioassays involving H. destructor (Hoffmann et al 1997 ; Umina 2007 ; Maino et al 2018 ). We re-analysed these chemical response data via binomial logistic regression models using the lme4 package in R (Bates et al 2015 ).…”

Section: Methodsmentioning

confidence: 99%

From laboratory to field: laboratory-measured pesticide resistance reflects outcomes of field-based control in the redlegged earth mite, Halotydeus destructor

Umina

McGrane²,

Thia

et al. 2023

Exp Appl Acarol

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Resistance to pesticides is typically identified via laboratory bioassays after field control failures are observed, but the results of such assays are rarely validated through experiments under field conditions. Such validation is particularly important when only a low-to-moderate level of resistance is detected in the laboratory. Here we undertake such a validation for organophosphate resistance in the agricultural pest mite Halotydeus destructor, in which low-to-moderate levels of resistance to organophosphorus pesticides have evolved in Australia. Using data from laboratory bioassays, we show that resistance to the organophosphate chlorpyrifos is higher (around 100-fold) than resistance to another organophosphate, omethoate (around 7-fold). In field trials, both these chemicals were found to effectively control pesticide-susceptible populations of H. destructor. However, when applied to a resistant mite population in the field, the effectiveness of chlorpyrifos was substantially decreased. In contrast, omethoate remained effective when tested alone or as a mixture with chlorpyrifos. We also show that two novel (non-pesticide) treatments, molasses and wood vinegar, are ineffective in controlling H. destructor when sprayed to pasture fields at rates of 4 L/ha. These findings suggest a close link between levels of resistance quantified through laboratory bioassays and the field effectiveness of pesticides; however, in the case of H. destructor, this does not necessarily mean all field populations possessing organophosphate resistance will respond similarly given the potentially complex nature of the underlying resistance mechanism(s).

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Untitled

Cited by 44 publications

References 13 publications

Strategies for control of the redlegged earth mite in Australia

Strategies for control of the redlegged earth mite in Australia

The redlegged earth mite draft genome provides new insights into pesticide resistance evolution and demography in its invasive Australian range

From laboratory to field: laboratory-measured pesticide resistance reflects outcomes of field-based control in the redlegged earth mite, Halotydeus destructor

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