Occurrence of the spider mite Tetranychus takafujii Ehara &amp; Ohashi in Kyushu and Okinawa.

香奈美, 池島; 祥孝, 坂巻; 聡子, 宮城; 豪, 大野; 健, 福田; 勝男, 津田

doi:10.4241/kyubyochu.55.136

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Since data on Tetranychus takafujii Ehara & Ohashi (ϭT. evansi Baker and Pritchard;see Gotoh et al, 2009) and T. phaselus Ehara, which have been found only on non-crop plants in Okinawa, are presented elsewhere (Ikeshima et al, 2009;Ohno et al, 2010), the present study treated the data for Tetranychus species other than these two species. New distribution records of mite species were determined by referring to Ohno et al (2009) and references therein.…”

Section: Methodsmentioning

confidence: 99%

Non-crop host plants of Tetranychus spider mites (Acari: Tetranychidae) in the field in Okinawa, Japan: Determination of possible sources of pest species and inference on the cause of peculiar mite fauna on crops

Ohno

Miyagi

Ganaha-Kikumura

et al. 2010

Appl. Entomol. Zool.

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The species composition of spider mites on crops in Okinawa is peculiar in that Tetranychus okinawanus and T. piercei are dominant on most islands, whereas T. urticae (green form) and T. kanzawai are not. To determine the source plants of Tetranychus species infesting crops, as well as to contribute to our understanding of the cause of this peculiar mite fauna, we collected Tetranychus mites on non-crop plants throughout Okinawa (more than 450 sites on 15 islands) and identified them. Except in the case of T. parakanzawai, the species frequently found on crops tended to occur frequently on non-crop plants, suggesting that the peculiar species composition on crops reflects that also on non-crop plants. T. parakanzawai has been rarely found on crops but frequently found on particular non-crop plants, possibly due to the narrower host range of this species. The type of host plants varied among mite species; for example, T. okinawanus was frequently found on indigenous plants inhabiting the seashore and invasive weeds, T. piercei and T. parakanzawai on inland indigenous plants, T. urticae (green form) on invasive weeds, and T. neocaledonicus on introduced trees. These results are of great significance when considering vegetation control as a tactic for the integrated management of spider mites.

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Section: Methodsmentioning

confidence: 99%

Non-crop host plants of Tetranychus spider mites (Acari: Tetranychidae) in the field in Okinawa, Japan: Determination of possible sources of pest species and inference on the cause of peculiar mite fauna on crops

Ohno

Miyagi

Ganaha-Kikumura

et al. 2010

Appl. Entomol. Zool.

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Tetranychusevansi spider mite populations suppress tomato defenses to varying degrees

Knegt

Meijer

Kant

et al. 2020

Ecology and Evolution

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Plant defense suppression is an offensive strategy of herbivores, in which they manipulate plant physiological processes to increase their performance. Paradoxically, defense suppression does not always benefit the defense-suppressing herbivores, because lowered plant defenses can also enhance the performance of competing herbivores and can expose herbivores to increased predation. Suppression of plant defense may therefore entail considerable ecological costs depending on the presence of competitors and natural enemies in a community. Hence, we hypothesize that the optimal magnitude of suppression differs among locations. To investigate this, we studied defense suppression across populations of Tetranychus evansi spider mites, a herbivore from South America that is an invasive pest of solanaceous plants including cultivated tomato, Solanum lycopersicum, in other parts of the world. We measured the level of expression of defense marker genes in tomato plants after infestation with mites from eleven different T. evansi populations. These populations were chosen across a range of native (South American) and non-native (other continents) environments and from different host plant species. We found significant variation at three out of four defense marker genes, demonstrating that T. evansi populations suppress jasmonic acid-and salicylic acid-dependent plant signaling pathways to varying degrees. While we found no indication that this variation in defense suppression was explained by differences in host plant species, invasive populations tended to suppress plant defense to a smaller extent than native populations. This may reflect either the genetic lineage of T. evansi-as all invasive populations we studied belong to one linage and both native populations to another-or the absence of specialized natural enemies in invasive T. evansi populations. K E Y W O R D S biotic interactions, herbivore offense, intraspecific variation, jasmonate reporter, Plantherbivore interactions, Solanum lycopersicum S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Knegt B, Meijer TT, Kant MR, Kiers ET, Egas M. Tetranychus evansi spider mite populations suppress tomato defenses to varying degrees. Ecol Evol.

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Susceptibility to acaricides in nine strains of the tomato red spider miteTetranychus evansi(Acari: Tetranychidae)

Gotoh

Fujiwara

Kitashima

2011

International Journal of Acarology

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Occurrence of the spider mite Tetranychus takafujii Ehara & Ohashi in Kyushu and Okinawa.

Cited by 5 publications

References 7 publications

Non-crop host plants of Tetranychus spider mites (Acari: Tetranychidae) in the field in Okinawa, Japan: Determination of possible sources of pest species and inference on the cause of peculiar mite fauna on crops

Non-crop host plants of Tetranychus spider mites (Acari: Tetranychidae) in the field in Okinawa, Japan: Determination of possible sources of pest species and inference on the cause of peculiar mite fauna on crops

Tetranychusevansi spider mite populations suppress tomato defenses to varying degrees

Susceptibility to acaricides in nine strains of the tomato red spider miteTetranychus evansi(Acari: Tetranychidae)

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