Karyotypes and sex-determination in spider mites (Tetranychidae)

Helle, W.; Bolland, H.R.

doi:10.1007/bf01507446

Cited by 53 publications

(36 citation statements)

References 10 publications

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“…However, not much can be inferred for other compounds (such as fenpropathrin and chlorfenapyr) concerning cross-resistance with abamectin. The small number of chromosomes (n = 3) in T. urticae (Helle & Bolland 1967) increases the possibilities of multiple-resistance development. The selection with an acaricide (e.g.…”

Section: Discussionmentioning

confidence: 99%

Abamectin resistance in Tetranychus urticae Koch (Acari: Tetranychidae): selection, cross-resistance and stability of resistance

Sato¹,

Silva²,

Raga³

et al. 2005

Neotrop. Entomol.

133

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Neotropical Entomology 34(6): 991-998 (2005) Resistência de PALAVRAS-CHAVE: Ácaro rajado, manejo da resistência, controle químico ABSTRACT -Studies on artificial laboratory selections with abamectin, cross-resistance relationships, and stability of resistance were carried out with Tetranychus urticae Koch to provide basic information for an abamectin resistance management program. Selections for resistance and susceptibility to abamectin were performed in a population of T. urticae, collected from a commercial strawberry field in the State of São Paulo, Brazil. After five selections for resistance and five selections for susceptibility, susceptible (S) and resistant (R) strains of T. urticae to abamectin were obtained. The resistance ratio (R/S) at the LC 50 reached 342-fold values. The toxicity of eight acaricides was evaluated in the R and S strains, observing significant differences (at LC 50 ) between R and S strains for milbemectin, fenpropathrin and chlorfenapyr. Significant correlation was detected between the LC 50 s of abamectin and milbemectin, indicating cross-resistance between these acaricides. No crossresistance was detected for the acaricides fenpyroximate, cyhexatin, propargite and dimethoate. The stability of abamectin resistance was also studied under laboratory conditions. Abamectin resistance was unstable in the absence of selection pressure. For all studied populations (with 75, 50 and 25% of initial frequency of resistant mites), the percentage of resistant mites decreased to levels equal or lower than 15% in six months. The results indicate that milbemectin should be avoided for managing abamectin resistance in T. urticae.

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Section: Discussionmentioning

confidence: 99%

Abamectin resistance in Tetranychus urticae Koch (Acari: Tetranychidae): selection, cross-resistance and stability of resistance

Sato¹,

Silva²,

Raga³

et al. 2005

Neotrop. Entomol.

133

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show abstract

“…Genetically fixed mechanisms of pesticide resistance in spider mites were similar to those found in pest insects and include enhanced metabolic detoxification of acaricides through esterases, glutathione S-transferases or cytochrome P450-dependent monooxygenases, and/or a mutated target site conferring target site resistance (Knowles, 1997). Another important point when resistance-associated mutations occur in twospotted spider mites is their haplo-diploid breeding system (males are hemizygous off-spring of unmated females (Helle and Bolland, 1967)), promoting the evolution of acaricide resistance and thereby possibly contributing to the rapid fixation of resistance genes in populations (Devine et al, 2001).…”

Section: Introductionmentioning

confidence: 97%

Complete maternal inheritance of bifenazate resistance in Tetranychus urticae Koch (Acari: Tetranychidae) and its implications in mode of action considerations

Leeuwen

Tirry

Nauen

2006

Insect Biochemistry and Molecular Biology

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“…However, the identiÞcation of these mites is often difÞcult given their small size and lack of suitable morphological characters (Ros et al 2008). To compound this, numerous species within the genus Bryobia reproduce by thelytokous parthenogenesis (Norton et al 1993, Ros et al 2008, with males described from only a few species (Helle and Bolland 1967, Helle and Sabelis 1985, Ros et al 2008. Further complicating the taxonomy of this group is the intracellular bacterium Wolbachia.…”

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confidence: 97%

Genetic Markers Indicate a New Species Complex of Emerging Pest Mites in Australian Grains

Arthur

Miller

Weeks

2011

Annals of the Entomological Society of America

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Balaustium medicagoense Meyer & Ryke (Acari: Erythraeidae) and Bryobia spp. Koch (Acari: Tetranychidae) are significant emerging pests in Australian grains and pastures. Despite this, there is limited information known on their basic biology, such as species status and reproductive modes, making it difficult to develop effective and sustainable control strategies. The species/strain status of Balaustium and Bryobia mites from southern Australia was examined using a combination of mitochondrial and nuclear DNA sequence data. In addition, the amplified fragment length polymorphism (AFLP) method was used to examine the reproductive mode and genetic diversity of Ba. medicagoense from 16 populations within southern Australia. Results indicate that there is only one species of Balaustium (Ba. medicagoense) and as many as seven species of Bryobia mites currently present in grain crops, pastures and roadsides within southern Australia. The Bryobia species complex consists of four recently described lineages (Bryobia sp. I, Bryobia sp. IV, Bryobia sp. VII, and Bryobia praetiosa Koch) and three additional genetic lineages (Bryobia sp. VIII, Bryobia sp. IX, and Bryobia sp. X) that have not been described previously. Bryobia sp. VIII, B. sp. IX, and B. sp. I seem to be the most abundant species present in Australian broadacre agriculture (i.e., land suitable for farms practicing large-scale crop [agriculture] operations). The AFLP data revealed that Ba. medicagoense reproduces asexually and that genetic diversity was low with only 10 genotypes found. These findings indicate a new complex of pest mites are present within Australian grain crops and pastures and this has implications for their control.

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Karyotypes and sex-determination in spider mites (Tetranychidae)

Cited by 53 publications

References 10 publications

Abamectin resistance in Tetranychus urticae Koch (Acari: Tetranychidae): selection, cross-resistance and stability of resistance

Abamectin resistance in Tetranychus urticae Koch (Acari: Tetranychidae): selection, cross-resistance and stability of resistance

Complete maternal inheritance of bifenazate resistance in Tetranychus urticae Koch (Acari: Tetranychidae) and its implications in mode of action considerations

Genetic Markers Indicate a New Species Complex of Emerging Pest Mites in Australian Grains

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