Autor: |
Jagadeesan R; Department of Agriculture and Fisheries, Ecosciences Precinct, Brisbane, Australia., Singarayan VT; School of Biological Sciences, The University of Queensland, St Lucia, Australia., Nayak MK; Department of Agriculture and Fisheries, Ecosciences Precinct, Brisbane, Australia. |
Jazyk: |
angličtina |
Zdroj: |
Pest management science [Pest Manag Sci] 2021 Sep; Vol. 77 (9), pp. 4009-4015. Date of Electronic Publication: 2021 May 25. |
DOI: |
10.1002/ps.6424 |
Abstrakt: |
Background: Managing resistance to phosphine (PH 3 ) in rusty grain beetle, Cryptolestes ferrugineus, is challenging, as strongly resistant insects of this species require very high concentrations over lengthy exposure periods (>10 days). Recently, approaches that enhance the efficacy of PH 3 have gained momentum to control this pest, especially co-fumigations. In this study, efficacy of co-fumigating PH 3 with another commercially available fumigant, sulfuryl fluoride (SF), has been evaluated against adults and eggs of two PH 3 -resistant strains of C. ferrugineus. Concentrations of the mixture, representing lower than current application rates of both fumigants, were tested towards its field use. Results: Co-fumigation of PH 3 with SF was achieved in two patterns: over a continuous exposure period of 168 h simultaneously and sequentially over two periods of 78 h, in which insects were exposed to SF first followed by PH 3 with 12 h aeration in-between. Results of simultaneous fumigations identified two effective co-fumigation rates, SF 185 + PH 3 168 g hm -3 and SF 370 + PH 3 84 g hm -3 that yielded complete control of adults and eggs. These two rates also were equally effective when they were applied sequentially and produced consistent results. Irrespective of application methods, concentrations of both PH 3 and SF failed individually in achieving complete mortality of either adults or eggs or both. Conclusion: Our results confirmed that a co-fumigation strategy involving half the current standard rate of PH 3 (84 g hm -3 ) with one-fourth of the current maximal registered rate of SF (370 g hm -3 ) can provide effective control of strongly PH 3 -resistant C. ferrugineus. (© 2021 State of Queensland. Pest Management Science © 2021 Society of Chemical Industry.) |
Databáze: |
MEDLINE |
Externí odkaz: |
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