Journal ArticleDOI
Monitoring of spirodiclofen susceptibility in field populations of European red mites, Panonychus ulmi (Koch) (Acari: Tetranychidae), and the cross‐resistance pattern of a laboratory‐selected strain
Tina Kramer,Ralf Nauen +1 more
Reads0
Chats0
TLDR
The efficacy situation should be continuously monitored, and it is suggested that spirodiclofen be alternated with acaricides coming from different mode-of-action classes to reduce the selection pressures imposed on other life stages.Abstract:
BACKGROUND: Phytophagous mites such as the European red mite, Panonychus ulmi (Koch), are serious pests in European fruit tree orchards, and a number of acaricides are frequently used to control them. Spirodiclofen (Envidor®) has been a commonly used acaricide for several years. In the present study, European field populations collected in 2009 and 2010 were checked for their susceptibility to spirodiclofen by using discriminating dose and full dose response bioassays.
RESULTS: In 2009 and 2010, a total of 63 field populations (including winter eggs) of European red mites were collected in different European countries, and in several populations from south-western Germany a shifting in susceptibility against spirodiclofen was observed. Full dose response bioassays on different developmental stages of field-collected strains suggested an age-dependent expression of resistance because eggs remain fully susceptible to spirodiclofen. Artificial selection with spirodiclofen of one of the field strains resulted in resistance ratios of > 7000. Synergism studies suggest a possible role of cytochrome-P450-dependent monooxygenases in spirodiclofen detoxification. Most of the other acaricides from different chemical classes displayed no or low cross-resistance in a spirodiclofen-selected strain.
CONCLUSION: In order to preserve spirodiclofen as an important tool in spider mite resistance management, the efficacy situation should be continuously monitored, and it is suggested that spirodiclofen be alternated with acaricides coming from different mode-of-action classes. An observed age-specific expression of resistance revealed full susceptibility of eggs, so targeting spirodiclofen particularly against eggs is likely to reduce the selection pressures imposed on other life stages. Copyright © 2011 Society of Chemical Industryread more
Citations
More filters
Journal ArticleDOI
The economic importance of acaricides in the control of phytophagous mites and an update on recent acaricide mode of action research
TL;DR: An analysis of the global acaricide market reveals that spider mites are by far the most economically important species, representing more than 80% of the market, and major shifts in acaricides use are partially driven by resistance development and the commercial availability of compounds with novel mode of action.
Journal ArticleDOI
Molecular analysis of resistance to acaricidal spirocyclic tetronic acids in Tetranychus urticae: CYP392E10 metabolizes spirodiclofen, but not its corresponding enol.
Peter Demaeght,Wannes Dermauw,Dimitra Tsakireli,Jahangir Khajehali,Ralf Nauen,Luc Tirry,John Vontas,Peter Lümmen,Thomas Van Leeuwen +8 more
TL;DR: Investigation of two genetically distant spider mite strains with high resistance to spirodiclofen found that expression levels were not significantly different between developing stages, but very low in eggs, matching the age-dependent resistance pattern previously observed.
Journal ArticleDOI
Acaricides in modern management of plant-feeding mites
TL;DR: The only sustainable, long-term perspective for acaricide use is their implementation in multitactic integrated pest management programs, in which acaricides are applied highly rationally and in interaction with other control tactics.
Journal ArticleDOI
The relative contribution of target-site mutations in complex acaricide resistant phenotypes as assessed by marker assisted backcrossing in Tetranychus urticae
Maria Riga,Maria Riga,Sabina Bajda,Christos Themistokleous,Stavrini Papadaki,Maria Palzewicz,Wannes Dermauw,John Vontas,John Vontas,Thomas Van Leeuwen,Thomas Van Leeuwen +10 more
TL;DR: This study functionally validates reported target-site resistance mutations in T. urticae, by uncoupling them from additional mechanisms, allowing to finally investigate the strength of the conferred phenotype in vivo.
Journal ArticleDOI
Over-expression of CYP6A2 is associated with spirotetramat resistance and cross-resistance in the resistant strain of Aphis gossypii Glover.
Tianfei Peng,Yiou Pan,Yang Chen,Xiwu Gao,Jinghui Xi,Yongqiang Wu,Xiao Huang,E. Zhu,Xin Xuecheng,Chao Zhan,Qingli Shang +10 more
TL;DR: Results indicate the possible involvement of CYP6A2 in spirotetramat resistance and alpha-cypermethrin cross-resistance in the cotton aphid and have implications for the successful implementation of resistance management strategies for Aphis gossypii.
References
More filters
Journal ArticleDOI
A method of computing the effectiveness of an insecticide
TL;DR: In order to make experimental studies comparable and statistically meaningful, the article recommends the following formula: per cent control = 100(X - Y)/X, which eliminates errors due to deaths in the control sample which were not due to the insecticide.
BookDOI
Mites injurious to economic plants
TL;DR: This timely volume provides an authoritative digest of all the available information on the mites (Acarina) known to produce injury to plants of economic importance.
Journal ArticleDOI
Acaricide resistance mechanisms in the two-spotted spider mite Tetranychus urticae and other important Acari: A review
Journal ArticleDOI
Acaricide mode of action
TL;DR: Pyridaben, acequinocyl, diafenthiuron, etoxazole, spirodiclofen and bifenazate are acaricides that are safe to beneficials, have low mammalian toxicity and short environmental persistence.
Journal ArticleDOI
Biochemical Markers Linked to Abamectin Resistance in Tetranychus urticae (Acari: Tetranychidae)
Natascha Stumpf,Ralf Nauen +1 more
TL;DR: This paper is the first attempt to biochemically describe abamectin resistance in T. urticae, a two-spotted spider mite from the Netherlands, using a diagnostic dose and confirmed by synergism studies with the MFO inhibitor piperonyl butoxide and the GST inhibitor diethyl maleate.
Related Papers (5)
IRAC: Mode of action classification and insecticide resistance management
Thomas C. Sparks,Ralf Nauen +1 more